HomeMy WebLinkAbout20110401Vol II 2011 IRP.pdfPACIFICORP Rocky Mountin Power
Pacifc Power
PaclfiCorp Energ
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Interat d sure ~-...~:: .
\lumell.. ppendices
PAC-E-ll-10
March 31., 20.1 1
This 2011 Integrated Resource Plan (IRP) Report is based upon the best available information at
the time of preparation. The IRP action plan wil be implemented as described herein, but is
subject to change as new information becomes available or as circumstances change. It is
PacifCorp's intention to revisit and refresh the IRP action plan no less frequently than annually.
Any refreshed IRP action plan wil be submitted to the State Commissions for their information.
For more information, contact:
PacifCorp
IRP Resource Planning
825 NE. Multnomah, Suite 600
Portland, Oregon 97232
(503) 813-5245
irp(iacfficorp. com
http://wvvw.pacificorp.com
This report is printed on recycled paper
Cover Photos (Left to Right):
Wind: McFadden Ridge I
Thermal-Gas: Lake Side Power Plant
Hydroelectric: Lemolo 1 on North Umpqua River
Transmission: Distribution Transformers
Solar: Salt Palaee Convention Center Photovoltaic Solar Project
Wind Turbine: Dunlap I Wind Project
PACIFiCORP-2011 IRP TABLE OF CONTENTS
TABLE OF CONTENTS
TABLE OF CONTENTS............................................................................................................................................1
INDEX OF TABLES.............................................................................................................................................. IV
INDEX OF FIGURES .............................................................................................................................................. VI
APPENDIX A - LOAD FORECAST DETAILS .....................................................................................................1
INTRODUCTION ........................................................................................................................................................1
Load Forecast. ....... ...... ......... ...... ... ....... ..... ...... ....... ..... ......... .... ..... ...... ....... ......... ..... .... ... .... ....... ............. ..... .......1
METHODOLOGY OVERVIEW ....................................................................................................................................1
Class 2 Demand-side Management Resourees in the Load Forecast ..................................................................3
Modeling overview .... ...... .... .... ..... .... ....... .... ....... .... ... .... .... .............. ...... ....... .... ..... .... ....... .... ....... ............. ..... ....... 3
SALES FORECAST AT THE CUSTOMER METER........................................................................................................5
State Summaries.. ... .... ....... .... ..... .... ....... ..... .... ....... .... ... .... ....... .... ......... ..... ....... .... ..... ...... ..... ....... ............. ....... .....5
Oregon..............................................................................................................................................................................5
Washington .......................................................................................................................................................................6
California .......... .... ........ .......... .... ..... ...... .... ...... .... ............ ...... .... .... .... ...... ...... ...... ....... .......... ....... .... .... ........ ........ .... .... ..... 7
Utah ..................................................................................................................................................................................8
Idaho.................................................................................................................................................................................9
Wyoming..........................................................................................................................................................................9
LOAD FORECAST AT THE GENERATOR ................................................................................................................10
Energy Forecast.................................................................................................................................................10
Jurisdictional Peak Load Forecast ....................................................................................................................11
System-Wide Coincident Peak Load Forecast ............................;...................................................................... II
ALTERNATIVE LOAD FORECAST SCENARIOS........................................................................................................13
APPENDIX B - IR REGULATORY COMPLIACE .......................................................................................15
INTRODUCTION .....................................................................................................................................................15
GENERAL COMPLIACE ........................................................................................................................................15
California ..... ......... ......... .... ....... .... ......... ..... ....... .... ....... .... .... ..... ..... ....... ...... ..... .... ..... ...... ...... ....... ......... ........... .16
Idaho..................................................................................................................................................................16
Oregon...............................................................................................................................................................17
Utah ...................................................................................................................................................................17
Washington ........................................................................................................................................................17
Wyoming............................................................................................................................................................18
APPENDIX C - ENERGY GATEWAY SCENARO PORTFOLIOS.................................................................47
TRASMISSION SCENARIO ANALYSIS AND COST DETAIS..................................................................................47
SYSTEM OPTIMIZER PORTFOLIO TABLES.............................................................................................................52
APPENDIX D - SYSTEM OPTIMIZER DETAILED MODELING RESULTS................................................89
PORTFOLIO CASE BUILD T ABLES.........................................................................................................................93
ANNUAL CARON DIOXIDE EMISSION TRENDS .................................................................................................132
APPENDIX E - STOCHASTIC PRODUCTION COST SIMULATION RESULTS.......................................133
CORE CASE STUDY STOCHASTIC RESULTS.........................................................................................................133
Mean versus Upper-tail Mean PVRR Scatter-plot Charts ...............................................................................133
COAL PLANT UTILIZATION SENSITIVITY AND LOAD FORECAST SCENARO STOCHASTIC STUDY RESULTS ...144
PORTFOLIO PVR COST COMPONENT COMPARISON ......................................................................................146
Core Case Portfolios........................................................................................................................................146
APPENDIX F - THE PUBLIC INPUT PROCESS ..............................................................................................153
PARTICIPANT LIST .............................................................................................................................................153
1
P ACIFICORP - 20 11 INTEGRATED RESOURCE PLAN TABLE OF CONTENTS
Commissions ....................................................................................................................................................153
Intervenors................................................................................................................................ ...................... .154
Others...............................................................................................................................................................155
PUBLIC INPUT MEETINGS ....................................................................................................................................155
General Meetings.............................................................................................................................................155
April 28, 2010 ............................................................................................................................................................... 155
August 4, 2010..............................................................................................................................................................155
October 5,.2010.............................................................................................................................................................155
Decembet 15, 2010....................................................................................................................................................... 156
January 27, 2011........................................................................................................................................................... 156
Januar 31, 2011 ........................................................................................................................................................... 156
February 23,201 1 ......................................................................................................................................................... 156
March 23, 2011 ............................................................................................................................................................. 156
State Meetings. ..... ....... ............. ..... ............... ....... ......... ....................... ...... ....... ....... .... ....... ...... ..... ............ .......156
June 16,2010 - Oregon / California .............................................................................................................................156
June 29, 2010 - Uta .................................................................................................................................................... 156
July 28, 2010 - Idaho.................................................................................................................................................... 157
August 11,2010 - Wyoming ........................................................................................................................................157
PARG LOT ISSUES...........................................................................................................................................158
PUBLIC REVIW OF IRP DRA DOCUMENT ......................................................................................................158
CONTACT INFORMTION .....................................................................................................................................158
APPENDIX G - HEDGING STRATEGY ............................................................................................................161
INTRODUCTION ....................................................................................................................................................161
ÌlEDGING ....................................................................................................................:.........................................161
Purpose of Hedging .........................................................................................................................................161
Needfor Hedging.............................................................................................................................................161
Impact of Hedging and Hedging Costs.... ...................... .................. ......... ....... ............. ......... ....... ........... ..... ...162
Hedge Products................................................................................................................................................163
No "Best" Hedging Strategy......................................................................... ...................................................163
SAMPLE PORTFOLIO SIMULATIONS ....................................................................................................................164
RESULTS ...............................................................................................................................................................164
CONCLUSION ........................................................................................................................................................169
APPENDIX H - WESTERN RESOURCE ADEQUACY EVALUATION........................................................171
INTRODUCTION ....................................................................................................................................................171
WESTERN ELECTRICITY COORDINATING COUNCIL RESOURCE ADEQUACY ASSESSMENT .............................171
PACIFIC NORTHWEST RESOURCE ADEQUACY FORUM'S ADEQUACY ASSESSMENT ........................................177
MART RELIANCE STRESS TEST .......................................................................................................................177
Market Stress Test Design................................................................................................................................177
Stress Test Results ............................................................................................................................................178
CUSTOMER VERSUS SHARHOLDER RISK ALLOCATION ....................................................................................179
APPENDIX I - WIND INTEGRATION STUDy...............................................................................................181
2010 WIND INTEGRATION RESOURCE STUDy....................................................................................................183
1. EXECUTIVE SUMY ..............................................................................................................................183
2. DATA COLLECTION ..................................................................................................................................185
2.3.1 Overview of the Wind Generation Data Used in the Analysis ................................................................186
2.3.2 Historical Wind Generation Data ...........................................................................................................186
2.4.1 Categorization of Historical Wind Data to Determine Simulation Scope............................................... 189
2.4.2 Simulation Process..................................................................................................................................190
3. METHODOLOGy........................................................................................................................................192
4. RESULTS.....................................................................................................................................................209
ApPENDIX A..........................................................................................................................................................217
Simulation of Wind Generation Data... .... ..... ....... .... ... .... ... ..... ...,.. ..... ......... .... ... ....... ...... ..... ....... .... ... .... ..... .... .217
A.1 Detailed Discussion of Statistical Patterns of the Historical Wind Output Data ......................................217
A.2 Time Pattern of the Historical Wind Data.................................................................................................219
11
PACIFICORP - 2011 IRP TABLE OF CONTENTS
A.3 Data Clean-up and Verifcation ................................................................................................................222
A.4 Wind Data Simulation Methodology..................,.......................................................................................224
A.4.1 General Description.............................................................................................................................................224
AA.2 Wind Generation Estimation Model Specification.............................................................................................. 224
AA.3 Wind Generation Estimation Model for Constrined Output .............................................................................. 225
AAA Using NREL's Wind Data to Faciltate Wind Simulation for Sites without Historical Information ................... 226
AA.5 Pairing of Wind Profiles Used for Regression .................................................................................................... 228
A.4.6 Regression Analysis ............................................................................................................................................230
AA.7 Estimate Mean Values of the Predicted............................................................................................................... 230
AA.8 Calculating the Regression Residuals.................................................................................................................. 231
AA.9 Sample of Residuals According to Simulated Output Ranges............................................................................. 232
AA.1O Application of a Non-Linear 3-Step Median Smoother to the Sampled Residuals............................................ 233
ApPENDIX B..........................................................................................................................................................234
Regression Coeffcients and Relative Signifcanee ..........................................................................................234
ApPENDIX C..........................................................................................................................................................241
Operating Reserve Demand Seasonal Detail...................................................................................................241
APPENDIX J - STOCHASTIC LOSS OF LOAD STUDY .................................................................................245
INTRODUCTION ....................................................................................................................................................245
Loss OF LOAD PROBABILITY METRICS ..............................................................................................................245
SIMULATION PERIOD ...........................................................................................................................................246
MODELING ApPROACH OVERVIW .....................................................................................................................246
PLANING RESERVE MARGIN BUILD-UP ............................................................................................................246
MONTE CARLO PRODUCTION COST SIMULATION..............................................................................................248
MODELING OPERATING RESERVES.....................................................................................................................251"
STUDY RESULTS ...................................................................................................................................................252
SELECTION OF A LOLP R1LIAILITY TARGET .....................................................................................254
CAPACITY PLANNING RESERVE MARGIN DETERMINATION ..............................................................................255
CONCLUSION ........................................................................................................................................................255
APPENDIX K - HYROELECTRIC CAPACITY ACCOUNTING ................................................................257
INTRODUCTION ....................................................................................................................................................257
ELIGmLE SUSTAIED PEAKNG HYDRO FACILITIES..........................................................................................257
Sustained Hydro Peaking Capabilty for Lewis River Facilties......................................................................258
ApPLICABILITY OF AN 18-HOUR SUSTAIED PEAKG CAPABILITY STANDAR FOR PACIFCORP .................259
CONCLUSION .......................................................................................................................................................259
APPENDIX L - PLANT WATER CONSUMPTION .....................................................................................;....261
iii
P ACIFICORP - 2011 IR INDEX OF TABLES
INDEX OF TABLES
TABLE A,1 - SYSTEM ANAL SALES FORECAST (IN GIGAWATT-HOUR) 2011 THROUGH 2020...................................1
TABLE A.2 - FORECASTED SALES GROWTH IN OREGON ................................................................................................6
TABLE A.3 - FORECASTED SALES GROWTH IN WASHINGTON........................................................................................6
TABLE A.4 - FORECASTED RETAIL SALES GROWTH IN CALIFORNIA.............................................................................. 7
TABLE A.5 - FORECASTED RETAIL SALES GROWTH IN UTAH ........................................................................................8
TABLEA.6 -FORECASTED RETAIL SALES GROWT IN IDAHO.......................................................................................9
TABLE A.7 - FORECASTED RETAIL SALES GROWTH IN WyOMING...............................................................................1 0
TABLE A.8 - FORECASTED AVERAGE ANAL ENERGY GROWTH RATES FOR LOAD ............................................ ......11
TABLE A.9 - ANAL LOAD FORECASTED (IN MEGAWATT-HOUR) 2011 THOUGH 2020 .................................... ......11
TABLE A.lO - FORECASTED COINCIDENTAL PEAK LOAD GROWT RATES .................................... ........... ...................12
TABLE A.ll - FORECASTED COINCIDENAL PEAK LOAD IN MEGA WA TI.................... ........ ...................................... .12
TABLE B.l - INTEGRATED RESOURCE PLANING STANDARS AN GUIDELINS SUMMAY BY STATE ..................... .19
TABLE B.2 - HANDLING OF 2008 IR ACKNOWLEDGEMENT AND OTHER IR REQUIREMENTS ..... ....... ............. ..........23
TABLE B.3 - OREGON PUBLIC UTILITY COMMISSION IR STANDAR AND GUIDELINS .............................................31
TABLE B.4 - UTAH PuLIC SERVICE COMMISSIONIR STANDAR AND GUIDELINS .................................................38
TABLE B.5 - WASHINGTON UTILITIES AN TRASPORTATION COMMISSION IRP STANARD AND GUIDELINES (WAC
480-1 00-238)......................................................................................................................................................43
TABLE B.6 - WYOMING PUBLIC SERVICE COMMISSION IRP STANAR AND GUIDELINS (DOCKET 90000-107 -XO-
09)......................................................................................................................................................................46
TABLE C.l - TRSMISSION COST DETAILS, GREEN RESOURCE Fu ....................................................................50
TABLE C.2 - TRSMISSION COST DETAILS, INCUMBENT RESOURCE Fu ................. ......... ........... .... ...................51
TABLE C.3 - ENERGY GATEWAY SCENARO DEVELOPMENT TABLE ......................................................... ...................53
TABLE C.4 - ENERGY GATEWAY SCENARO PVR RESULTS ........................................................ ..............................54
TABLE C.5 - ENERGY GATEWAY SCENARO PORTFOLIO RESULTS...............................................................................56
TABLE C.4 - ENERGY GATEWAY SCENARO EVALUATION RESULTS (W STUIES) ........................ ....... ................... 72
TABLE D.l - RESOURCE NAME AN DESCRITION ............................... ............................. ......... ..................................90
TABLE D.2 - TOTAL PORTFOLIO CUMATIVE CAPACITY ADDITIONS BY CASE AN RESOURCE TYE, 2011 - 2030..94
TABLE D.3 - CORE CASE SYSTEM OPTIMIZER PVR RESULTS ..................................................... ..............................95
TABLED.4-CORECASEPORTFOLIOS(CASE 1 TO 14) ................................................................................................96
TABLE D.5 - HA CAP C02 POLICY CORE CASE (15 TO 18)....................................................................................111
TABLE D.6 - 2011 BusINSS lO-YEAR PLAN CASE STUY 19....................................................................................115
TABLE D. 7 _ PORTFOLIO DEVELOPMENT ASSUMTIONS AN SYSTEM OPTIMIZER PVR RESULTS FOR SENSITVITY
CASES (20 TO 33) ..............................................................................................................................................116
TABLE D.8 - COAL PLAN UTILIZATION SENSITITY CASES (20 TO 24) ...................................................................117
TABLE D.9 - LOAD FORECAST SENSITIIT CASES (25 TO 27) ..................................................................................122
TABLE D.lO - RENEWABLE RESOURCE SENSITVIT CASES (28 TO 30A)...................................................................125
TABLE D.ll - DEMAND-SIDE MAAGEMENT SENSITVITY CASES (31 TO 33) ...........................................................129
TABLE E.l- STOCHASTIC MEAN PVR BY CO2 TAX LEVEL, CORE CASE PORTFOLIOS...... ......... ..............................138
TABLE E.2 - STOCHASTIC RISK RESULTS BY CO2 TAX LEVEL, CORE CASE PORTFOLIOS ..........................................138
TABLE E.3 - CARBON DIOXIDE AN OTHER POLLUTANT EMISSIONS...................................................... .................. .140
TABLE E.4- CUMULATIV 10-YEAR CUSTOMER RATE IMPACT, CORE CASE PORTFOLIOS ........................................140
TABLE E.5 - Loss OF LOAD PROBABILITY FOR A MAJOR (:; 25,000 MWH) JULY EVENT, CORE CASE PORTFOLIOS ..142
TABLE E.6 - AVERAGE Loss OF LOAD PROBABILITY DURIG SUMMER PEAK ....................................... ............. ......143
TABLE E. 7 - STOCHASTIC MEAN PVR BY CO2 TAX LEVEL, SENSITIVITY PORTFOLIOS ..........................................144
TABLE E.8 - STOCHASTIC RISK RESULTS BY CO2 TAX LEVEL, SENSITVITY PORTFOLIOS .................. .......................144
TABLE E.9 - CORE CASES 1 THROUGH 8, PORTFOLIO PVR COST COMPONENTS ($19 CO2 TAX LEVEL) ....... ..... .....146
TABLE E.1 0 - CORE CASES 9 THROUGH 16, PORTFOLIO PVR COST COMPONENTS ($19 CO2 TAX LEVEL) ... ..........147
TABLE E.ll - CORE CASES 17 THROUGH 19, PORTFOLIO PVR COST COMPONETS ($19 CO2 TAX LEVEL) ...........148
TABLE E.12 - COAL PLANT UTILIZATION SENSITVITY AND LOAD FORECAST SCENARO ($19 CO2 TAX LEVEL) .....149
TABLE E.1 3 - COAL PLANT UTILIZATION SENSITIVITY AN LOAD FORECAST SCENARIO ($0 CO2 TAX LEVEL) .......150
TABLE E.1 4 - COAL PLAN UTILIZATION SENSITIVIT AN LOAD FORECAST SCENARIO ($12 CO2 TAX LEVEL) .....151
TABLE G.l - COMPARISON OF MULTIPLE SAMPLE PORTFOLIOS ....................................... .................... .....................165
iv
PACIFiCORP-2011 IR INDEX OF TABLES
TABLE H.l - PEAKG RESOURCE MEGAWATT CAPACITY REQUIMENTS AN FIXD COSTS .................................178
TABLE H.2 - STOCHASTIC PVR DETAILS FOR STRESS TEST AND BASE PORTFOLIO SIMLATIONS .........................179
TABLE 1. ANAL AVERAGE OPERATING RESERVE DEMAN BY PENETRATION SCENARO. ........................................183
TABLE 2. ANAL AVERAGE OPERATIG RESERVE DEMAND INCREMENTAL TO THE LOAD ONLY SCENARO.............. 183
TABLE 3. WIN INTEGRATION COSTS PER MWH OF WI GENERA TED AS COMPARD TO THOSE IN THE 2008 IR ....184
TABLE 4. STATISTICAL PROPERTIES OF WI SITE CAPACITY FACTOR DATA. .............................................................188
TABLE 5. HOURLY CORRLATION OF SYSTEM WIN AND SYSTEM LOAD. ...................................................................188
TABLE 6. COMPARSON OF OPERATING RESERVE DEMAND CALCULATED FROM ACTUAL WI GENERATION PLANT
DATA AND SIMUATED WI GENRATION PLAN DATA ESTIMATED USING A LEAST SQUARS REGRESSION AND
APPLYING DIFFERENT SCALING OF ERRORS ADDED BACK INO THE RAW PREDICTION....................................... 190
TABLE 7. WIN PENETRATION SCENARIOS USED IN PAR AS A PERCENTAGE OF TOTALFLEETCAPACIT...................202
TABLE 8. WIN INGRATION COST SIMULATIONS IN PAR.........................................................................................203
TABLE 9. ALLOCATION OF OPERATING RESERVE DEMAN TO REGULATION, SPINING AN NON-SPING RESERVE
CATEGORIES IN PAR................. ............... ..... ........................ ............... .............. .................... .... ................... .....205
TABLE 10. RESERVE SERVICE CAPABILITY OF EACH GENERATING UNIT IN PAR. ........................................................206
TABLE 11. ANAL AVERAGE OPERATING RESERVE DEMAND BY PENETRTION SCENARO.......................................209
TABLE 12. PAR SIMULATION RESULTS FOR THE LOAD ONLY SCENARO AND THE 425 MW WI PENETRTION
SCENARIO..........................................................................................................................................................214
TABLE 13. PAR SIMUATION RESULTS FOR THE 1,372 MW AND 1,833 MWWIDPENETRATION SCENARIOS............215
TABLE 14. WIND INTEGRATION COST COMPARSON TO THE 2008 IR........................................................................216
TABLE lA. SUMMARY OF WI PLAN START DATES AN NAMEPLATE CAPACITY. ...................................................223
TABLE 2A. NRL PROXIES SELECTED FOR PERTINT P ACIFICORP PLANS. ..................... .......................................227
TABLE 3A. PAIRS OF WIN PROJECTS USED IN DATA SIMUATION. ............................. ................................................229
TABLE 4A. PREDICTIVE CAPACITY FACTOR COEFFICIENTS FOR THE SIMUATION OF GOODNOE HILLS WI
GENERATION USING LEANING JUNIPER ACTUAL GENERATION DATA. ................................................................230
TABLE 1.1- RESOURCE CAPACITY ADDITIONS NEEDED TO REACH PRM TARGET LEVELS .......................................247
TABLE K.l - PEAKIG CAPABILITY COMPARISON FOR LEWIS RIR HYDRO FACILITIES.......... ..... ...................... .....258
TABLE L.l ~ PLANT WATER CONSUMPTION WITH ACRE-FEET PER YEAR.. ...................... ................................... ......262
TABLE L.2 - PLAN WATER CONSUMPTION BY STATE ...................................... ........................................................263
TABLE L.3 - PLAN WATER CONSUMPTION BY FUEL TYPE .......................................................................................263
TABLE LA - PLAN WATER CONSUMPTION FOR PLANTS LOCATED IN THE UPPER COLORADO RIER BASIN ...........264
V
PACIFiCORP-2011 IR INDEX OF TABLES
INDEX OF FIGURES
FIGURE A.l- LOAD FORECAST SCENAROS FOR Low, MEDIU, HIGH AN PEAK ......................................................14
FIGURE A.2 - COINCIDENT PEAK LOAD FORECAST COMPARISON TO PAST IRs ................................. ........................14
FIGURE C.l - WESTERN RENEWABLE ENERGY ZONES PLUS ENERGY GATEWAY SCENARO 1.......... ........ ...................48
FIGURE D.l - CORE CASES: CO2 EMISSION PROFILE FOR MEDIU CO2 TAX COSTS .................................................132
FIGURE E.l - STOCHASTIC COST VERSUS UPPER-TAIL RISK, ZERO CO2 TAX SCENARIO ...................... ..... ................134
FIGUR E.2 - STOCHASTIC COST VERSUS UPPER-TAIL RISK, MEDIU CO2 TAX SCENARIO ............. .........................135
FIGURE E.3 - STOCHASTIC COST VERSUS UPPER-TAIL RISK, Low TO VERY HIGH CO2 TAX SCENARIO ................. ...136
FIGURE E.4 - STOCHASTIC COST VERSUS UPPER-TAIL RISK, AVERAGE FOR CO2 TAX SCENARos............................137
FIGUR E.5 - AVERAGE ANNAL ENERGY NOT SERVED (2011 - 2030), $19 CO2 CORE CASE PORTFOLIOS .............141
FIGURE G.l- PACIFICORP'S ANAL ELECTRCITY AN NATU GAS HEDGING COSTS .......................................162
FIGURE G.2 - REFERENCE PORTFOLIO VERSUS LESS HEGED PORTFOLIO................................................................. 166
FIGURE G.3 - REFERENCE PORTFOLIO VERSUS MORE HEDGED PORTFOLIO............................................................... 167
FIGUR G.4 - REFERENCE PORTFOLIO VERSUS HEDGING ONLY NATUL GAS ........................................................168
FIGURE G.5 - REFERENCE PORTFOLIO VERSUS HEDGING ONLY ELECTRICITY ...........................................................169
FIGURE H.l - WECC FORECASTED POWER SUPPLY MAGINS ............................................. ............................... ......172
FIGURE H.2 - BASIN FORECASTED POWER SUPPLY MAGINs.................................. ............................... ......... ..........173
FIGURE H.3 -BASIN FORECASTED POWER SUPPLY MAGINS WI SELECTED CAPACITY ADDITIONS ......................174
FIGURE H.4 - DESERT SOUTHWEST FORECASTED POWER SUPPLY MAGINs............................................................. 175
FIGUR H.5 - ROCKIES FORECASTED POWER SUPPLY MAGINS ...............................................................................176
FIGURE H.6 - FRONT OFFICE TRASACTION MAT PRICE COMPARSON............................................................... 178
FIGUR 1. RAw HISTORICAL WIN PRODUCTION AN LOAD DATA INORY. ...................................... ...................185
FIGURE 2. MA OF PACIFICORP WI GENERATIG STATIONS USED IN THIS STIY .............................................. .....187
FIGURE 3. CA TEGORIZA TION OF WI GENRATION DATA. ...............................................;............................ ............190
FIGURE 4. SAMPLE OF INNDED SCHEDULE TE-MIN LOAD ESTIMATE AN OBSERVED SYSTEM LOAD................ 194
FIGUR 5. VARBILIT BETWEN THE LIN OF INNDED SCHEDULE AN OBSERVED LOAD WITH ERRORS
HIGHLIGHTED BY GREEN AROWS. ..................................................... ........... ........................................ ............195
FIGURE 6. INDEPENDENT FORECAST ERRORS IN TEN-MIN INTERVAL LOAD AN WIND GENERATION (DECEMBER
2008, APPROXIMATELY 890 MW OF WI PENETRTION). ...............................................................................196
FIGUR 7. WIND REGULATION ERRORS PLOTTD FOR THE MAYS OF THE INITIA TERM AT THE 1,372 MW WIN
CAPACITY PENETRTION LEVEL. ..... .................... .......................................... ........... ....... ..................................197
FIGURE 8. LOAD REGULATION ERRORS PLOTTED FOR THE MAYS OF THE INITIAL TERM. .. .................... ......... ............197
FIGUR 9. EXAMPLE OF BIN ANALYSIS FOR LOAD FOLLOWIG RESERVE SERVICE FROM LOAD VARIABILITY IN THE
WEST BALANCING AUTORITY ARA (MY 2007-2009).................................................................................199
FIGURE 10. EXAPLE OF BIN ANALYSIS FOR LOAD FOLLOWIG RESERVE SERVICE FROM LOAD VARILITY IN THE
EAST BALANCING AUTORITY ARA (MY 2007-2009)..................................................................................199
FIGURE 11. EXAPLE OF BIN ANALYSIS FOR LOAD FOLLOWIG RESERVE SERVICE FROM WI VARILITY AT THE
1,372 MW PENETRATION LEVEL FOR THE WEST BALANCING AUTORITY ARA (MAY 2007-2009). ........ ......200
FIGUR 12. EXAMPLE OF BIN ANALYSIS FOR LOAD FOLLOWING RESERVE SERVICE FROM WID VARBILITY AT THE
1,372 MW PENETRATION LEVEL FOR THE EAST BALANCING AUTORITY AREA (MAY 2007-2009). ...............200
FIGUR 13. PAR TRASMISSION TOPOLOGY. .............................................................................................................208
FIGUR 14. LOAD FOLLOWIG UP OPERATING RESERVE SERVICE DEMAND IN THE WEST BALANCING AUTHORIY
ARA. ...............................................................................................................................................................210
FIGURE 15. LOAD FOLLOWING DOWN OPERATING RESERVE SERVICE DEMAD IN THE WEST BALANCING AUTHORIY
ARA. ...............................................................................................................................................................210
FIGURE 16. REGULATION UP OPERATING RESERVE SERVICE DEMAN IN THE WEST BALANCING AUTHORITY ARA. 211
FIGURE 17. REGULATION DOWN OPERATING RESERVE SERVICE DEMAN IN THE WEST BALANCING AUTHORITY ARA.
.........................................................................................................................................................................211
FIGURE 18. LOAD FOLLOWIG UP OPERATIG RESERVE SERVICE DEMA IN THE EAST BALANCING AUTHORITY
ARA. ...............................................................................................................................................................212
FIGURE 19. LOAD FOLLOWIG DOWN OPERATING RESERVE SERVICE DEMAND IN THE EAST BALANCING AUTHORITY
ARA. ...............................................................................................................................................................212
FIGUR 20. REGULATION UP OPERATING RESERVE SERVICE DEMAN IN THE EAST BALANCING AUTHORITY ARA. .213
VI
PACIFiCORP-2011 IRP INDEX OF TABLES
FIGUR 21. REGULATION DOWN OPERATING RESERVE SERVICE DEMAN IN THE EAST BALANCING AUTHORI ARA.
.........................................................................................................................................................................213
FIGUR lA. LEANING JUNIPER 2009 MONTLY CAPACITY FACTORS. .........................................................................217
FIGUR 2A. COMPARSON OF LEANG JUNIPER AND COMBIN HILLS CAPACITY FACTORS................ .......................218
FIGUR 3A. DAILY GENERATION PATTERNS OF SEVERA PACIFICORP WID PLANTS. ................................................218
FIGUR 4A. DISTRIBUTION OF OBSERVED 2009 HOURY CAPACITY FACTORS AT LEANING JUNIPER..........................219
FIGUR 5A. DISTRIBUTION OF OBSERVED 2009 HOURY CAPACITY FACTORS AT COMBINE HILLS.............................219
FIGUR 6A. AUTOCORRLATION COEFFICIENTS FOR SUCCESSIV TEN MINE LAGS IN CAPACITY FACTOR FOR
LEANING JUNIPER. ....................................................... .......................... ................................. ................ ..........220
FIGUR 7 A. AUTOCORRLATION COEFFICIENTS FOR SUCCESSIVE TEN MINE LAGS IN CAPACITY FACTOR FOR
COMBINE HILLS. ... ........... ...... ................................................................... .... .... ............................. ...................221
FIGUR 8A. PARTIA AUTOCORRLATION COEFFICIENTS FOR LAGS IN CAPACITY FACTOR FOR LEANING JUNIPER.....221
FIGUR 9A. PARTIAL AUTOCORRLATION COEFFICIENTS FOR LAGS IN CAPACITY FACTOR FOR COMBIN HILLS. ......222
FIGURE 10A. WIN GENERATION DATA DEVELOPMENT FLOW CHART. .......................... ...... ...................... .................229
FIGURE llA. COMPARSON OF ACTUAL GOODNOE HILLS CAPACITY FACTORS WITH PREDICTED MEAN GOODNOE HILLS
CAPACITY FACTORS DERID OFF OF LEANING JUNIPER GENERATION DATA. ...................................................231
FIGUR 12A. HIGHLY NON-NORMAL RESIDUALS FROM BIN 5 OF THE MARCH REGRESSION OF GOODNOE HILLS
CAPACITY FACTOR DERIVED FROM OBSERVED LEANG JUNIPER DATA. ..........................................................232
FIGUR 13A. HIGHLY NON-NORMAL RESIDUALS FROM BIN 7 OF THE MACH RERESSION OF GOODNOE HILLS
CAPACITY FACTOR DERED FROM OBSERVED LEANING JUNIPER DATA. ..........................................................232
FIGUR J. - EXISTING RESOURCES, LOADS & SALES, AND RESOURCES WITH RESERVE REQUIMENTS .................248
FIGURE 1.2 - UTAH NORTH LOAD ARA ....................................................................................................................249
FIGURE J.3 - UTAH SOUT LOAD ARA.....................................................................................................................249
FIGUR J.4 - WALLA WALLA, WASHINGTON LOAD ARA .... ...................... ................................... ............................249
FIGUR 1.5 - WEST MAIN (OREGON, NORTHERN CALIFORNIA) LOAD ARA .............................................................250
FIGUR 1.6- YAKMA LOAD ARA ............................................................................................................................250
FIGUR 1. 7 - GOSHEN IDAHO LOAD ARA .................................................................................................................250
FIGURE J.8 - NORTHEAST WYOMING LOAD ARA .....................................................................................................251
FIGURE 1.9 - SOUTHWEST WYOMING LOAD ARA ............................. ....... ............. ............... ....... ..............................251
FIGURE J.1O - SYSTEM LOLH BY PLANING RESERVE MAGIN LEVEL ....................................................................253
FIGUR 1.11 - SYSTEM LOLP INDEX BY PLANNING RESERVE MAGIN LEVEL..........................................................253
FIGUR 1.12 - RELIAILITY RESOURCE FIXED COSTS ASSOCIATED WITH MEETING PRM LEVELS ............................254
FIGUR 1.13 - RELATIONSHIP BETWEEN RESERVE MAGIN AND LOLP .....................................................................255
vii
PACIFiCORP-2011 IRP APPENDIX A -LOAD FORECAST DETAILS
ApPENDIX A - LOAD FORECAST DETAILS
This appendix reviews the load forecast used during the 2011 Integrated Resource Plan and
scenario development for case sensitivities to varing levels in the load forecast. The load
forecasting review starts with the final system level retail sales forecast reflecting the chosen
Class 2 DSM effciencies from the 2011 IRP preferred portfolio. The next section elaborates the
methodology for .long-range load forecasting and provides an overview of the modeling
involved. For the state level summaries, retail sales at the customer meter are discussed at the
state-level reflecting the chosen Class 2 DSM effciencies from the 2011 IRP preferred portfolio.
Finally, the system level and state level load forecast at the generation as used in the 2011 IRP
modeling are discussed.
Load Forecast
Table A.1 shows the final retail sales values at the customer meter for the total system as well as
individual state level after the load reduction impacts of Class 2 DSM programs included in the
2011 IRP preferred portfolio.
Table A.l- System Annual Sales forecast (in Gigawatt-hours) 2011 through 2020
Year Residential Commercial Industrial Irrgation Lightig Other Total
2011 16,272 16,949 20,469 1,285 141 436 55,553
2012 16,522 17,699 20,688 1,301 141 437 56,789
2013 16,454 18,004 21,524 1,302 141 436 57,861
2014 16,567 18,247 22,233 1,302 141 436 58,927
2015 16,715 18,529 22,629 1,302 141 436 59,752
2016 16,896 18,973 23,050 1,302 142 437 60,801
2017 16,953 19,190 23,250 1,302 141 436 61,273
2018 17,078 19,452 23,553 1,302 141 436 61,963
2019 17,215 19,723 23,842 1,302 141 436 62,660
2020 17,335 20,036 24,202 1,303 142 437 63,454
PacifiCorp estimates total load by staring with customer class sales forecasts in each state and
then adds line losses to the customer class forecasts to determine the total load required at the
generators to meet customer demands. Forecasts are based on statistical and econometrc
modeling techniques and customer-specific sales forecast for large customers. These models
1
PACIFiCORP-2011 IR APPENDIX A - LOAD FORECAST DETAILS
incorporate the county and state level forecasts that are provided by public agencies or purchased
from commercial econometrc forecasting services.
The 2010 load forecast was used for the development of the load and resource balance and
portfolio evaluations. Portfolio analysis staed in November 2010 with preliminary load forecast
and continued through December 2010.
In 2008, to improve sales and load forecastig methods, capabilities, and accuracy, several
improvements in the load forecasting approach were identified jointly by the Company and the
Company's consultat, ITRON (a fi specializing in load forecasting softare and services),
and the load forecast methodology was changed to incorporate some improvements. The major
assumption changes drving the forecast improvements were discussed in detail in 2008 IRP.
Those assumptions were revisited and updated as a par of routine forecast development in this
IR. First, load research data was updated to include six years (2004 -2009) of daily data. This
data is used to model the impact of weather on monthly retail sales and peaks by state by class.
The Company collects hourly load data from a sample of customers for each class in each state.
These data are priarily used for rate design, but they also provide an opportity to better
understand usage patterns, paricularly as they relate to changes in temperature. The greater
frequency and data points associated with this daily data make it better suited to captue load
changes drven by changes in temperatue.
Second, in 2008, the time period used to defie normal weather was updated from the National
Oceanic and Atmospheric Admnistration's 30-year period of 1971-2000 to a 20-year time
period - the latest forecast is based on 1990-2009 as the 20 year time period. The Company
identified a trend of. increasing sumer and winter temperatues in the Company's service
terrtory that was not being captúed in the thir year data. ITRON sureys have identified that
many other utilities are also using more recent data for determining normal temperatures. Based
on this review and on the recommendation from ITRON, the Company adopted a 20-year rollng
average as the basis for determining normal temperatues. This better captues the trend of
increasing temperatues observed in both summer and winter.
Third, The Company updated the economic forecasts from IHS Global Insight using the most
recent information available for each of the Company's jursdictions.
Fourth, the historical data period used to develop the monthly retail sales forecasts was updated
to cover January 1997 through July 2010 for all classes except for industral class which goes
back to January 2002. The Company updated the forecast of individual industrial customer usage
based on the best information available as of August 2010.
Fifth, monthly jursdictional peaks were forecasted for each state using a peak model and
estimated with historical data from 1990-2009. As discussed in the 2008 IRP, as an improvement
to the forecasting process, the Company developed a model that relates peak loads to the weather
that generated the peaks. This model allows the Company to better predict monthly and seasonal
peaks. The peak model is discussed in greater detail in the following section.
Sixth, system line losses were updated to reflect actual losses for the 5-years ending December
31, 2009. Prior to 2008, the Company relied on periodic line loss studies. The Company
2
PACIFiCORP-2011 IR APPENDIX A - LOAD FORECAST DETAILS
observed that actual losses were higher than those from the previous line loss study. The use of
actual losses is a reasonable basis for captung total system losses and has been incorporated in
this forecast.
Class 2 Demand-side Management Resources in the Load Forecast
PacifiCorp modeled Class 2 DSM as a resource option to be selected as part of a cost-effective
portfolio resource mix using the Company's capacity expansion optimization model, System
Optiizer. The load forecast used for IRP portfolio development excluded forecasted load
reductions from Class 2 DSM. System Optimizer then determines the amount of Class 2 DSM-
expressed as supply curves that relate incremental DSM quantities with their costs-given the
other resource options and inputs included in the modeL. The use of Class 2 DSM supply cures,
along with the economic screening provided by System Optimizer, determines the cost-effective
mix of Class 2 DSM for a given scenaro. For retail load forecast reporting, PacifiCorp develops
a load forecast reflecting the chosen Class 2 DSM efficiencies from the 2011 IRP preferred
portfolio.
Modeling overview
This section describes the modeling techniques used to develop the load forecast.
The load forecast is developed by forecasting the monthly sales by customer class for each
jurisdiction. The residential, commercial,. irrgation, public street lighting, and sales to public
authority sales forecasts by jurisdiction is developed as a use per customer times the forecasted
number of customers.
The customer forecasts are generally based on a combination of regression analysis and
exponential smoothing techniques using historical data from Januar 1997 to July 2010. For the
residential class, the Company forecasts the number of customers using IRS Global Insight's
forecast of each state's number of households as the major driver. For the commercial class, the
Company develops the forecast for number of customers with the forecasted residential customer
numbers used as the major drver. For irrigation and street lighting classes, the forecast of
number of customers is fairly static and developed using regression models without any
economic drvers.
The residential use-per-customer is forecasted by statistical end-use forecasting techniques. This
approach incorporates end use information (satuation forecasts and efficiency forecasts) but is
estimated using monthly biling data. Satuation trends are based on analysis of the Company's
satuation survey data and effciency trends are based on EIA forecasts that incorporate market
forces as well as changes in appliance and equipment effciency standards. Major drvers of the
statistical end use based residential model are weather-related variables, end-use information
such as equipment shares, satuation levels and efficiency trends, and economic drvers such as
household size, income and energy price. The company updated the residential use-per-
customer-per-day model with appliance satuation and efficiency results released in June 2009.
The SAE models also reflect impacts associated with the Energy Independence and Security Act
of 2007, which mandates strcter efficiency standards for incandescent bulbs begining in 2012.
3
PACIFICORP - 2011 IRP APPENDIX A - LOAD FORECAST DETAILS
The commercial, irgation, street lighting, and sales to public authority use-per-customer
forecast is developed using an econometric modeL. For the commercial class, the Company
forecasts sales per customer using regression analysis techniques with employment used as the
major economic drver in addition to weather-related varables. For other classes, the Company
forecasts sales per customer through regression analysis technques using time trend variables.
The sales forecast for the residential, commercial and irgation classes is the product of the
number of customer forecast and the use-per-customer forecast. However, the development of
the forecast of monthly commercial sales involves an additional step. To reflect the addition of a
large "lumpy" change in sales such as a new data center, monthly commercial sales are increased
based on input from the Customer Account Managers ("CAMs"). Although the scale is much
smaller, the treatment of large commercial additions is similar to the methodology for industrial
sales which is discussed below.
Monthly sales for lighting and public authority are forecasted directly for the class, instead of the
product of the use-per-customer and number of customers. The forecast is developed by class
because the customer sizes in these two classes are more diverse.
The industral sales forecast is developed for each jursdiction using a model which is dependent
on input for the Customer Account Managers (CAMs). The industrial customers are separated
into three categories: existing customers that are tracked by the CAMs, new large customers or
expansions by existing large customers, and industral customers that are not tracked by the
CAMs. Customers are tracked by the CAMs if(l) they have a peak load of five MW or more or
if (2) they have a peak load of one MW or more and have a history of large varations in their
monthly usage. The forecast for the fist two categories is developed through the data gathered
by the CAM assigned to each customer. The account managers have ongoing direct contact with
large customers and are in the best position to know about the customer's plans for changes in
business processes, which might impact their energy consumption.
The Company develops the total industral sales forecast by aggregating the forecast for the three
industral customer categories. The portion of the industrial forecast related to new large
customers and expansion by existing large customers is developed based on direct input of the
customers, forecasted load factors, and the probability of the project occurence. Projected loads
associated with new customers or expansions of existing large customers are categorized into
three groups. Tier 1 customers are those with a signed master electrc service agreement
("MESA") and Tier 2 customers are those with a signed engineering material and procurement
agreement ("EMP A"). When a customer signs a MESA or EMP A, this contractually commits the
Company to provide services under the terms of agreement. Tier 3 includes customers with a
signed engineering services agreement (ESA). This means that customer paid the Company to
perform a study that determines what improvements the Company wil need to make to serve the
requested load. Tier 4 consists of customers who made inquires but have not signed a formal
agreement. Projected loads from customers in each of these tiers are assigned probabilities
depending on project-specific information received from the customer.
Smaller industral customers are more homogeneous and are modeled using regression analysis
with trend and economic variables. Manufactug employment serves as the major economic
drver. The total industrial sales forecast is developed by aggregating the forecast for the three
industral customer categories.
4
PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
The segments are forecasted differently within the industral class because of the diverse makeup
of the customers within the class. In the industrial class, there is no "tyical" customer. Large
customers have very diverse usage patterns and power requirements. It is not unusual for the
entire class to be strongly influenced by the behavior of one customer or a small group of
customers. In contrast, customer classes that are made up of mostly smaller, homogeneous
customers are best forecasted as a use per customer multiplied by number of customers. Those
customer classes are generally composed of many smaller customers that have similar behaviors
and usage patterns. No small group of customers, or single customer, influences the movement
of the entire class. This difference requires the different processes for forecasting.
After monthly energy by customer class is developed, hourly loads are estimated in two steps.
First, PacifiCorp derives monthly and seasonal peak forecasts for each state. The monthly peak
model uses historic peak-producing weather for each state, and incorporates the impact of
weather on peak loads through several weather variables which drve heating and cooling usage.
These weather variables include the average temperatue on the peak day and average. daily
temperatues for two days prior to the peak day. The peak forecast is based on average monthly
historical peak-producing weather for the period 1990-2009.
Second, hourly load forecasts for each state are obtained from the hourly load models using
state-specific hourly load data and daily weather variables. Hourly load forecasts are developed
using a model that incorporates the 20-year average temperatues, the actual weather pattern for
a year, and day-tye variables such as weekends and holidays. The model incorporates both mild
and extreme days in weather patterns by mapping the normal temperatues to an actual weather
pattern. This method effectively represents the daily volatility in weather experienced durg a
tyical year. Also, the method preserves the extreme temperatues and maps them to a year to
produce a more accurate estimate of daily temperatures. The hourly load forecasts are adjusted
for line losses and calibrated to monthly and seasonal peaks. After PacifiCorp develops the
hourly load forecasts for each state, hourly loads are aggregated to the total Company system
leveL. System coincident peaks are then identified as well as the contribution of each jursdiction
to those monthly system peaks.
This section provides total system and state-level forecasted retail sales summaries measured at
the customer meter. The factors influencing the forecasted sales growth rates also influence the
forecasted peak demand growth rates.
State Summaries
Oregon
Table A.2 summarizes Oregon state forecasted retail sales growth by customer class.
5
PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
Table A.2 - Forecasted Sales Growth in Oregon
Year Residential Commercial Industral Irrgation Lighting Other Total
2011 5,624 5,142 2,298 266 38 0 13,368
2012 5,672 5,399 2,324 282 38 0 13,715
2013 5,573 5,490 2,367 283 38 0 13,750
2014 5,563 5,526 2,368 283 38 0 13,778
2015 5,570 5,557 2,355 283 38 0 13,803
2016 5,612 5,603 2,350 283 38 0 13,886
2017 5,610 5,616 2,325 283 38 0 13,872
2018 5,641 5,647 2,310 283 38 0 13,920
2019 5,675 5;677 2,299 283 38 0 13,971
2020 5,705 5,720 2,297 283 38 0 14,043
The forecast of residential sales is expected to grow at a relatively slower rate of 0.2% annually
compared to average annual growt rate of around 1.3% experienced in the past ten years. This
slow down is mainly attbuted to housing market deterioration worsening economic conditions
in the service terrtory. Beyond20l2, use per customer is expected to decline - this decline is
mainly due to the impact of long-term lighting effciency gains resulting from 2007 Federal
Energy legislation and other energy efficiency and conservation programs.
Over the forecast horizon, forecasted commercial class sales are projected to grow anually at
1.2%, and are higher than the ten year average annual growt rate in history. Anual growt rate
is much higher in the near term as a result of new data centers in the service terrtory. Usage per
customer is projected to decline slightly due to increased equipment effciency.
As an aftermath of housing market slowdown and economic recession affecting wood products
and semi-conductor manufactug, forecasted industral class sales are projected to grow at a
very slow rate in the forecast horizon. Continued diversification in the manufactug base in the
state and good export opportities may continue to add to some positive growt in the area.
Washington
Table A.2 summarizes Washington state forecasted retail sales growth by customer class.
Table A.3 - Forecasted Sales Growth in Washington
Year Residential Commercial Industral Irrgation Lighting Other Total
2011 1,639 1,445 843 160 10 0 4,097
2012 1,652 1,471 858 160 10 0 4,150
2013 1,636 1,481 865 160 10 0 4,151
2014 1,638 1,487 866 160 10 0 4,161
2015 1,645 1,493 866 160 10 0 4,174
2016 1,662 1,503 868 160 10 0 4,203
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PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
The forecast of residential sales is expected to grow at a slower average annual growth rate of
0.4% compared to ten year historical growth rates of around 1.4% due to the continuing impact
of housing market slowdown and economic recession. The slight growth in residential class sales
is due to continuing customer growt drven by population growth and household formation in
the service area. Beyond 2012, use per customer is expected to decline - this decline is mainly
due to the impact of long-term lighting efficiency gains resulting from 2007 Federal Energy
legislation and other energy efficiency and conservation programs.
Over the forecast horizon, forecasted commercial class sales are projected to grow at an average
anual rate of 0.5% due to the aftermath of economic recession.
The industrial class sales are projected to grow at an average annual growth rate of 0.3%
reflecting slow recovery in wood products and food processing sectors.
California
Table A.4 summarizes California state forecasted sales growth by customer class.
Table A.4 - Forecasted Retail Sales Growth in California
Year Residential Commercial Industral Irrgation Lighting Other Total
2011 398 288 40 98 2 0 827
2012 402 290 44 98 2 0 836
2013 398 294 45 98 2 0 837
2014 399 297 44 98 2 0 840
2015 401 297 43 98 2 0 842
2016 405 298 42 98 2 0 846
2017 405 298 41 98 2 0 845
2018 407 299 40 98 2 0 847
2019 409 300 39 98 2 0 849
2020 411 302 38 98 2 0 851
The residential sales are expected to grow at an average annual rate of 0.3%. Beyond 2012, use
per customer is expected to decline - this decline is mainly due to the impact of long-term
lighting efficiency gains resulting from 2007 Federal Energy legislation and other energy
effciency and conservation programs.
7
PACIFICORP - 20 lllR APPENDIX A - LOAD FORECAST DETAILS
The continuing population growth also affects sales in the commercial sector though continued
commercial customer growt. However, some of this growt is being offset from increased
equipment effciency over the forecast horion.
Declines over the decade in the lumber and wood product industres production resulted in an
overall decline in the industral sales for the past two years, and is stil facing hardship.
Utah
Table A.5 summarizes Utah state forecasted sales growt by customer class.
Table A.S - Forecasted Retail Sales Growth in Utah
Year Residential Commercial Industral Irgation Lighting Other Total
2011 6,776 8,104 8,377 188 77 436 23,958
2012 6,908 8,508 8,221 187 77 437 24,339
2013 6,943 8,655 8,594 187 77 436 24,893
2014 7,023 8,804 8,873 187 77 436 25,401
2015 7,120 9,005 8,978 187 77 436 25,803
2016 7,206 9,346 9,114 187 77 437 26,368
2017 7,245 9,520 9,185 187 77 436 26,650
2018 7,307 9,711 9,299 187 77 436 27,018
2019 7,374 9,914 9,395 187 77 436 27,384
2020 7,430 10,135 9,513 187 77 437 27,779
Utah continues to see natual population growth that is faster than many of the surounding
states. Durg the historical period, Utah experienced rapid population growth with a high rate of
in-migration. However, the rate of population growth is expected to be relatively lower in the
coming decade as in-migration into the state slows down relative to history. Over the forecast
horizon, residential sales are expected to grow at a slower rate of 1.0% compared to what has
been experienced. historically in the past ten years due to slower in-migration and slow recovery
in housing market in near-term. Beyond 2012, the decline in use per customer is drven by the
impact of long-term lighting effciency gains resulting from 2007 Federal Energy legislation and
other energy effciency and conservation programs.
The continuing population growth also affects sales in the commercial sector by continued
commercial customer growth. Commercial sales are growing at an average annual rate of 2.5%
in the forecast horizon mainly due to several data centers starting services in Utah. However
some of this growth is being slightly offset from equipment efficiency gains over the forecast
horizon.
The industral class in the state is diversified and wil continue to cause sales growth in the
sector. Utah has a strategic location in the western half of the United States, which provides easy
access into many regional markets. The industral base has become more lined to the region and
is less dependent on the natual resource base within the state. This provides a strong foundation
8
PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
for continued growth into the futue. As a result of economic slowdown, over the forecast
horizon, industral sales are growing at a moderate 1.4% as compared to the recent ten year
growth rate of 1.6%, but are lower than the pre recession annual average growt rate. As the
economy recovers, industral expansions in a broad range of industres are expected to pick up,
and industral sales are expected to grow again reflecting improvement in overall economic
conditions. In 2011, the industral sales are higher due to a one year load increase by a large
industral customer.
Idaho
Table A.6 summarizes Idaho state forecasted sales growt by customer class.
Table A.6 - Forecasted Retail Sales Growth in Idaho
Year Residential Commercial Industral Irgation Lighting Other Total
2011 732 432 1,665 550 3 0 3,381
2012 756 450 1,690 550 3 0 3,448
2013 764 467 1,778 550 3 0 3,562
2014 784 484 1,883 550 3 0 3,704
2015 805 499 1,950 550 3 0 3,806
2016 829 512 2,007 550 3 0 3,901
2017 846 522 2,016 550 3 0 .3,937
2018 865 533 2,020 550 3 0 3,972
2019 885 544 2,025 550 3 0 4,007
2020 905 557 2,033 550 3 0 4,048
Over the forecast horizon, the residential sales are projected to grow at 2.4% annually compared
to historical ten year average annual growth rate of 2.8%. Beyond 2012, use per customer is
expected to decline - this decline is mainly due to the impact of long-term lighting efficiency
gains resulting from 2007 Federal Energy legislation and other energy efficiency and
conservation programs.
The growth rate for commercial class sales is expected to continue to be strong due to customer
growth in response to the increasing residential customer growth resulting in increasing service
sector demand such as education and health care servces. Usage per customer growth is
somewhat offset by equipment efficiency gains over the forecast horion.
Industrial sales are expected to grow at an average annual rate of 2.2%. This growth is primarily
due to expansions by a few large industral customers.
Wyoming
Table A. 7 summarizes Wyoming state forecasted sales growth by customer class.
9
PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
Table A.7 - Forecasted Retail Sales Growth in Wyoming
Year Residential Commercial Industral Irgation Lighting Other Total
2011 1,103 1,538 7,246 23 12 0 9,921
2012 1,134 1,581 7,552 23 12 0 10,301
2013 1,141 1,617 7,875 23 12 0 10,668
2014 1,159 1,650 8,199 23 12 0 11,043
2015 1,173 1,678 8,437 23 12 0 11,324
2016 1,182 1,710 8,669 24 12 0 11,596
2017 1,181 1,730 8,818 24 12 0 11,765
2018 1,182 1,753 9,019 24 12 0 11,990
2019 1,186 1,778 9,221 24 12 0 12,220
2020 1,188 1,808 9,457 24 12 0 12,489
Residential sales is expected to grow at an average annual rate of 0.8%, compared to an average
annual growth rate of around 2.4% experienced durng the past ten years. Population growth is
stil expected to continue in the service area, which contrbutes to some of the sales growth.
Beyond 2012, use per customer is expected to decline - this decline is mainly due to the impact
of long-term lighting effciency gains resulting from 2007 Federal Energy legislation and other
energy effciency and conservation programs.
Over the forecast horizon, commercial class sales are projected to grow at an annual growth rate
of 1.8%. Sales growt is drven mainly by the customer growth in response to stil continuing
residential customer growth and the growth of the offce sector.
Wyoming industrial sales growth, drven by expansion in oil and gas extraction industres, is
expected to continue, but at a much reduced rate in the near years due to uncertainty in energy
prices. As the economy recovers, industrial growt continues in outer years. Continuing growth
in industral customers in the service area also contrbutes to the load growth in the residential
and commercial customer sectors.
This section provides the load forecast at the generator information used for 2011 IRP portfolio
modeling for each state and the system as a whole by year for 2011 through 2020 before Class 2
DSM load reductions are applied.
Energy Forecast
Table A.8 shows average annual energy load growth rates for the PacifiCorp system and
individual states. Growth rates are shown for the forecast period 2011 through 2020.
10
PACIFICORP - 2011 IR APPENDIX A - LOAD FORECAST DETAILS
Table A.8 - Forecasted Average Annual Energy Growth Rates for Load
The total net control area load forecast used in this IRP reflects PacifiCorp's forecasts of loads
growing at an average rate of 2.1 % percent annually from year 2011 to 2020. Table A.9 shows
the forecasted load for each specific year for each state served by PacifiCorp and the average
anual growt (AAG) rate over the entire time period.
Table A.9 - Annual Load forecasted (in Megawatt-hours) 2011 through 2020
2011 63,131,207 14,968,933 4,579,565 954,604 26,106,815 10,611,408 3,721,679 2,188,202
2012 64,958,409 15,487,788 4,676,478 969,067 26,746,468 11,040,464 3,804,258 2,233,885
2013 66,388,259 15,669,033 4,703,107 972,280 27,389,581 11,451,701 3,937,679 2,264,877
2014 68,035,127 15,853,824 4,754,379 982,164 28,151,361 11,883,924 4,106,332 2,303,143
2015 69,442,054 16,038,453 4,809,526 991,175 28,805,998 12,220,507 4,234,971 2,341,424
2016 71,110,972 16,283,652 4,880,687 1,002,320 29,650,389 12,548,966 4,357,547 2,387,412
2017 72,151,300 16,419,176 4,921,944 1,009,109 30,196,791 12,770,304 4,415,978 2,417,998
2018 73,424,134 16,602,014 4,977,007 1,018,716 30,840,594 13,055,537 4,473,968 2,456,298
2019 74,713,621 16,789,205 5,030,425 1,028,331 31,491,637 13,346,735 4,532,675 2,494,611
2020 76,136,508 16,998,651 5,089,930 1,039,248 32,188,156 13,680,764 4,598,606 2,541,153
2011-20 2.1%1.4%1.2%0.9%2.4%2.9%2.4%1.7%
2021-30 1.7%0.9%0.9%0.8%1.9%2.5%1.2%1.4%
2011-30 1.9%1.1%1.1%0.9%2.1%2.7%1.8%1.5%
Jurisdictional Peak Load Forecast
The economies, industr mix, appliance and equipment adoption rates, and weather patterns are
different for each jursdiction that PacifiCorp serves. Because of these differences the
jursdictional hourly loads have different daily and hourly patterns. In addition, the growth for
the jursdictional peak demands can be different from the growth in the jurisdictional
contribution to the system peak demand. As explained in the methodology section, development
of the coincident peaks is based on jurisdictional peaks. However, the jursdictional peak forecast
is not directly used in the IRP portfolio development process.
System-Wide Coincident Peak Load Forecast
The system coincident peak load is the maximum load required on the system in any hourly
period. Forecasts of the system peak for each month are prepared based on the load forecast
produced using the methodologies described above. From these hourly forecasted values, the
coincident system peaks and the non-coincident peaks (within each state) during each month are
extracted.
Since 2000, the annual system peak has generally occured in the sumer. The sumer system
peak is a result of several factors. First, the increasing demand for sumer space conditioning in
11
PACIFiCORP-2011 IR APPENDIX A - LOAD FORECAST DETAILS
the residential and commercial classes and a decreasing demand for electrc related space
conditioning in the winter contrbutes to a sumer peak. This trend in space conditioning is
expected to continue. Second, Utah with a sumer peak that is relatively higher than the winter
peak has been growing faster than the system. This growt also contrbuted to a summer peaking
system.
Total system load factor is expected to be relatively stable over the 2011 to 2020 time period.
There are several factors workig in opposite directions, leadig to this result. First, the
relatively high growt in high load factor industral sales, particularly in Wyoming, tends to push
up the system load factor. Second, as discussed above, the shift in space conditioning tends to
push down the system load factor. And, third, advancing lighting efficiency standards, such as
those found in the 2007 Energy Independence and Securty Act, which begin to tae effect in
2012, also tend to push down the system load factor.
Table A.tO - Forecasted Coincidental Peak Load Growth Rates
PacifiCorp's eastern system peak is expected to continue growing faster than the western system
peak, with average annual growth rates of 2.4 percent and 1.4 percent, respectively, over the
forecast horizon. The main drivers for the higher coincident peak load growt for the eastern
states include the following:
· Customer growth in residential and commercial classes
· New large commercial customers such as data centers
· Increased usage by Industral class due to addition of new large industral customers or
expansion by existing customers
Table A.ll below shows that for the same time period the total peak is expected to grow by 2.1
percent.
Table A.ll - Forecasted Coincidental Peak Load in Megawatts
2011 10,449 2,332 775 160 4,840 1,329 679 336
2012 10,716 2,396 813 163 4,935 1,376 691 341
2013 10,960 2,429 802 164 5,074 1,423 721 346
2014 11,252 2,466 817 163 5,231 1,471 750 353
2015 11,501 2,496 830 166 5,354 1,509 787 359
2016 11,740 2,528 843 169 5,474 1,545 817 365
2017 11,960 2,557 855 171 5,602 1,574 831 370
2018 12,194 2,584 893 173 5,726 1,601 842 376
2019 12,378 2,611 880 174 5,845 1,633 854 381
2020 12,607 2,644 894 174 5,975 1,668 864 388
2011-20 2.1%1.4%1.6%0.9%2.4%2.6%2.7%1.6%
2021-30 1.7%0.9%1.3%1.0%2.0%2.3%1.4%1.4%
2011-30 1.9%1.2%1.4%1.0%2.2%2.4%2.0%1.5%
12
PACIFiCORP-2011 IRP APPENDIX A - LOAD FORECAST DETAILS
The main purpose of the alternative load forecast cases is to determine the resource tye and
timing impacts resulting from a strctual change in the economy. The focus of the load growt
scenarios is from 2014 onward. The Company assumes that economic changes begin to
significantly impact loads begining in 2014, the curently planned acquisition date for the next
CCCT resource.
The October 2010 forecast was considered to be the baseline (Medium) scenario. For the high
and low growth scenarios, assumptions from IRS Global Insight were applied to the economic
drivers in the Company's load forecastig models. These growth assumptions were extended for
the entire forecast horizon.
Recognizing the volatility associated with oil and gas extraction industries, PacifiCorp applied
additional assumptions for Utah and Wyoming industral classes for the high scenaro. For 2014
and 2015, industral sales were projected based on historic average growth rates for boom years
(2003-2008), and for 2016 and beyond, industral sales were projected based on historic average
growth rates for 2000-2008 (time period with one economic boom and one recession). For
Oregon, the probability of new loads from data centers is increased, and a steady growt rate
based on the historical average is applied for 2014 onwards for the industrial class.
For the low scenario, the Company assumed a reduced probability of data center growt
materializing. Also, for Utah and Wyoming, a double dip recession starting with slower 2011
and 2012 growth was assumed, accompanied by a recovery track from the double-dip recession
less than complete for the forecast horizon.
For the 1-in-1O year (10% probability) extreme weather scenario, the Company used 1-in-10 year
peak weather for winter (January) and summer (July) months for each state. The 1-in-1O year
peak weather is defined as the year for which the peak has the chance of occurg once in 10
years.
Figue A.1 shows the comparison of the above scenarios relative to the Medium scenario. Figue
A.2 compares the system coincident peak load forecast with those used for the 2008 IRP Update
and 2008 IRP.
13
P ACIFICORP - 2011 IR APPENDIX A - LOAD FORECAST DETAILS
Figure A.l- Load Forecast Scenarios for Low, Medium, High and Peak
14,000
tl"~13,000"""Qj~
12,000
16,000
15,000
11,00
10,000
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
-+Medium ..Low ..High ..Peak
Figure A.2 - Coincident Peak Load Forecast Comparison to Past IRPs
~
~
~....
~
14,500
14,000
13,500
13,000
12,500
12.000
11,500
11,000
10,500 ,
10,000
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
""201 I IRP(October 2010)- -2008IRPUpdate(November2009)"" "' -2008 IRP(November2008)
14
PACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIANCE
ApPENDIX B - IRP REGULATORY COMPLIANCE
This appendix describes how PacifiCorp's 2011 IRP complies with (1) the varous state
commission IRP standards and guidelines, (2) specific analytical requirements stemming from
acknowledgment orders for the Company's last IRP ("2008 IRP"), and (3) state commission IRP
requirements stemming from other regulatory proceedings.
Included in this appendix are the following tables:
. Table B.l - Provides an overview and comparison of the rules in each state for which IRP
submission is required.
1
. Table B.2 - Provides a description of how PacifiCorp addressed the 2008 IRP
acknowledgement requirements and other commission directives.
. Table B.3 - Provides an explanation of how this plan addresses each of the items contained
in the new Oregon IRP guidelines issued in January 2007.
. Table B.4 - Provides an explanation of how this plan addresses each of the items contained
in the Utah Public Service Commission IRP Standard and Guidelines issued in June 1992.
. Table B.5 - Provides an explanation of how this plan addresses each of the items contained
in the Washington Utilities and Trade Commission IRP guidelines issued in January 2006.
. Table B.6 - Provides an explanation of how this plan addresses each of the items contained
in the Wyoming Public Service Commission IRP guidelines.
PacifiCorp prepares the IRP on a biennial basis and fies the IRP with the state commissions.
The preparation of the IRP is done in an open public process with consultation between all
interested parties, including commissioners and commission staff, customers, and other
stakeholders. This open process provides parties with a substantial opportity to contrbute
information and ideas in the planning process, and also serves to inform all paries on the
planning issues and approach. The public input process for this IRP, described in Volume 1,
Chapter 2, as well as in Appendix F, fully complies with the IRP Standards and Guidelines.
The IRP provides a framework and plan for futue actions to ensure PacifiCorp contiues to
provide reliable and least-cost electrc service to its customers. The IRP evaluates, over a twenty-
year planning period, the futue loads of PacifiCorp customers and the capability of existing
resources to meet this load.
i California guidelines exernpt a utility with less than 500,000 custorners in the state from filing an IRP. However,
renewable portfolio stadad rules require that PacifiCorp file 1R supplements that address how the Cornpany is
cornplying with RPS compliance requirements.
15
PACIFICORP - 2011 IR APPENDIX B - IR REGULATORY COMPLIANCE
To fill any gap between changes in loads and existing resources, the IR evaluates all available
resource options, as required by state commssion rules. These resource alternatives include
supply-side, demand-side, and transmission alternatives. The evaluation of the alternatives in the
IRP, as detailed in Chapters 7 and 8 meets ths requirement and includes the impact to system
costs, system operations, supply and transmission reliabilty, and the impacts of vanous nsks,
uncertainties and externality costs that could occur. To perform the analysis and evaluation,
PacifiCorp employs a suite of models that simulate the complex operation of the PacifiCorp
system and its integration within the Western Interconnection. The models allow for a ngorous
testing of a reasonably broad range of commercially feasible resource alternatives available to
PacifiCorp on a consistent and comparble basis. The analytical process, including the risk and
uncertinty analysis, fully complies with IR Stadads and Guidelines, and is descnbed in detail
in Chapter 7.
The IRP analysis is designed to define a resource plan that is least cost, after consideration of
nsks and uncertainties. To test resource alternatives and identify a least..cost, nsk adjusted plan,
portfolio resource options were developed and tested against each other. This testing included
examination of vanous tradeoffs among the portfolios, such as average cost versus nsk,
reliability, customer rate impacts, and average annual C02 emissions. This portfolio analysis and
the results and conclusions drawn from the analysis are described in Chapter 8.
Consistent with the IRP Standads and Guidelines of Oregon, Utah, and Washington, this IRP
includes an Action Plan (See Chapter 9). The Action Plan details near-term actions that are
necessar to ensure PacifiCorp continues to provide reliable and least-cost electric service after
considenng nsk and uncertainty. Chapter 9 also provides a progress report on action items
contained in the 2008 IRP Update Action Plan.
The 2011 IRP and the related Action Plan. are fied with each commission with a request for
prompt acknowledgement. Acknowledgement means that a commission recognizes the IRP as
meeting all regulatory requirements at the time the acknowledgement is made. In the case where
a commission acknowledges the IRP in part or not at all, PacifiCorp works with the commission
to modify and re-fie an IRP that meets acknowledgement stadads.
. State commission acknowledgement orders or letters tyically stress that an acknowledgement
does not indicate approval or endorsement of IRP conclusions or analysis results. Similarly, an
acknowledgement does not imply that favorable ratemaking treatment for resources proposed in
the IRP wil be given.
California
Subsection (i) of California Public Utilities Code, Section 454.5, states that utilities serving less
than 500,000 customers in the state are exempt from filing an Integrated Resource Plan for
California. PacifiCorp serves only 45,072 average customers in the most northern parts of the
state. PacifiCorp filed for and received an exemption on July 10,2003.
Idaho
The Idaho Public Utilities Commission's Order No. 22299, issued in Januar 1989, specifies
integrated resource planing requirements. The Order mandates that PacifiCorp submit a
16
PACIFICORP -2011 IR APPENDIX B - IR REGULATORY COMPLIACE
Resource Management Report (RM) on a biennial basis. The intent of the RMR is to describe
the status ofIR efforts in a concise format, and cover the following areas:
Each utility's RMR should discuss any flexibilties and analyses considered during
comprehensive resource planning, such as: (1) examination of load forecast
uncertainties; (2) effects of known or potential changes to existing resources; (3)
consideration of demand and supply side resource options; and (4) contingencies
for upgrading, optioning and acquiring resources at optimum times (considering
cost, availabilty, lead time, reliabilty, risk, etc.) as future events unfold.
This IRP is submitted to the Idaho PUC as the Resource Management Report for 2007, and fully
addresses the above report components. The IRP also evaluates DSM using a load decrement
approach, as discussed in Chapters 6 and 7. This approach is consistent with using an avoided
cost approach to evaluating DSM as set forth in IPUC Order No. 21249.
Oregon
This IRP is submitted to the Oregon PUC in compliance with its new planning guidelines issued
in January 2007 (Order No. 07-002). These guidelines supersede previous ones, and many codify
analysis requirements outlined in the Commission's acknowledgement order for PacifiCorp's
2004IRP.
The Commission's new IRPguidelines consist of substantive requirements (Guideline 1 ),
procedural requirements (Guideline 2), plan fiing, review, and updates (Guideline 3), plan
components (Guideline 4), transmission (Guideline 5), conservation (Guideline 6), demand
response (Guideline 7), environmental costs (Guideline 8, Order No. 08-339), direct access loads
(Guideline 9), multi-state utilities (Guideline 10), reliabilty (Guideline 11), distrbuted
generation (Guideline 12), and resource acquisition (Guideline 13). Consistent with the earlier
guidelines (Order 89-507), the Commission notes that acknowledgement does not gurantee
favorable ratemaking treatment, only that the plan seems reasonable at the time acknowledgment
is given. Table C.3 provides considerable detail on how this plan addresses each of the
requirements.
Utah
This IRP is submitted to the Utah Public Service Commission in compliance with its 1992 Order
on Standards and Guidelines for Integrated Resource Planing (Docket No. 90-2035-01, "Report
and Order on Standards and Guidelines"). Table CA documents how PacifiCorp complies with
each of these standards.
Washington
This IRP is submitted to the Washington Utilities and Transportation Commission (WUTC) in
compliance with its rule requiring least cost planning (Washington Administrative Code 480-
100-238), and the rule amendment issued on January 9, 2006 (WAC 480-100-238, Docket No.
UE-030311). In addition to a least cost plan, the rule requires provision of a two-year action plan
and a progress report that "relates the new plan to the previously fied plan."
The rule amendment also now requires PacifiCorp to submit a work plan for informal
commssion review not later than 12 months prior to the due date of the plan. The work plan is to
17
PACIFICORP - 2011 IR APPENDIX B - IR REGULATORY COMPLIANCE
layout the contents of the IRP, the resource assessment method, and timing and extent of public
participation. PacifiCorp filed a work plan with the Commission on Februar 21,2006, and had a
follow-up conference call with WUC staff to make sure the work plan met staff expectations.
Finally, the rule amendment now requires PacifiCorp to provide an assessment of transmission
system capabilty and reliabilty. This requirement was met in this IRP by modeling the
company's curent transmission system along with both generation and transmission resource
options as part of its resource portfolio analyses. These analyses used such reliability metrcs as
Loss of Load Probabilty and Energy Not Served to assess the impacts of different resource
combinations on system reliability. The stochastic simulation and risk analysis section of
Chapter 7 reports the reliability analysis results.
Wyoming
In 2008, Wyoming proposed draft rule 253 for any utility serving Wyoming to file their
Integrated Resource Plan with the commission. The rule went into effect in September 2009.
Rule 253: Integrated Resource Planning.
Any utilty serving in Wyoming required to file an integrated resource plan (IRP) in any
jurisdiction, shall file that IRP with the Wyoming Public Service Commission. The
Commission may require any utilty serving in Wyoming to prepare and file an IRP when
the Commission determines it is in the public interest. Commission advisory staff shall
review the IRP as directed by the Commission and report its findings to the Commission
in open meeting. The review may be conducted in accordance with guidelines set from
time to time as conditons warrant.
18
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22
PACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
Table B.2 - Handling of 2008 IRP Acknowledgement and Other IRP Requirements
Acceptace of
Filing, Case No.
PAC-E-09-06, p. 7.
Acceptace of
Filing, Case No.
PAC-E-09-06, p. 8.
- Acceptance of
Filing, Case No.
P AC-E-09-06, p. 8.
Acceptance of
Filing, Case No.
PAC-E-09-06, p. 7.
PUR A QF Wind,
ID PAC-E-07-07, p.
6.
PUR A QF Wind,
ID PAC-E-07-07, p.
6.
Prior to its next IRP filing, Staff requests
that the Cornpany explain and justify why
its integration costs have more than
doubled. Staff further recommends that
the Cornpany perform stochastic
rnodeling to ascertin a value as par of
its next IR.
Staff is concerned that the (portfolio
performance rneasure importce
weights) were chosen arbitrarly and may
ultimately impact the selection of one
portolio over another having equal or
greater rnerit. Staff requests that the
Cornpany correct this discrepancy in
futue planing processes and document
the wei ht deviation in the fial Ian.
Staff does not believe that PacifiCorp has
adequately quatified the cost associated
with meeting an RPS. Staff believes
comparg portfolios with and without
RPS constraints may facilitate
discussions regarding cost allocation and
trading rules forrenewable energy
credits.
Staff recommends that the Company
conduct sensitivity analyses on the choice
of discount rates on resource tirning and
selection. A standard inflation Treasur
bond rate, Staff contends, rnay serve as a
potential lower bound, and the after-tax
W ACC may serve well as an upper
bound.
Expected wind integration cost
information wil be included in the
Cornpany's integrated resource planning
(IR) process in the same way that costs
for other generating resources are
included in the IRP.
(PacifiCorp) shall hereafter file notice
with the Commission of any changes to
its wind integration charge as reflected in
subsequent changes to its IRP.
The Company provided its 2010 wind integration
study to IPUC staffin Septernber 2010. This study,
included as Appendix I, thoroughly describes the
rnethodology used to derive wind integration cost
results. Stochastic modeling is considered
impractical given the modeling technology. For
exarnple, one key methodology step involved
importing unit commitment data from one
production cost ru into another. This step is not
curently possible with multiple stochastic iterations
due to the volume of data bein rocessed.
The Company dropped the numerical weightig
scheme frorn the portolio selection process. See
Chapter 7, "Modeling and Portfolio Evaluation
Approach".
PacifiCorp included a portfolio development
scenaro for which RPS requiements were removed
as resource selection constraints (Case #30). .
Chapter 8 documents the resource and portolio cost
irnpact of removing RPS requirernents (See the
section entitled, "Renewable Portolio Stadard
Impact".
Due to time constraints for preparation of this IR,
PacifiCorp intends to conduct the recommended
sensitivity analysis as par of the 2011 IR Update,
to be filed with the state commissions in 2012.
The wind integration cost information is included in
the 2011 IRP as Appendix i. The Cornpany also
filed the wind integration study as an attachment to
its stipulation commitment compliance fiing under
Order No. 30497, dated February 14,2011.
In its stipulation commitment compliance fiing
under Order No. 30497, the Cornpany did not
request a change to the curent Commission
approved wind integration rate of $6.501M.
23
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
PUR A QF Wind,
ID PAC-E-07-07, p.
7.
Idaho wind developers wil be notified as
part of the public meetig process and
can contrbute their input at those
meetigs to
discuss PacifiCorp s wind integration
study and new data related to wind
integrtion costs pnor to the publishing of
the Corn an s next IR.
PacifiCorp continued to invite Idaho wind
developers to IR public input meetigs.
Information on the 2010 wind integration study and
wind resource modeling in general is posted to the
Company's IR Web site.
Order No. 10-066,
Docket No. LC 47,
p.26.
Order No. 10-066,
Docket No. LC 47,
p.26.
Order No. 10-066,
Docket No. LC 47,
p.26.
Order No. 10-066,
Docket No. LC 47,
p.26.
Action Item 3
(Peaking/ntermediate/Base- load Supply-
side Resources) - In recognition of the
unsettled U.S. econorny, expecte
volatility in natual gas markets, and
regulatory uncertainty, continue to seek
cost-effective resource deferr and
acquisition opportties in line with
near-term updates to load/pnce forecasts,
rnarket conditions, tranmission plans and
regulatory developrnents. PacifiCorp wil
reexamine the timing and tye of gas
resources and other resource changes as
par of a comprehensive assumptions
update and portfolio analysis to be
conducted for the 2008 RFP final short-
list evaluation in the RFP, approved in
Docket UM 1360, the next business plan
and the 2008 IRP u date.
Additional Action Itern 4 - For futue IR
planning cycles, include on-going
financial analysis with regard to
transmission, which includes: a
comparson with altemative supply side
resources, deferred timing decision
cntena, the unique capital cost nsk
'associated with transrnission projects, the
scenaro analysis used to determine the
implications of this nsk on customers,
and all sumares of stochastic annual
production cost with and without the
proposed transrnission segments and base
case se ents.
Additional Action Item 5 - By Augut 2,
2010, complete a wind integrtion study
that has been vetted by staeholders
though a public paricipation process.
Additional Action Itern 6 - Durg the
next planing cycle, work with paries to
investigate carbon dioxide emission
levels as a measure for portfolio
erformnce sconn .
PacifiCorp updated its resource needs assessment
and rnodeling input assumptions as par of the all-
source RFP bid evaluation process, 2011 business
planing process, and 2011 IRprocess.
Documentation on these updates was provided as
par of the Company's application for approval of
its 2008 RFP bidder fial shortlist by the Oregon
Commission (Docket UMJ360). This IRP also fully
documents the cornprehensive assumptions update
for the 2011 IR. See Chapter 5, "Resource Needs
Assessrnent", Chapter 7, "Modeling and Portfolio
Evaluation Approach", and Appendix A, "Load
Forecast Review".
Energy Gateway financial analysis is included in
Chapter 4 of the 2011 IRP. Supportg information
is included as Appendix C.
PacifiCorp completed the wind integrtion study
and distrbuted it to the public via email and Web
site postig on September 1, 2010 in accordance
with the Oregon Commssion granting a deadline
extension frorn August 1 to September 1, 2010. The
stud is included in the 2011 IRP as A endix i.
Total CO2 emissions for the 20-year simulation
penod were included as a final screening
performance measure for portfolio evaluation and
detennnation of the 2011 IR preferred portfolio.
See the "Final Screenin " section of Cha ter 7 and
24
PACIFiCORP~2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
Order No. 10-066,
Docket No. LC 47,
p.27.
Order No. 10-066,
Docket No. LC 47,
p.27.
Order No. 10-066,
Docket No. LC 47,
p.27.
Order No. 10-066,
Docket No. LC 47,
p.26.
Order No. 10-066,
Docket No. LC 47,
p.26.
Additional Action Item 7 - In the next
IR, provide information on total CO2
emissions on a year-to year basis for all
portolios, and specifically, how they
com are with the referred ortolio.
Additional Action Itern 8 - For the next
IR planning cycle, PacifiÇorp will work
with paries to investigate a capaCity
expansion rnodeling approach that
reduces the influence of out-year resource
selection on resource decisions covered
by the IRP Action Plan, and for which the
Cornpany can suffciently show that
portfolio performance is not unduly
influenced by decisions that.are not
relevant to the IR Action Plan.
Additional Action Item 9 - In the next
IR planning cycle, PacifiCorp wil
incorporate its assessment of distrbution
effciency potential resources for
planing puroses.
Revised Action Item 9 (Planing Process
Improvements) - For the next IRP
planning cycle complete the
implementation of System Optimizer
capacity expansion model enhancements
for irnproved representation of CO2 and
RPS regulatory requirements at the
jursdictional leveL. Use the enhanced
model to provide more detailed analysis
of potential hard-cap regulation of carbon
dioxide emissions and achievement of
state or federal ernissions reduction goals.
Also use the capacity expansion model to
evaluate the cost-effectiveness of coal
facility retirernent as a potential response
to futue regulation of carbon dioxide
emissions.
Revised Action Itern 9 (Planning Process
Improvernents) - In the next IRP planing
cycle provide an evaluation of, and
contiue to investigate, the formulation of
satisfactory proxy intermediate-term
rnarket purchase resources for puroses
of portolio modeling and contingent on
ac uiin suitable market data.
portfolio evaluation results in Chapter 8, "Modeling
and Portolio Evaluation Results".
CO2 emissions trend chars for each portfolio,
including the preferred portolio, are included in
AppendixD.
PacifiCorp used portolio development case nuiber
9 for testig how out-year resource selection (years
2021-2030) irnpacts selection of near-term resources
(years 2011~2020). The Company cornpared two
portolios: a base 20-year System Optimizer ru and
a test 20-year ru where resources for the first 10
years are fixed based on a prior 10-year simulation.
Results are sumarzed in Chapter 8, "Modeling
and Portfolio Evaluation Results".
PacifiCorp is conducting a conservation voltage
reduction study, targetig 19 distrbution feeders in
Washington. The study is expected to be cornpleted
by the end of May 2011. Based on prelirninary data .
provided by the contractor for the study, PacifiCorp
developed a distrbution effciency resource for
testing with the System Optimizer modeL. Results of
the portfolio development testing are provided in
Chapter 8, "Modeling and Portfolio Evaluation
Results".
PacifiCorp successfully implemented the Systern
Optimier model enhancernents, and defined five
emission hard cap evaluation cases for modeling
(nos. 15-18, pIus a hard cap case for coal plant
utilization scenaro analysis). PacifiCorp conducted
System Optimizer modeling for five coal plant
utilization scenaros in which coal units are allowed
to be replaced by CCCT resources, taking into
account coal plant incremental costs. Modeling
results are described in Chapter 8, "Modeling and
Portolio Evaluation Results". As noted in this
chapter, the coal utilization study is intended as a
modeling proof-of-concept only.
PacifiCorp's All-sourceRFP, reactivated in
December 2009, yielded no satisfactory proxy
intermediate-term market purchasè resources.
25
PACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIANCE
Order No. 10-066,
Docket No. LC 47,
p.27.
Order No. 10-066,
Docket No. LC 47,
p.24.
Additional Action Itern (not numbered) -
In addition, the Company wil file its
2008 IRP Update approximtely one year
after the date of this Order, in compliance
with Guideline 3.
With regàrd to NWC's suggestion that
appropriate reserves be separtely
determed, we direct the paries to
discuss this issue in the next plang.
The 2011 IRfulfills the filing requirernent, given
that the March 31, 2011 filing date is approximately
one yea after the acknowledgment of the 2008 IRP
(Febru 24, 2010).
PacifiCorp discussed planing reserve margin
analysis at its August 4,2010, public input rneeting.
The Company outlined a 10ss of load study to
determne an appropriate planing reserve rnargin to
apply for portfolio development. Public
staeholders did not take issue with the study
approach. The study was distrbuted for IRP
artci ant review November 18 2010.
UT Docket No. 09-
2035-01, Report &
Order, p. 24.
UT Docket No. 09-
2035-01, Report &
Order, p. 24-25.
UT Docket No. 09-
2035-01, Report &
Order, p. 30.
UT Docket No. 09-
2035-01, Report &
Order, p. 30.
UT Docket No. 09-
2035-01, Report &
Order, p. 30.
UT Docket No. 09-
2035-01, Report &
Order, p. 30.
At a minimum, we direct the Company to
perform a sensitivity case in its next IRP
or IRP update wherein the ENS cost is
flat and based on the Federal Energy
Re lato Commssion rice ca .
Additionally, in an IR public input
rneeting, we direct the Company to
identify a reasonable number of cases,
includig high and low 10ad growt
cases, to cornpare the costs and risks to
custorners, or to identify a reasonable
alternative rnethod, e.g., a LOLP study,
for evaluating an appropriate planning
reserve.
At a minimum we direct the Company to
include the costs of hedging in its IR
analysis of resources that rely on fuels
subject to volatile prices.
We also direct the Company to pedorm
sensitivity analysis to determne a
hedging strategy which minimizes costs
and risks for custorners.
Additionally, we direct the Company to
include an analysis of the adequacy of the
western power rnarket to support the
volumes of purchases on which the
Cornpany expects to rely. We concur with
the Office (of Consumer Services), the
WECC is a reasonable source for this
evaluation. We direct the Company to
identify whether customers or
shareholders wil be expected to bear the
risks associated with its reliance on the
wholesale market.
Finally, we direct the Cornpany to discuss
rnethods to augment the Cornpany's
stochastic analysis of this issue (WECC
rnarket depth and liquidity) in an IRP
This sensitivity analysis is described in the section
entitled, "Cost of EnergyNot Served (ENS)
Sensitivity Analysis" in Chapter 8.
PacifiCorp conducted a stochastic loss of load study
for this IR, which was published November 18,
2010 for review by stakeholders, and is presented as
Appendix 1. The Company also developed high/low
economic growth and l-in-1O peak-producing
temperatue scenarios for evaluating portfolio
irnpacts of alternative load forecasts. The results of
these alternative 10ad forecasts are described in
Chapter 8. Stochastic production cost results are
re ortd in A endix E.
PacifiCorp addresses hedging costs in Appendix G,
"Hedging Strategy".
The Company discusses hedging strategies and the
impacts of varous hedging levels on risk and
expected cost in Appendix G, "Hedgig Strategy".
The Cornpany's analysis of western resource
adequacy is provided as Appendix H. Identification
of who bears the risk ofrnarket reliance (custorners
versus shareholders) is identified as welL.
Based on feedback from partes attending the June
2010 Uta IR stakeholder input rneeting,
PacifiCorp developed a rnarket purchase stress test
proposal, which was vetted at the October 5th IR
26
PACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
public input rneeting for inclusion in the
next IR or IRP update.
general public input meeting. The results of the
stress test, which used stochastic production cost
simulation, are described in Appendix H.
UT Docket No. 09-
2035-01, Report &
Order, p. 35.
UT Docket No. 09-
2035-01, Report &
Order, p. 35.
UT Docket No. 09-
2035-01, Report &
Order, p. 35.
UT Docket No. 09-
2035-01, Report &
Order, p. 38.
We direct the Company to discuss
rnethods for irnproving the evaluation of
nontraditional resources in an IRP public
input meeting. At a minirnum, this
discussion should include ideas for
improving the evaluation of distributed
solar technologies which provide
opportities for customer partcipation,
i.e., a solar rooftop customer buy-down
program, and options for improving the
evaluation of storage technologies
designed to enhance the value and
pedormance of intermittent renewable
resources.
We also concur with the Division and
Offce regarding the need for review of
geothermal resources and direct the
Company to fie a geothermal resource
study as described by the Division within
60 days of the date of this order. We wil
initiate a comment period upon its fiing
and this information can be included in
the next IRP or IRP u date.
In the futue, the Company is directed to
ornit from its core cases any resource for
which it does not already have a signed
final procurement contract or certificate
of public convenience and necessity.
However, this does not preclude the
Company from including such resources
in sensitivity cases. This wil assist with
the consistent and comparable treatment
of resources oin forward.
... we again direct the Company to
address these issues in the next IR or
IR update: i.e.,
. Number of years relied upon for
developing stochastic parameters.
. Role of planning reserve in
managing the risks of forecast error.
PacifiCorp discussed the evaluation of
nontraditional resources, including energy storage,
at the August 4, 2010 IR public input meeting. A
consultat study on incremental capacity value and
ancilary service benefits of energy storage is
planed for 2011 or 2012. This study is identified in
the 2011 IRP action plan.
The geothermal resource report was filed with the
Utah Commission on August 10,2010 in
accordance with the Commission's deadline
extension. A conference call with Uta pares to
discuss the report and the Cornpany's follow-up
activities was held December 9, 2010.
No resource has been fixed in the core portfolios,
except for the 2011 business plan core case #19,
which is intended as a reference case for planed
resources identified in the business plan.
PacifiCorp discussed stochastic parameter updates
at the December 15,2010 IRP public meeting. Due
to time constraints, PacifiCorp tageted its 10ad
stochastic parameters for updating in the 2011,
using a three-year data set originally prepared for
the 2010 wind integration study.
UT Docket No. 09-
2035-01, Report &
Order, p. 39.
(We) direct the Cornpany and interested
paries to exarnine and consider all of the
suggestions contained in (the ODS)
report. At a minimum, the Cornpany is
directed to provide a range of 10ad
forecasts that cornport with industr
standads as recommended by ODS.
Furer, as recommended by ODS, we
direct the Com an to rovide the
As noted above, PacifiCorp adopted the ODS
recommendations for inclusion of 10ad growt
scenaros based on different assumptions concerning
economic drvers. The Company also developed a
l-in-l0 peak-producing ternperatue scenario. The
results of these alternative load forecasts are
described in Chapter 8.
A endix A constitutes the Com an's stadalone
27
PACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
UT Docket No. 09-
2035-01, Report &
Order, p. 40.
UT Docket No. 09-
2035-01, Report &
Order, p. 41.
UTDocketNo.09-
2035~01, Report &
Order, p. 42.
UT Docket No. 09-
2035-01, Report &
Order, p. 54.
UT Docket No. 09~
2035-01, Report &
Order, p. 55.
Uta Commission
Docket No. 08-035-
56, DSM Potential
Study, Report &
Commission with a comprehensive stad-
alone load forecast report when the
forecast is updted. The GDS suggestions
could reduce last minute revisions due to
10ad forecast changes and thereby assist
in the timel corn letion of futue IRs.
We again diect the Company to address
(hydro capacity accounting) in its next
IR or IRP update and provide the results
of its analysis. For example, it may be
useful to conduct sensitivity analysis
regarding this assumption to identify
potential risks or shortomings of the
curent rnethodolo .
We concur with the Division and direct
the Cornpany to complete its own wind
integration study. We understand this
process is underway and that the
Cornpany is circulating the study for
review. We direct the Company to
address the Division's concerns and
include this study in the next IR or IR
u date.
(W)edirect the Company to solicit and
discuss fuer improvements to its
resource acquisition path analysis and
decision rnechanism and address the
Division's concerns in its next IR or IR
update.
In order to ensure tirnely and meaningful
informtion exchange, we diect the
Cornpany to adopt two of the Division's
recommendations on improvig public
input meetigs.
· First, materials should be distrbuted
one week prior to the public input
meeting.
· Secondly, a wrtten report should be
provided after each meeting to
provide follow-up to issues or
uestions raised in the meetin .
We concur with the Division and UAB,
training on the Company's models in
order for paries to validate the models
and to gain confdence in the modeling
results is wortwhile. We diect the
Company to convene at least a full~day
meetin to this end.
The Company proposes to adjust the
technical potential using its assumptions
regarding achievable levels ofDSM to
serve as the supply cures in its IRP. It
load forecast report.
PacifiCorp provided a detailed analysis of I8-hour
sustaned hydro peaking capability and its
applicability to hydro capacity accounting in the
load & resource balance in Appendix H.
PacifiCorp cornpleted the wind integration study
and distrbuted it to the public via email and Web
site posting on September 1,2010. The study is
included in the 2011 IRP as Appendix i.
PacifiCorp expanded the acquisition path analysis to
include alternative reguatory policy scenaros, and
applied sensitivity analysis results to identify
acquisition paths and resource quantities for 10ad
growt and natul gas price forecast trends. A more
extensive discussion of the decision mechanisrn has
been provided in response to the Utah Division of
Public Utilities wrtten comments on the 2008 IR.
PacifiCorp has complied with the requirernent to
distrbute meeting rnaterials one week prior to
public meetings. Written reports on public rneetings
have been prepared and distrbuted to paricipants
via email and postings to the IRP Web site.
PacifiCorp is planng to hold tutorial sessions
durg the second quarer of 20 11 for both Systern
Optimizer and the Planning and Risk modeL. A non-
disclosure agreement between parcipants and the
model vendor, Venty, wil be required due to
sharing of proprietary information.
PacifiCorp ra System Optimizer with DSM supply
cures based on unadjusted techncal potentiaL.
Given the paricular input assumptions used, the
rnodel deferred CCCT resources. The results of this
28
P ACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
Order, p. 8.
DSM Pótential
Study, Docket No.
08-035-56, Report
& Order, p. 9.
DSM Potential
Study, Docket No.
08-035-56, Report
& Order,p. 9.
would then use these adjusted supply
cures in IR to determne cost-effective
amounts ofDSM. UCE and WR
disagree and propose that the Cornpany
use the unadjusted technical potential to
form the supply cures in IRP to
determne the full cost-effective level of
DSM and then rnake provision in its path
or contingency analysis for the possibility
that the cost-effective amouít ofDSM
may not be achieved in the time-frame
rnodeled...we direct the Company to
evaluate the two approaches in its next
IR or IRP update. We encourage the
Cornpany to solicit input from interested
paries on methods for evaluating the two
approaches. We wil request pares'
comments on the Cornpany's evaluation
of the two approaches in an appropriate
IRP or IR u date docket.
With respect to estimating the cost of
solar resources, UCE and WR provide
considerably different cost estimates than
PacifiCorp. The differences are large
enough that we would expect significant
differences to appear in the Company's
IR action plan depending on the
assumptions used in the IR process. We
direct the Cornpany to perform sensitivity
analysis with respect to the assumed cost
of solar resources in its next IRP or IR
u date.
Going forward, the Company shall
provide information on both the total cost
of solar resources in comparson to other
resources, and also the cost to the utility
of a utility-sponsored program to
encourge custorner adoption of this
resource. The Company could begin such
analysis with prelirninar data frorn the
solar incentive pilot program. We direct
PacifiCorp to work with interested paries
regarding how to evaluate solar resources
in the ongoing IRP process and we will
consider comments on this effort in an
appropriate IRP proceedig.
study are described in Chapter 8, "Dernand-side
Management Cases."
PacifiCorp updated all distrbuted generation cost
estiates for the 2011 IR, including solar
resources. The Cadmus Group prepared input
assumptions memos that were distrbuted to public
staeholders for review and comment in July and
August, 2010.
PacifiCorp discussed with interested paries System
Optimizer portolio development scenarios
reflecting a solar PV cost buy-down program. A
conference call was held Janua 27,2011, to
finalize the study approach. The modeling approach
is described in the section titled "Case Definitions"
in Chapter 7. Modeling results are sumarzed in
the section titled, "Renewable Resource Cases" in
Chapter 8.
29
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIANCE
Letter Order, UE-
080826, i\ttchnent
p.1.
Letter Order, UE-
080826, Attchnent
p.1.
Letter Order, UE-
080826, Attchnent
p.4.
Transmission Planning (Chapter 4). The
next IR should discuss alternative
transmission options.
Transmission Planning (Chapter 4). The
next IR should discuss alternative
deployment schedules for the
transmission projects it considers and the
benefits of each of the alternative
deployment schedules of any
transmission segments considered in the
modeling.
Specifically, the varous portolios have
different resource selections durng the
first five years of the planing period.
This rnight result in PacifiCorp, in its
planning process, choosing a set of early
resources because they are in a portfolio
with lower risks in the later years of the
planing horizon, even though the
portolios with higher risks could be
rnitigated by futue flexibility rather than
by choosing a different portolio.
· PacifiCorp should address this issue
in its next IR
The action plan does not specifically
rnention the utility's obligation under
RCW 19.285 to determne and meet
certin energy effciency targets. The
Commission reminds the Company that it
ci t t thO bI'. t
Chapter 4 outlines an analysis of seven Energy
Gateway deployment scenarios that considers
alternative transmission footprints, investment costs,
in-servce dates, and economic drvers.
Chapter 4 focuses on two deployment scenaros
based on alternative directions for state and federal
resource policies: a Green Resource Futue and
Incumbent Resource Futue. Additionally, the
section entitled "Custorner Load and Resources" in
Chapter 4 sumarzes the process that PacifiCorp
follows, in compliance with its Open Access
Transmission Tarff, to plan for and invest in
trnsmission to meet network customer load
re uirements.
PacifiCorp conducted a sensitivity analysis to
isolate the near-term resource selection impact of
out-year resources in the context of capacity
expansion optirnization modeling. The results of the
sensitivity analysis are provided in Chapter 8.
Action Itern Number 6, Class 2 DSM, explicitly
mentions PacifiCorp's obligation to meet energy
effciency targets under RCW 19.285.
.;; /;; :m ;: - 7: ;; ;. 2'%01;", ?/:m..%%v
.%% -i8/ ~/ / . .../%%./ ¿¡ *..¿¡./ Y 1í.ø;"' ;: m ;; 31:jjß ÆS% ;ø ;; ,,~7; z;:~ ~ "~,, %/"%;;øßJ:i~ .;; ;: vA J4t;;;; %;:;: YlYÆ r&! :I"d;~__~".
The Wyoming Public Service Commission provided the following comment in its Letter Order (Docket No. 20000-346-
EA-9, dated 11/23/2010) on PacifiCorp's 2008 IR:
Pursuant to open meeting action taken on January 11,2008, PacifCorp d/b/a Rocky Mountain Power's 2007 Integrated
Resouree Plan (IRP) is hereby plaeed in the Commission's files. No further action wil be taken and this docketed matter
is closed.
30
P ACIFICORP - 2011 IR APPENDIX B - IR REGULATORY COMPLIACE
Table B.3 - Oregon Public Utilty Commission IRP Standard and Guidelines
l.a.1 All resources rnust be evaluated on a consistent
and comparable basis:
All known resources for rneetig the utility's
load should be considered, including supply-
side options which focus on the generation,
purchase and trnsmission of power - or gas
purchases, transporttion, and storage - and
demand-side options which focus on
conservation and dernand response.
PacifiCorp considered a wide range of resources including
renewables, demand-side management, distrbuted
generation, energy storage, power purchases, thermal
resources, and transmission. Chapters 4 (Transmission
Planning), 6 (Resource Options), and 7 (Modeling and
Portolio Evaluation Approach) document how PacifiCorp
developed these resources and modeled them in its
portfolio analysis. All these resources were established as
resource options in the Company's capacity expansion
optimization model, System Optimizer, and selected by the
rnodel based on relative economics, resource size,
availability dates, and other factors.
All portfolios developed with Systern Optimizer were
subjected to Monte Carlo production cost simulation.
These portfolios contained a varety of resource tyes with
different fuel tyes (coal, gas, biomass, nuclear fuel, "no
fuel" renewables), lead-times (ranging from front offce
transactions to nuclear plants), in-service dates, life-tirnes,
and locations.
PacifiCorp fully complies with this requirement. The
company developed generic supply-side resource attbutes
based on a consistent characterization rnethodology. For
dernand-side resources, the company used the Cadmus
Group's supply cure data developed in 2010 for
representation ofDSM and distrbuted generation
resources, which was also based on a consistently applied
methodology for determining technical, rnarket, and
achievable DSM potentials. All portolio resources were
evaluated using the same sets of price and 10ad forecast
inputs. These inputs are documented in Chapters 6 and 7.
PacifiCorp applied its after-tax W ACC of 7.17 percent to
discount all cost streams.
PacifiCorp fully complies with this requirement. Each of
the sources of risk identified in this gudeline is treated as a
stochastic variable in Monte Carlo production cost
simulation with the exception of CO2 emission compliance
costs, which are treated as a scenario risk. See the
stochastic rnodeling rnethodology section in Chapter 7.
PacifiCorp complied with this guideline by discussing
resource risk mitigation in Chapter 9 as well as addressing
market reliance risk and hedging strategies in Appendix G
and H, respectively. Topics covered include: (1) managing
carbon risk for existing plants, (2) the use of physical and
l.a.2 All resources must be evaluated on a consistent
and cornparable basis:
Utilities should compare different resource fuel
tyes, technologies, lead tirnes, in-servce dates,
durations and locations in portfolio risk
modeling.
1.a.3 All resources rnust be evaluated on a consistent
and comparable basis:
Consistent assumptions and methods should be
used for evaluation of all resources.
l.aA All resources rnust be evaluated on a consistent
and comparable basis:
The after-tax rnarginal weighted-average cost
of capital (W ACC) should be used to discount
all futue resource costs.
Risk and uncertinty must be considered:
At a miimum, utilities should address the
followig sources of risk and uncertainty:
1. Electrc utilities: load requirements,
hydroelectric generation, plant forced outages,
fuel prices, electricity prices, and costs to
cornply with any regulation of greenhouse gas
emissions.
Risk and uncertinty rnust be considered:
Utilities should identify in their plans any
additional sources of risk and uncertinty.
l.b.1
l.b.2
31
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
I.c
.I.c.l
I.c.2
I.c.3.1
I.c.3.2
l.cA
I.d
The priar goal must be the selection of a
portolio of resources with the best combination
of expected costs and associated risks and
uncertainties for the utilty and its customers
("best cost/risk portolio").
The planing horizon for analyzing resource
choices should be at least 20 years and account
for end effects. Utilities should consider all
costs with a reasonable likelihood of being
included in rates over the long term, which
extends beyond the planning horizon and the
life of the resource.
Utilities should use present value of revenue
requirernent (PVR) as the key cost metrc.
The plan should include analysis of curent and
estirnated futue costs for alllong-lived
resources such as power plants, gas storage
facilties, and pipelines, as well as all short-
lived resources such as gas supply and short-
term power purchases.
To address risk, the plan should include, at a
minimum:
1. Two measures of PVR risk: one that
measures the varability of costs and one that
measures the severity of bad outcomes.
To address risk, the plan should include, at a
rninimum:
2. Discussion of the proposed use and impact
on costs and risks of physical and financial
hedging.
The utility should explain in its plan how its
resource choices appropriately balance cost and
risk.
The pIan must be consistent with the long-ru
public interest as expressed in Oregon and
fedeml energy policies.
financial hedging for electrcity price risk, and (3)
managing gas supply risk. Regulatory and financial risks
associated with resource and transmission investments are
highighted in seveml areas in the IRP document, including
Chapters 4 and 8.
PacifiCorp evaluated cost/risk tradeoffs for each of the
portolios considered, See Chapter 8 for the cornpany's
portolio cost/risk analysis and determation of the
preferred portolio.
PacifiCorp used a 20-year study period for portfolio
modeling, and a reallevelized revenue requirement
methodology for treatment of end effects consistent with
past IRP practice.
PacifiCorp fuly complies. Chapter 7 provides a
description of the PVR methodology.
PacifiCorp uses the stadad deviation of stochastic
production costs as the measure of cost variability. For the
severity of bad outcornes, the company calculates several
rneasures, includig stochastic upper-tail mean PVR
(rnean of highest five Monte Carlo itemtions) and the 95th
percentile stochastic production cost PVR.
A discussion on costs and risks of hedging is provided in
Appendi G.
Chapter 8 sumarzes the results ofPacifiCorp's cost/risk
tradeoff analysis, and describes what criteria the company
used to determine the best cost/risk portfolios and the
preferred portfolio.
PacifiCorp considered both curent and potential state and
fedeml energy/pollutat emission policies in portfolio
modeling. Chapter 7 describes the decision process used to
derive portolios, which includes considemtion of state
resource policies. The IR action plan chapter also
presents an acquisition path analysis that describes
resource strategies based on reguatory trgger events.
32
PACIFiCORP-2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
2.a The public, which includes other utilities,
should be allowed significant involvernent in
the preparation of the IRP. Involvement
includes opportities to contrbute information
and ideas, as well as to receive information.
Paries must have an opportity to make
relevant inquires of the utility formulatig the
plan. Disputes about whether informtion
requests are relevant or uneasonably
burdensorne, or whether a utility is being
properly responsive, may be submitted to the
Commission for resolution.
While confidential information rnust be
protected, the utility should make public, in its
pIan, any non-confidential information that is
relevant to its resource evaluation and action
plan. Confidential information may be
protected through use of a protective order,
through aggregation or shielding of data, or
through any other mechanism approved by the
Commission.
The utility rnust provide a draft IRP for public
review and comment prior to filing a final plan
with the Commssion.
PacifiCorp fuly complies with this requirement. Chapter 2
provides an overview of the public process, while
Appendix D documents the details on public meetings held
for the 2008 IRP.
Both IR volumes provide non-confidential information
the cornpany used for portfolio evaluation, as well as other
data requested by staeholders. PacifiCorp also provided
staeholders with non-confidential information to support
public rneeting discussions via emaiL.
PacifiCorp distrbuted a parial draft IRP document for
external review on February 23, 2011 and the rernaining
chapters on March 7, 2011.
2.b
2.c
(3)A utility must fie an IRP within two years of
its previous IR acknowledgment order. If the
utility does not intend to take any significant
resource action for at least two years after its
next IRP is due, the utility rnay request an
extension of its filing date frorn the
Commission.
The utility rnust present the results of its fied
plan to the Commission at a public meeting
prior to the deadline for wrtten public
comment.
Commission staff and parties rnust cornplete
their comments and recommendations within
six rnonths of IR filing.
The Commission must consider comments and
recommendations on an energy utility's pIan at
a public meeting before issuing an order on
acknowledgment. The Commission rnay
provide the energy utility an opportity to
revise the IRP before issuig an
acknowledgment order.
The Commission rnay provide direction to a
utility regarding any additional analyses or
actions that the utility should underte in its
nextlRP.
This PIan complies with this requirement.
Not applicable; activity conducted subsequent to fiing this
IRP.
Not applicable; activity conducted subsequent to fiing this
IRP.
Not applicable; activity conducted subsequent to fiing this
IR.
Not applicable; activity conducted subsequent to filing this
IRP.
(4)
(5)
(6)
(7)
33
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
(8)Each energy utility rnust submit an anual
update on its rnost recently acknowledged IR.
The update is due on or before the
acknowledgrnent order aniversar date. The
energy utility must sumare the anual
update at a Commission public meetig. The
energy utility may request acknowledgment of
changes, identified in its update, the IR action
pIan. The annual update is an informational
fiing that:
(a) Describes what actions the energy utility
has taken to implement the action pIan to
select best portolio of resources contained
in its acknowledged IR;
(b) Provides an assessrnent of what has
changed since the acknowledgment order
that affects the action plan to select best
portolio of resources, including changes in
such factors as load, expiration of resource
contrcts, supply-side and demand-side
resource acquisitions, resource costs, and
transmission availability; and
(c) Justifies any deviations from the action
plan contained in its acknowledged IR.
As soon as an energy utility anticipates a
significant deviation from its acknowledged
IRP, it must fie an update with the
Commission, unless the energy utility is within
six rnonths of fiing its next IRP. This update
rnust meet the requirements set fort in section
(8) of this rule.
If the energy utility requests Commission
acknowledgernent of its proposed
changes to the action plan contained in its
acknowledged IRP:
(a) The energy utility must fie its proposed
changes with the Commission and present
the results of its proposed changes to the
Commission at a public meeting prior to
the deadline for wrtten public comment;
(b) Commission staff and partes must file any
comments and recommendations with the
Commission and present such comments
and recommendations to the Commission
at a public meeting within six rnonths of
the energy utility's filing of its request for
acknowledgement of proposed changes;
(c) The Commission may provide direction to
an energy utility regardig any additional
analyses or actions that the utility should
underte in its next IR.
(9)
Not applicable; activity conducted subsequent to filing this
IR.
Not applicable; activity conducted subsequent to fiing this
IR.
Not applicable; activity conducted subsequent to filing this
IRP.
34
PACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
4.a
4.b
An explanation of how the utility met each of
the substative and procedural requirernents.
Analysis of high and low load growth scenaros
in addition to stochastic load risk analysis with
an explanation of major assumptions.
4.c For electrc utilities, a determination of the
levels of peaking capacity and energy capability
expected for each year of the plan, given
existing resources; identification of capacity
and energy needed to bridge the gap between
expected loads and resources; rnodeling of all
existing transmission rights, as well as futue
transmission additions associated with the
resource portfolios tested.
F or gas utilities only
Identification and estimated costs of all supply-
side and dernand side resource options, taking
into account anticipated advances in technology
The purose of this table is to cornply with this guideline.
PacifiCorp developed low and high load growt forecasts
for scenaro analysis based on economic growt
assumptions using the Systern Optimizer model for
portfolio development. Stochastic varability of loads was
also captued in the risk analysis. See Chapters 5, 7, and 8,
as well as Appendix A, for load forecast information.
Chapter 8 also describes how 10ads are handled in the
stochastic modeling.
This Plan complies with the requirement. See Chapter 5 for
details on anual capacity and energy balances. Existig
trmission rights are reflected in the IRP model
topologies, as rnentioned in Chapter 7.
Not applicable
Chapter 6 identifies the resources included in this 1R, and
provides their detailed cost and performance attbutes. See
Tables 6.2 through 6.10 for supply-side resources, and
Tables 6.15 through 6.20 for demand-side resources.
In addition to incorporating a planing reserve margin for
all portolios evaluated, the company used several
measures to evaluate relative portfolio supply reliability.
These are described in Chapter 7 (Energy Not Served and
Loss of Load Probability). PacifiCorp conducted a
stochastic loss ofload study in 2010 to support selection of
the planing reserve rnargin. This study is included as
Appendix J.
Chapter 7 describes the key assumptions and alternative
scenarios used in this IRP.
This Plan documents the development and results of 67
portfolios designed to determe resource selection under a
variety of input assumptions (Chapter 8).
Chapter 8 and Appendix E present the stochastic portfolio
rnodeling results, and describes portolio attibutes that
explain relative differences in cost and risk performance.
Chapter 8 provides tables and char with performnce
rneasure results, including ran ordering.
4.d
4.e
4.f Analysis of rneasures the utility intends to take
to provide reliable service, including cost-risk
tradeoffs
4.g Identification of key assumptions about the
futue (e.g., fuel prices and environmental
cornpliance costs) and alternative scenaros
considered
Constrction of a representative set of resource
portolios to test varous operating
characteristics, resource types, fuels and
sources, technologies, lead tirnes, in-service
dates, durations and generallocations - system-
wide or delivered to a specific porton of the
system
Evaluation of the performance of the candidate
portfolios over the range of identified risks and
uncertinties
Results of testing and ran orderig of the
portfolios by cost and risk metrc, and
interpretation of those results.
4.h
4.i
4.j
35
P ACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIACE
4.k Analysis of the uncertinties associated with
each portfolio evaluated.
Selection of a portfolio that represents the best
cornbination of cost and risk for the utility and
its customers.
Identification and explanation of any
inconsistencies of the selectedportolio with
any state and federal energy policies that may
affect a utility's plan and any barers to
irnplementation.
An action plan with resource activities the
utility intends to underte over the next two to
four year to acquire the identified resources,
regardless of whether the activity was
acknowledged in a previous IR, with the key
attbutes of each resource specified as in
portolio testing.
4.1
4.m
PacifiCorp fully complies with this guideline. See the
responses to I.b.1 and I.b.2 above.
See I.c above.
This IR is presumed to have no inconsistencies.
Chapters 9 and 10 presents the 2011 IRP and transrnission
expansion action plans, respectively.
5 Portolio analysis should include costs to the
utility for the fuel trsportation and electrc
trnsmission required for each resource being
considered. In addition, utilities should consider
fuel trnsporttion and electrc transmission
facilities as resource options, taing into
account their value for making additional
purchases and sales, accessing less costly
resources in rernote locations, acquirg
alternative fuel supplies, and improving
reliability.
PacifiCorp evaluated proxy transmission resources on a
comparable basis with respect to other proxy resources in
this IR. Fuel transporttion costs were factored into
resource costs.
6.a
6.b
Each utility should ensure that a conservation
potential study is conducted periodically for its
entire service terrtory.
To the extent that a utility controls the level of
fuding for conservation prograrns in its service
terrtory, the utility should include in its action
plan all best cost/risk portolio conservation
resources for meeting projected resource needs,
specifYing annual savings tagets.
To the extent that an outside par adisters
conservation program in a utility's servce
terrtory at a level of fuding that is beyond the
utility's control, the utility should:
1. Determe the amount of conservation
resources in the best cost/risk portfolio
without regard to any limits on funding of
conservation programs; and
2. IdentifY the preferred portfolio and action
plan consistent with the outside par's
projection of conservation acquisition.
6.c
A multi-state dernand-side management potentials study
was cornpleted in late 2010, and those results were
incorporated into this plan.
PacifiCorp's energy effciency supply cures incorporate
Oregon resource potentiaL. Oregon potential estimates were
provided by the Energy Trust of Oregon. See the dernand-
side resource section in Chapter 6.
See the response for 6.b above.
36
P ACIFICORP - 2011 IRP APPENDIX B - IRP REGULATORY COMPLIANCE
7 Plans should evaluate demand response
resources, including voluntary rate programs,
on par with other options for rneeting energy,
capacity, and transmission needs (for electrc
utilities) or gas supply and transporttion needs
(for natual gas utilities).
PacifiCorp evaluated demand response resources (Class 3
DSM) on a consistent basis with other resources in a
portfolio sensitivity study. Class 3 DSM programs are
addressed in !tern 7 of the IR action pIan in Chapter 9.
8
/ .~~;gji ;;;; ll 1!/ i/ %7/ ;;WJ ru :ø: m~ ;; / Y' 0i ;; ,;/"' /ÝZ;: 1% ;: *XW/;;¿¿. 8l Al _ilL ////III1Jl /; % /; // $;;/ "" %/;; / ;ff~ ~
a. Base Case and Other Compliance
Scenarios
b. Testing Alternative Portolios Against the
Compliance Scenarios
c. Trigger Point Analysis
d. Oregon Compliance Portfolio
This IRP fully complies with the CO2 compliance cost
analysis requirernents in Order No. 08-339. Performance
results for CO2 compliance scenaro portfolios are reported
in Chapter 8, including hard cap scenaros using the
Oregon emission targets in HB 3543.
10 Multi-state utilities should plan their generation
and transmission systems, or gas supply and
delivery, on an integrated systern basis that
achieves a best cost/risk portfolio for all their
retail custorners.
The 2011 IRP conforms to the multi-state planing
approach as stated in Chapter 2 ("The Role ofPacifiCorp's
Integrated Resource Planing"). The Company notes the
challenges in complying with rnulti-state integrated
planning given differig state energy policies and resource
preferences.
11 Electrc utilities should analyze reliability
within the risk rnodeling of the actul portfolios
being considered. Loss ofload probability,
expected planing reserve rnargin, and expected
and worst-case unserved energy should be
determined by year for top-performing
portfolios. Natual gas utilities should analyze,
on an integrated basis, gas supply,
transporttion, and storage, along with demand-
side resources, to reliably meet peak, swing,
and base-load system requirements. Electrc
and natual gas utility plans should dernonstrate
that the utility's chosen portfolio achieves its
stated reliability, cost and risk objectives.
PacifiCorp fully complies with this guideline. See the
response to l.c.3.1 above. Chapter 8 describes the role of
reliability, cost, and risk measures in determning the
preferred portfolio. Scatter plots of portolio cost versus
risk at different CO2 cost levels were used to inform the
cost/risk tradeoff analysis. (Chapter 8).
12
~"~l\P."ip _~i; ~ .~2£!1P~..f!../ / Vi/gAy /0/0 øuiv % %/;¡ i¡ % / %.i 0.
Electrc utilities should evaluate distrbuted
generation technologies on par with other
supply-side resources and should consider, and
quantify where possible, the additional benefits
of distrbuted generation.
PacifiCorp evaluated several tyes of distrbution
generation, including cornbined heat and power and solar.
The results of these evaluations are documented in Chapter
8.
37
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
l3.a An electrc utility should, in its IRP:Chapter 9 outlines the procurement approaches for
resources identified in the preferred portolio.
A discussion of the advantages and disadvantages of
owning a resource instead of purchasing it is included in
Chapter 9.
Company resources included in RFPs is addressed in the
action pIan (Table 9.1 and accompanying narative).
1. Identify its proposed acquisition strtegy for
each i:esource in its action pIan.
2. Assess the advantages and disadvantages of
owning a resource instead of purchasing
power from another par
3. Identify any Benchmark Resources it plans to
consider in competitive bidding
l3.b For gas utilities only Not applicable
Table B.4 - Utah Public Service Commission IR Standard and Guidelines
1 The Commission has the legal authority to
promulgate Standards and Guidelines for
integrated resource planning.
Informtion Exchange is the most reasonable
rnethod for developing and implementing
integrated resource planng in Utah.
Prudence Reviews of new resource acquisitions
wil occur durg raternakg proceedings.
PacifiCorp's integrated resource planing process
wil be open to the public at all stages. The
Commission, its staff, the Division, the
Committee, appropriate Utah state agencies, and
other interested paries can partcipate. The
Commission will pursue a rnore active-directive
role if deerned necessar, after formal review of
the planing process.
Consideration of environmental externalities and
attendat costs must be included in the integrated
resource planning analysis.
Not addressed; this is a Utah Public Service Commission
responsibility.
Information exchange has been conducted thoughout the
IR process.
Not addressed; raternaking occurs outside of the IR
process.
PacifiCorp's public process is described in Chapter 2. A
record of public meetings is provided as Appendix D.
PacifiCorp used a scenario analysis approach along with
externality cost adders to rnodel environmental externality
costs. See Chapter 7 for a description of the methodology
employed, including how CO2 cost uncertainty is factored
into the determation of relative portfolio performance.
Supply, trsmission, and demand-side resources were
evaluated on a comparable basis using PacifiCorp's
capacity expanion optimization modeL. Also see the
response to number 4.b.ii below.
Consistent with the Utah rules, PacifiCorp determination
of avoided costs wil be handled in a maer consistent
with the IR, with the caveat that the costs may be updated
if better information becornes available.
2
3
4
5
6 The integrated resource plan must evaluate
supply-side and demand-side resources on a
consistent and comparable basis.
38
7 A voided Cost should be determined in a manner
consistent with the Cornpany's Integrated
Resource PIan.
PACIFiCORP-20ll IRP APPENDIX B - IRP REGULATORY COMPLIANCE
8 The planning standards and guidelines must rneet
the needs of the Utah servce area, but since
coordination with other jursdictions is importnt,
must not ignore the rues governg the planning
process already in place in other jursdictions.
The Company's Strategic Business PIan must be
directly related to its Integrated Resource Plan.
9
This IR was developed in consultation with pares frorn
all state jursdictions, and meets all formal state IR
guidelines.
Chapter 9 describes the linage between the 2011 IR
preferred portfolio and 2011 business plan resources
approved in December 2010. Significant resource
differences are highlighted.
1
2
Definition: Integrated resource planning is a
utility planing process which evaluates all
known resources on a consistent and comparable
basis, in order to meet curent and futue customer
electrc energy services needs at the lowest total
cost to the utility and its custorners, and in a
manner consistent with the long-ru public
interest. The process should result in the selection
of the optimal set of resources given the expected
combination of costs, risk and uncertinty.
The Company wil submit its Integrated Resource
Plan biennially.
Chapter 7 outlines the portfolio performance evaluation
and preferred portfolio selection process, while Chapter 8
chronicles the rnodeling and preferred portfolio selection
process. This IRP also addresses concerns expressed by
Uta staeholders and the Utah commission concernng
comprehensiveness of resources considered, consistency in
applying input assumptions for portfolio rnodeling, and
explanation ofPacifiCorp's decision process for selecting
top-performg portfolios and the preferred portfolio.
The company submitted its last IR on May 28, 2009, and
filed this IR on March 31,2011. PacifiCorp files the IRP
with all commissions on March 31 in each odd-numbered
year.
3 PacifiCorp's public process is described in Chapter 2. A
record ofpublic rneetings is provided as Appendix F.
4.a
IR will be developed in consultation with the
Commission, its staff, the Division of Public
Utilities, the Committee of Consumer Services,
appropriate Utah state agencies and interested
paries. PacifiCorp wil provide arnple opportity
for public input and information exchange durg
the development of its Plan.
PacifiCorp's integrated resource plans will
include: a range of estimates or forecasts ofload
growt, including both capacity (kW) and energy
(kWh) requirements.
4.a.i The forecasts wil be rnade by jurisdiction and by
general class and wil differentiate energy and
capacity requirements. The Company wil include
in its forecasts all on-systern loads and those off-
system loads which they have a contrctul
obligation to fulfiL. Non-fir off-systern sales are
uncertin and should not be explicitly
incorporated into the load forecast that the utility
then plans to rneet. However, the Plan must have
PacifiCorp implemented a 10ad forecast range for both
capacity expansion optimization scenarios as well as for
stochastic variability, covering both capacity and energy.
Details concerning the 10ad forecasts used in the 2011 IRP
are provided in Appendix A. Figure 7.4 in Chapter 7 shows
the range of forecasts used for capacity expansion
modeling. Figues 7.i 8 though 7.24 show the range of
stochastic loads modeled for each 1000 area by the Monte
Carlo production cost sirnulations.
Price risk associated with rnarket sales is captued in the
cornpany's stochastic sirnulation results. Curent off-
system sales agreements are included in the IRP rnodels.
39
PACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
some analysis of the off-system sales market to
assess the impacts such makets wil have on nsks
associated with different acquisition strategies.
4.a.ii Analyses of how vanous economic and
dernographic factors, includig the pnces of
electrcity and alternative energy sources, wil
affect the consumption of electrc energy services,
and how changes in the number, tye and
effciency of end-uses wil affect futue load.
4.b An evaluation of all present and futue resources,
including futue maket opportities (both
dernand-side and supply-side), on a consistent and
comparable basis.
4.b.i An assessment of all technically feasible and cost-
effective improvements in the efficient use of
electrcity, including load managernent and
conservation.
4.b.i An assessment of all technically feasible
generating technologies including: renewable
resources, cogeneration, power purchases from
other sources, and the constrction of thermal
resources.
4.b.i The resource assessments should include: life
ii expectancy of the resources, the recognition of
whether the resource is replacing/adding capacity
or energy, dispatehability, lead-time requirements,
flexibility, efficiency of the resource and
opportnities for custorner paricipation.
4.c An analysis of the role of competitive bidding for
dernand-side and supply-side resource
acquisitions
A 20-year planing honzon.
An action plan outlining the specific resource
decisions intended to implement the integrted
resource plan in a maner consistent with the
Company's strtegic business pIan. The action
plan wil span a four-year honzon and wil
descnbe specific actions to be taen in the first
two years and outline actions anticipated in the
last two year. The action pIan will include a
status report of the specific actions contained in
the previous action pIan.
4.d
4.e
Appendix A documents how dernographic and pnce
factors are used in PacifiCorp's new 10ad forecasting
methodology.
Resources were evaluated on a consistent and comparable
basis using the System Optimizer rnodel and Planng and
Risk production cost modeL.
PacifiCorp included supply cures for Class 1 DSM
(dispatchable/schedulable load control) and Class 2 DSM
(energy effciency measures) in its capacity expansion
modeL. Details are provided in Chapter 6. A sensitivity
study of dernand-response prograrns (Class 3 DSM) was
also conducted (See Chapter 8).
PacifiCorp considered a wide range of resources including
renewables, cogeneration (combined heat and power),
power purchases, thermal resources, energy storage, and
Energy Gateway trsmission segments. Chapters 4, 6 and
7 document how PacifiCorp developed and assessed these
technologies and resources.
PacifiCorp captues and rnodels these resource attbutes in
its IR models. Resources are defined as providing
capacity, energy, or both. The DSM supply cures and
distrbuted generation resources used for portfolio
modeling explicitly incorporate estimated rates of prograrn
and event parcipation.
Dispatchability is accounted for in both IRP models used;
however, the Planing and Risk model provides a more
detailed representation of unt dispatch than Systern
Optier, and includes modeling of unit commtment and
reserves.
A descnption of the role of cornpetitive bidding and other
procurement methods is provided in Chapter 9.
This IR uses a 20-year study horizon (2011-2030)
The IR action pIan is provided in Chapter 9. A status
report of the actions outlined in the previous action plan
(2008 IR update) is provided in Chapter 9 as well.
The action plan (Table 9.1) also identifies actions
anticipated to extend beyond the next two years, or occur
aftr the next two years
40
P ACIFICORP - 2011 IRP APPENDIX B -lR REGULATORY COMPLIANCE
4.f A plan of different resource acquisition paths for
different economic circumstances with a decision
mechanisrn to select among and modify these
paths as the futue unfolds.
Chapter 9 includes an acquisition path analysis that
presents broad resource strategies based on regulatory
trgger events, combinations of load growt and gas price
futues, and procurement delays. The associated decision
mechanisrn is also described in more detail relative to the
2008IRP.
PacifiCorp provides resource-specific utility and total
resource cost information in Chapter 7.
The lR document addresses the impact of social concerns
on resource cost-effectiveness in the following ways:
. Portolios were evaluated using a range of CO2 cost
futues.
. A discussion of environmental policy status and
impacts on utility resource planning is provided in
Chapter 3.
. State and proposed federal public policy preferences
for clean energy are considered for developrnent of the
preferred portfolio, which is documented in Chapter 8.
. Appendix L reports historical water consumption for
PacifiCorp's thermal plants.
The handling of resource risks is discussed in Chapter 9,
and covers managing carbon risk for existig plants and
managing gas supply risk. Transmission expansion risks
are discussed in Chapter 3. Appendix G discusses hedging.
Appendix'H discusses rnarket reliance risks and identifies
who bears associated risks.
Resource capital cost uncertinty and technological risk is
addressed in Chapter 6 ("Handling of Technology
Irnprovernent Trends and Cost Uncertainty").
For reliability risks, the stochastic simulation model
incorporates stochastic volatility of forced outages for new
thermal plants and hydro availability. These risks are
factored into the comparative evaluation of portolios and
the selection of the preferred portolio upon which the
action plan is based.
Identification of the classes of risk and how these risks are
allocated to ratepayers and investors is discussed in
Chapter 9.
Flexibility in the planing and procurement processes is
highlighted in Chapter 9 and the action plan (Table 9.1).
PacifiCorp exarnined the trade-off between portolio cost
and risk. This trade-off analysis is documented in Chapter
8, and highlighted through the use of scatter-plot graphs
showig the relationship between stochastic mean and
upper-tail mean stochastic PVR.
4.g An evaluation of the cost-effectiveness of the
resource options from the perspectives of the
utility and the different classes of ratepayers. In
addition, a description of how social concerns
might affect cost effectiveness estirnates of
resource options.
4.h An evaluation of the financial, competitive,
reliability, and operational risks associated with
various resource options and how the action plan
addresses these risks in the context of both the
Business Plan and the 20-year Integrated
Resource Plan. The Company wil identify who
should bear such risk, the ratepayer or the
stockholder.
4.i Considerations permtting flexibility in the
planning process so that the Company can take
advantage of opportities and can prevent the
prematue foreclosure of options.
An analysisoftradeoffs; for exarnple, between
such conditions of service as reliability and
dispatchability and the acquisition of lowest cost
resources.
4.j
41
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
4.k A range, rather than attempts at precise
quantification, of estimated external costs which
rnay be intangible, in order to show how explicit
consideration of thern might affect selection of
resource options. The Company will attempt to
quantify the magnitude of the externalities, for
example, in terms of the amount of emissions
released and dollar estimates of the costs of such
externalities.
A narrative describing how curent rate design is
consistent with the Company's integrted resource
planning goals and how changes in rate design
might facilitate integrated resource planning
objectives.
PacifiCorp wil submit its IRP for public
comment, review and acknowledgement.
4.1
5
6 The public, state agencies and other interested
paries wil have the opportity to make formal
comment to the Commission on the adequacy of
the Plan. The Commission wil review the Plan
for aderence to the principles stated herein, and
wil judge the rnerit and applicability of the public
comment. If the Plan needs fuer work the
Commission wil retu it to the Cornpany with
comments and suggestions for change. This
process should lead more quickly to the
Commission's acknowledgement of an acceptable
Integrated Resource Plan. The Cornpany will give
an oral presentation of its report to the
Commission and all interested public paries.
Formal hearngs on the acknowledgement of the
Integrated Resource PIan rnight be appropriate but
are not required.
Acknowledgernent of an acceptable PIan wil not
guarantee favorable ratemaking treatment of
futue resource acquisitions.
The Integrated Resource PIan will be used in rate
cases to evaluate the performce of the utilty
and to review avoided cost calculations.
7
8
PacifiCorp incorporated environmental externality costs
for CO2, NOx, S02, and mercur with use of cost adders
and assumptions regarding the form of compliance strategy
(for example, a per-ton tax and hard emissions caps for
COi). For CO2 externality costs, the cornpany used
scenaros with varous cost levels to captue a reasonable
rage of cost impacts. These cost assumptions are
described in Chapter 7.
The role of Class 3 DSM (price response programs) at
PacifiCorp and how these resources are modeled in the IR
are described in Chapter 6.
PacifiCorp distrbuted a parially completed draft IRP
document for public review and comment on Febru 23,
2011, and the cornplete drft IRP document (Volume 1) on
March 7, 2011.
Not addressed; this is a post-fiing activity.
Not addressed; this is not a PacifiCorp activity.
Not addressed; this refers to a post-fiing activity.
42
PACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
Table B.5 - Washington Utilities and Transportation Commission IR Standard and Guidelines
(WAC 480-100-238)
(5)
(2)(a)
(2)(a)
(2)(a)
(2)(b)
(2)(b)
(2)(b)
(2)(b)
(2)(b)
(4)Work plan fied no later than 12 rnonths
before next IRP due date.
Work plan outlines content ofIR,
PacifiCorp fied the IR work plan on March 31,2010, given an
anticipated IR fiing date of March 31, 2011.
See pages 1-2 of the Work Plan document for a sumaration of
IR contents.
See pages 2-5 of the Work Plan document for a sumarzation of
resource analysis.
See pages 6-7 of the Work PIan. Figue 2, page 6, document for the
IR schedule.
The Commission issued an Order on December 11,2008, under
Docket no. UE-070117, granting the Company permssion to file its
IRP on March 31 of each odd numbered year. PacifiCorp fied the
2011 IR on March 31, 2011.
Not applicable; activity conducted subsequent to filing this IR.
Not applicable; activity conducted subsequent to filing this IRP.
Chapter 5 describes the mix of existing resources, while Chapter 8
describes the 2011 IR preferred portfolio. For exarnple, see Tables
8.1 6 and 8.17, as well as Fi es 8.11 and 8.1 2.
See Chapter 8 for a description of how conservation supplies are
represented and modeled. Refer to Tables 8.16 and 8.17, as well as
Figues 8.11 and 8.12. The 2010 resource potential study upon
which conservation supplies are based is available frorn
PacifiCorp's demand-side management Web site,
h ://VolWW. cifico .comlesídsm.html.
The 2011 IR preferred portolio was based on a resource needs
assessment that accounted for forecasted load growt, expirtion of
existing power purchase contracts, resources under constrction,
contrct, or reflected in the Cornpany's capital budget, as well as a
capacity planning reserve margin. Details on PacifiCorp's findigs
of resource need are described in Chapter 5. For example, see Table
5.11 for PacifiCo's ca aci 10ad and resource balance.
PacifiCorp uses portfolio performance measures based on the
Present Value of Revenue Requirernents (PVR) methodology. See
the section on ortfolio erformance measures in Cha ter 7.
Chapter 6, Resource Options, provides detailed information on costs
and other attributes for all resources analyzed for the IRP. For
exam Ie, see Tables 6.1 thou h 6.8,6.10, and 6.12.
PacifiCorp ernploys Monte Carlo production cost simulation with a
stochastic rnodel to characterie market price and gas price
volatility. See the section entitled, "Monte Carlo Production Cost
Simulation" in Cha ter 7 for a sum of the modelin a roach.
PacifiCorp captued demand-side resource uncertainties through the
development ofnurnerous portolios based on different sets of input
assum tions.
PacifiCorp uses two IR rnodels that simulate the dispatch of
existing and futue resources based on such attbutes as heat rate,
availability, fuel cost, and varable O&M cost. The chronological
roduction cost simulation model also inco orates unit
(4)
(4)Work plan outlines method for assessing
potential resources. (See LRC analysis
below
Work pIan outlines timing and extent of
ublic arici ation.
Integrated resource plan submitted
within two years of previous plan.
(5)
(4)
(5)Commission issues notice of public
hearg after company files plan for
review.
Commission holds public hearng.
Plan describes the rnix of energy supply
resources.
PIan describes conservation supply.
Plan addresses supply in terms of
curent and futue needs.
Plan uses lowest reasonable cost (LRC)
analysis to select the mix of resources.
LRC analysis considers resource costs.
LRC analysis considers rnarket-
volatility risks.
LRC analysis considers dernand side
resource uncertinties.
LRC analysis considers resource
dispatchability .
43
PACIFICORP - 2011 IRP APPENDIX B - IR REGULTORY COMPLIACE
(2)(b)
(2)(b)
(2)(b)
(2)(b)
(2)(c)
(3)(a)
(3)(a)
LRC analysis considers resource effect
on system operation.
LRC analysis considers nsks imposed
on ratepayers.
LRC analysis considers public policies
regardig resource preference adopted
by Washington state or federal
governent.
LRC analysis considers cost of nsks
associated with environmental effects
including ernissions of carbon dioxide.
Plan defines conservation as any
reduction in electrc power consumption
that results fÌorn increases in the
efficiency of energy use, production, or
distrbution.
PIan includes a range of forecasts of
futue demand.
Plan develops forecasts using methods
that examine the effect of economic
forces on the consumption of electrcity.
commtment logic for handling start-up, shutdown, rarnp rates,
minimum up/down times, and ru up rates, and reserve holding
chactenstics of individual enerators.
PacifCorp's IR models simulate the operation of its entire systern,
reflectig dispatch/unit commitment, forced/unforced outages,
access to markets, and system reliability and trnsmission
constrints,
PacifiCorp explicitly models nsk associated with uncertin CO2
regulatory costs, wholesale electrcity and natual gas pnce
escalation and volatility, load growt uncertainty, resource
reliability, renewable portfolio stadard requirement uncertinty,
plant constrction cost escalation, and resource affordability. These
. nsks and uncertainties are handled through stochastic rnodeling and
scenanos depicting alternative futues.
In addition to nsk rnodeling, the IRP discusses a number of resource
nsk topics not addressed in the IRP system simulation rnodels. For
example, Chapter 9 covers the following topics: (1) managing
carbon nsk for existing plants, (2) managing gas supply risk, and (3)
procurement delays. Chapter 4 covers similar nsks associated with
trnsmission s stem ex ansion.
The IR modeling incorporates resource expansion constraints tied
to renewable portolio stadads (RS) curently in place for
Washington, Oregon, Califomia, and Utah. (See Chapter 7,
"Representation and Modeling of Renewable Portfolio Standads",
as well as Appendix A for RPS cornpliance report developed for
each resource portfolio assessed for the IR). PacifiCorp also
evaluated vanous CO2 reguatory schernes, including a CO2 tax,
hard cap, and cap-and-trade. Futue modeling enhancernents are
planed for improved representation of state-level resource
re lations.
Cntena pollutat and CO2 emissions under the Clean Air Act are
discussed in Chapter 3. A descnption of PacifiCorp' s rnodeling of
CO2 cost nsk is provided in Chapter 7. Chapter 9 discusses the
im lications of CO2 cost uncertain on resource ac uisition lans.
A descnption of how PacifiCorp classifies and defines energy
conservation is provided in Chapter 6, "Demand-side Resources".
PacifiCorp irnplernented a load forecast range for both capacity
expansion optiization scenanos as well as for stochastic short-
term and long-term vanability. Details concerning the 10ad forecasts
used in the 2011 IR are provided in Chapters 5 and 8, and
Appendix A. Figues 7.4 in Chapter 7 show the range of forecasts
used for capacity expansion modeling. Figues 7.18 though 7.24
show the rage of stochastic 10ads modeled for each load area by
the Monte Carlo roduction cost sirnulations.
PacifiCorp's load forecast methodology employs econornetrc
forecasting techniques that include such economic vanables as
household income, ernployment, and population. See Chapter 5,
"Load Forecast", for a descnption of the load forecasting
methodolo .
44
PACIFiCORP-20ll IRP APPENDIX B - IR REGULATORY COMPLIACE
(3)(a)
(3)(b)
(3)(b)
(3)(c)
(3)(d)
(3)(e)
(3)(f)
(3)(g)
(3)(h)
Plan develops forecasts using methods
that address changes in the number, type
and efficiency of electrcal end-uses.
PIan includes an assessment of
commercially available conservation,
including load rnanagement.
Plan includes an assessment of curently
employed and new policies and
prograrns needed to obtain the
conservation im rovernents.
Plan includes an assessment of a wide
range of conventional and commercially
available nonconventional generating
technologies.
PIan includes an assessment of
transmission systern capability and
reliability (as allowed by curent law).
Plan includes a comparative evaluation
of energy supply resources (includig
transmission and distrbution) and
improvements in conservation using
LRC.
Dernand forecasts and resource
evaluations are integrted into the long
range plan for resource acquisition.
(5)
PIan includes a two-year action plan that
im lements the Ion ran elan.
Plan includes a progress report on the
implementation of the previously filed
plan.
Plan includes description of consultation
with commission staff. (Description not
re uired
Residential sector load forecasts use a statistically-adjusted end-use
model that accounts for equipment satution rates and effciency.
See Appendix A, Load Forecast Details, for a description of the
residential sector 10ad forecastin methodol0 .
PacifiCorp updated the system-wide demand-side management
potential study in 2010, which served as the basis for developing
DSM resource supply cures for resource portfolio modeling. The
supply cures account for technical and achievable (market)
potential, while the IRP capacity expansion rnodel identifies a cost-
effective mi ofDSM resources based on these limits and other
model inputs. As noted above, the 2010 DSM potentials study is
available on PacifiCo's DSM Web site.
A description of the curent status ofDSM programs and on-going
activities to implement curent and new programs is provided in
Chapter 5, Resource Needs Assessment ("Existing Resources").
PacifiCorp considered a wide range of resources including
renewables, cogeneration (combined heat and power), customer
standby generation, power purchases, thermal resources, energy
storage, and transmission. Chapters 6 and 7 document how
PacifiCo develo ed and assessed these technolo ies.
PacifiCorp rnodeled transmission system capability to serve its 10ad
obligations, factorig in updates to the representation ofmajor 10ad
and generation centers, regional transrnission congestion impacts,
importexport availability, external rnarket dynarnics, and
significant transmission expansion plans (See Chapters 4 and 7).
System reliability given transmission capability was analyzed using
stochastic production cost sirnulation and measures of insufficient
energy and capacity for a load area (Energy Not Served and Unmet
Ca aci , res ectivel .
PacifiCorp's capacity expansion optimization rnodel (System
Optimizer) is designed to compare alternative resources-including
trnsmission expansion options-for the least-cost resource mix.
System Optimizer was used to develop numerous resource
portfolios for comparative evaluation on the basis of cost, risk,
reliability, and other performance attbutes. The DSM potentials
study considered improvements in conservation Distrbution
considered alternative transmission ex ansion 0 tions.
PacifiCorp integrates demand forecasts, resources, and system
operations in the context of a systern modeling framework described
in Chapter 7. Portfolio evaluation covers a 20-year period (2011-
2030). PacifiCorp developed its preferred portolio of resources
judged to be least-cost after considerig 10ad requirernents, risk,
uncertinty, supply adequacy/reliability, and governent resource
olicies in accordance with this rule.
See Table 9.1, Chapter 9, for PacifiCorp's 2011 IRP action plan.
A status report on action pIan irnplernentation is provided in the
"Progress on Previous Action PIan Items" section of Chapter 9.
Chapter 2 includes a sumar of the 2011 IR public process,
while Appendix F provides details on specific meetings held.
45
P ACIFICORP - 2011 IRP APPENDIX B - IR REGULATORY COMPLIACE
Plan includes description of completion
of work pIan. (Description not requied)
Not applicable; the IR schedule was modified to accommodate
planng events. See the response to WAC 480-100-238(4).
Table B.6 - Wyoming Public Service Commission IR Standard and Guidelines (Docket 90000-
L07-XO-09)
A
The public comment process employed
as par of the formulation of the utility's
IR, including a description, timing and
weight given to the public process;
The utility's strategic goals and resource
planning goals and preferred resource
portfolioB
C
The utility's ilustration of resource need
over the near-term and long-term
planning horizons;
PacifiCorp's public process is described in Chapter 2. A record
of public meetings is provided as Appendix F.
Chapters 9 and 10 presents the 2011 IRP and transmission
expansion action plans, respectively.
Chapter 8 presents the preferred portfolio. Additionally, the
acquisition path anlysis (Table 9.2) describes alternative
resource strtegies based on trgger events and trends.
See Chapter 5, Resource Need Assessrnent.
D
A study detailing the tyes of resources
considered;
Chapter 6, Resource Options, presents the resource options used
for resource portfolio rnodeling for this IRP.
F
Changes in expected resource
acquisitions and load growt from that
presented in the utility's previous IR;
G The environmental impacts considered;
H Market purchases evaluation;
H Reserve Margin analysis; and
I
Demand-side management and
conservation options;
A comparison of resource changes relative to the 2008 IRP
Update is presented as Table 9.3 in Chapter 9. A chart
comparg the pea load forecasts for the 2008 IRP, 2008 IR
Update, and 2011 IR is included in Appendix A.
Tables and grphs showig CO2 and EPA criteria pollutat
emissions are presented in Chapter 8 and Appendix E.
Modeling offi maket purchases (front offce transactions)
and spot market balancing trnsactions is included in this IR.
PacifiCorp's stochastic loss ofload study and selection ofa
capacity planning reserve magin is included as Appendix 1.
See Chapter 6 for a detailed discussion on DSM and
conservation resource options.
46
PACIFICORP - 2011 IRP APPENDIX C - ENERGY GATEWAY SCENARO PORTFOLIOS
ApPENDIX C - ENERGY GATEWAY SCENARIO
PORTFOLIOS
This appendix provides additional modeling inputs and results for the Energy Gateway transmission
scenarios documented in Chapter 4 of Volume 1. The appendix consists of detailed transmission cost
information incorporated into System Optimizer and portfolio Present Value Revenue Requirements
(PVR) reporting, as well as resource tables indicatig resource differences between the base Energy
Gateway portfolio (developed assuming only the Energy Gateway Central segments are built) and
portfolios developed with incremental Energy Gateway segments,
The Transmission Scenario Analysis section of Chapter 4, Transmission Planning, assesses resource
additions and 20-year present value revenue requirement (PVRR) for various Energy Gateway
scenarios. These scenarios range from a "base case" strategy with the minimal planned transmission
(Scenario 1 ~ including the Populus to Terminal, Mona to Oquirh, and Sigud to Red Butte projects)
to the full "incremental" Energy Gateway strategy (Scenario 7 - including Gateway Central, Gateway
West, Gateway South and west-side projects). The PVRR calculations are for 20-years discounted
back to 2011 dollars assuming a 7.17 percent discount rate in order to be consistent with other IRP
analyses. However, a full financial analysis would assume a 58-year lifecycle and include stochastic
analysis through the Planning and Risk (PaR) model as described in Chapter 7.
The System Optimizer's selection of wind resources for the "Green Resource Futue" used various
Energy Gateway scenarios as input assumptions and then determined general placement of additional
wind resources. Wind resource requirements were assumed at the Waxman-Markey level (20 percent
by 2020). The System Optimizer acts as a screening tool for resource selection but has limited abilty
to take into account transmission constraints and/or operational requirements. This limitation requires
Transmission Planning, in some cases, to choose between planning adequate transmission facilities
appropriate for the resource location, moving wind resources to alternative renewable energy zones, or
both.
PacifiCorp's Transmission Planning Departent did not pre-determine the entie transmission
infrastructue/cost for each scenaro, other than providing the Energy Gateway scenarios as tested
using System Optimizer. However, The Transmission Planing Departent determined whether the
wind resources selected by the System Optimizer had adequate location-based transmission facilities
and, in one scenario, relocated wind resources in consideration of transmission constraints and
operational considerations. Placement and megawatt capacity of wind resources in scenarios 1, 3 and
7 selected by the System Optimizer were left as is; however, resource-location-dependent transmission
was added to accommodate the incremental resources. In scenario 2, The Transmission Planning
Departent determined that some of the resources selected for Wyoming had to be relocated to Uta
due to transmission constraints and operational limits.
47
PACIFICORP - 2011 IRP APPENDIX C - ENERGY GA TEW A Y SCENARIO PORTFOLIOS
West-side wind resource additions under the "Green Resource Futue" (see Table 4.1) for Scenaro 1
range between 871 MW and 1,021 MW of new wind generation primarly in Washington. Figue C.L,
the Western Renewable Energy Zones map, shows "bubbles" in Washington and Oregon where wind
resources are strongest, plus the Energy Gateway Scenario 1 map which shows PacifiCorp's service
area in blue.
Figure C.L- Western Renewable Energy Zones plus Energy Gateway Scenario 1
Wf ~iwWl!'
ÀiÆ¿i
Energ Gateway Transmission Expansion Plan
System Optimizer Scenario I
l.HypnlM1-10
10.100
""100,,50-..:5-__I8.10
.10~100
.. 100.50
A.50---..-MIWi~""-_-_1tnD3_-MisMI.Ml7SO1l~ON(l-_rl
86.5"6.75Hlt1S??_7.1.25_1.25.7.5
Ml7.5
Source: Western Renewable Energy Zones - Phase 1 Report (http.;lwww.westaov.orqJrtp/219)
48
PACIFICORP - 2011 IRP APPENDIX C - ENERGY GATEWAY SCENARIO PORTFOLIOS
Tables C.1 and C.2 outline the line item details for the transmission costs presented in Tables 4.2 and
4.4 of Chapter 4. Given that Scenario 1 includes no incremental transmission capacity on the west side
and lacked available capacity in this region, new transmission additions would be required to bring up
to 1,021 MW of west-side wind generation to customer load centers in Oregon, Washington and
California. PacifiCorp estimated that $1.5 bilion (20- Year PVRR) in new west-side transmission
investment would be required to deliver this energy to customers under the Green Resource Scenario. 2
2 See the west side line items in Table C.l.
49
P ACIFICORP - 2011 IRP APPENIX C - ENERGY GATEWAY SCENARO PORTFOLIOS
Table C.i - Transmission Cost Details, Green Resource Future
$1.118 $920 $945 $1,118 $920 $945 $738
295 295 295 295 295 295 295
9 9 9 9 9 9 9
0 657 657 0 657 657 657
0 0 477 0 0 477 307
0 0 0 0 0 0 270
0 0 0 0 0 0 207
ndet Transsio
142 107 ios 45 142 107 105 45
0 475 0 0 0 475 0 0
1,503 0 0 0 1,503 0 0 0
Wheeli Char e Soutwest UT - Mea NY 35 35 35 36 35 35 35 35
Total (20-year PVR) 'i $3,103 $2,499 $2,524 $2,564 $3,103 $2,499 $2,524 $2,563
$1,776 $3,329 $460 $5,888 $1,776 $3,329 $4.60 $5,888
ndnt Transmisio:
$1,118 $920 $945 $738 $1,118 $920 $945 $738
295 295 295 295 295 295 295 295
9 9 9 9 9 9 9 9
0 657 657 657 0 657 657 657
0 0 477 307 0 0 477 307
0 0 0 270 0 0 0 270
0 0 0 207 0 0 0 207
ndent Transmisio
142 107 105 45 142 107 105 45
0 475 0 0 0 475 0 0
1,503 0 0 0 1,53 0 0 0
Soutest UT - Me NY 35 35 35 35 36 36 36 36
Total (20-year PVRR) 11 $3,103 $2,499 $2,524 $2,563 $3,104 $2,500 $2,525 $2,564
$1,776 $3,329 $4,60 $5,888 $1,776 $3,329 $4,60 $5.888
ndent Transmision:
337 253 248 I 337 253 248 107
0 1,124 0 0 0 1,124 0 0
2,802 0 0 0 2,802 0 0 0
$4,915 $4,706 $4,857 $5,995 $4,915 $4,706 $4,857 $5,995
If Westside ResolDce Loation Dependent Transsio assind to be in-serve the begig of year 2016.11 Transmision deprciable assets have a 58-year bok lie, however the present vahi revenue requment were hased on 20-years of fu trnssio costs usin a 7.17"10 dicoi
rate in order to be conistent wi 1RP date parameters.
31 Gross capitl estites came frm standard trnsmision base assemblis priced in 200 except for the Pop - Terml segmnt where 2010 forecaste completi costs wer used
50
P ACIFICORP - 2011 IRP APPENDIX C - ENERGY GA TEWA Y SCENARO PORTFOLIOS
Table C.2 - Transmission Cost Details, Incumbent Resource Future
$1,118 $920 $945 $738 $1,118 $920 $945 $738
295 295 295 295 295 295 295 295
9 9 9 9 9 9 9 9
0 657 657 657 0 657 657 657
0 0 477 307 0 0 477 307
0 0 0 270 0 0 0 270
0 0 0 207 0 0 0 207
ndet Transmisio
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Wheeli Char e Sontwes UT-Mea NY 35 35 35 35 35 35 35 35
Tota (20-year PVR) 11 $1,458 $1,916 $2,419 $2,518 $1,457 $1,916 $2,419 $2,518
$1,776 $3,329 $4,60 $5,888 $1,776 $3,329 $4,60 $5.888
ndent Transmisio:
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
$1,776 $3,329 $4,609 $5,888 $1,776 $3,329 $4,609 $5,888
$1,118 $920 $945 $738 $1,118 $920 $945 $738
295 295 295 295 295 295 295 295
9 9 9 9 9 9 9 9
0 657 657 657 0 657 657 657
0 0 477 307 0 0 477 307
0 0 0 270 0 0 0 270
0 0 0 207 0 0 0 207
ndnt Transmisio
0 0 0 0 142 107 105 45
0 0 0 0 475 0 0
0 0 0 0 0 0 0 0
Wheeli Char e 35 35 35 35 36 36 36 36
Tota (20-year PVR) 11 $1,458 $1,916 $2,419 $2,518 $1,600 $2,499 $2,525 $2,564
$1,776 $3,329 $4.60 $5,888 $1.776 $3,329 $4,609 $5,888
ndent Transmisio:
0 0 0 0 337 254 248 107
0 0 0 0 1,123 0 0
0 0 0 0 0 0 0 0
$1,776 $3,329 $4,609 $5,888 $2,113 $4,706 $4,857 $5,995
11 Transmisio depreciable assets have a 58-year bok lie. however thc present valn revenne requiements were based on 20-years of fu transmisio costs usin a 7.17% dicou
rate in order to be conistent wit IRP date pa1Ìinters.2! Gross capil estites came from standard trnsmisio base assemblis prced in 200 except for the Poplu - Tennl segmnt where 2010 forcasted comletin costs were
used.
51
PACIFICORP - 2011 IRP APPENIX C - ENERGY GATEWAY SCENARO PORTFOLIOS
This section presents System Optimizer portfolio output tables for the Energy Gateway transmission
scenaros discussed in Chapter 4, Transmission Planing. Table C.3 sumarizes the input assumptions
used for developing each Energy Gateway portfolio. Table C.4 reports the portfolio PVRRs, indicating
post-model-ru adjustments for transmission costs and reversal of the stochastic value adjustment
applied to CCCT resources. (See Chapter 7 for a discussion of this adjustment). Table C.5 consists of
the resource capacity difference tables. The base Energy Gateway scenario is shown first, followed by
the resource difference tables for scenarios with the matching input assumptions. For example,
resource differences for scenarios EG2, EG3, and EG4 are shown with respect to EG 1. Portfolios
designated with the "WM" suffi correspond to the Green Resource Futue strategy outlined in
Chapter 4.
52
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87
llACIFICORP - 2011 IRP APPENDIX D - DETAIL CAPACITY EXPANSION RESULTS
ApPENDIX D - SYSTEM OPTIMIZER DETAILED
MODELING RESULTS
This appendix reports the detailed portfolio resource selection tables for each of the scenaro
development cases outlined in Chapter 7. These tables are outputs from the System Optimizer
model used durng portfolio development.
89
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13
1
PACIFICORP - 2011 IR APPENDIX D - DETAIL CAPACIT EXPANSION RESULTS
Figue D.l shows the Preferred Portfolio added to the medium C02 emission profile chart from
Chapter 8.
Figure D.I - Core Cases: C02 Emission Prorie for Medium C02 Tax Costs
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132
PACIFiCORP-20ll IRP APPENDIX E - STOCHASTIC SIMULATION RESULTS
ApPENDIX E - STOCHASTIC PRODUCTION COST
SIMULATION RESULTS
This appendix reports additional results for the Monte Carlo production cost simulations
conducted with PacifiCorp's Planing and Risk (paR) model, including certin sensitivity
portfolios: coal utilization cases 20 through 24, and high/low economic growth cases 25 and 26.
These results supplement the data presented in Chapter 8 of the main IRP document. The results
presented include the following:
. Stochastic mean PVR versus upper-tail mean PVRR scatter-plot diagrams that include all
CO2 hard cap portfolios
. The full complement of stochastic risk and other portfolio performance measures for the
portfolios simulated using PaR.
. Stochastic mean PVRR component cost details for the portfolios.
Mean versus Upper-tail Mean PVRR Scatter-plot Charts
The following set of scatter-plot charts incorporates all 19 core cases. The scatter-plot charts in
Chapter 8 excluded a number of the CO2 emission hard cap portfolios due to high PVRs that
impacted axis scaling and legibility of the data points.
133
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7
P ACIFICORP - 2011 IR APPENDIX E - STOCHASTIC SIMATION RESULTS
Table E.l- Stochastic Mean PVRR by C02 Tax Level, Core Case Portolios
Case 1
Case 2
Case 3
Case 4
Case 5
Case 6
Case 7
Case 8
Case 9
Case 10
Case 11
Case 12
Case 13
Case 14
Case 15
Case 16
Case 17
Case 18
Case 19
26,623
26,424
26,616
27,002
27,000
27,008
26,650
27,122
27,122
28,555
28,172
29,082
29,182
29,073
27,591
28,441
32,369
30,957
28,108
35,567
35,462
35,488
35,681
35,585
35,516
35,527
35,841
35,738
36,838
36,816
37,103
37,009
37,167
35,560
36,181
38,539
37,206
36,679
34,892
34,768
34,835
35,139
35,087
35,024
34,868
35,271
35,231
36,362
36,154
36,678
36,789
36,698
34,969
35,328
38,036
35,791
36,128
32,360
32,218
32,313
32,607
32,558
32,516
32,348
32,744
32,697
33,918
33,714
34,288
34,327
34,312
32,707
33,317
36,315
34,651
33,638
Table E.2 - Stochastic Risk Results by C02 Tax Level, Core Case Portfolios
Case 1 1,948 23,551 29,799 30,808
Case 2 2,029 23,289 29,825 30,836
Case 3 1,934 23,563 29,796 30,752
Case 4 1,954 23,892 30,191 31,139
Case 5 1,974 23,836 30,194 31,092
Case 6 1,919 23,901 30,093 30,938
Case 7 1,915 23,604 29,784 30,727
Case 8 1,930 24,066 30,277 31,232
Case 9 1,918 24,031 30,239 31,140
Case 10 1,515 25,956 30,751 31,556
Case 11 1,550 25,530 30,601 31,267
Case 12 1,351 26,681 30,984 31,603
Case 13 1,337 26,817 31,096 31,715
Case 14 1,368 26,678 31,099 31,678
Case 15 3,094 22,909 32,060 33,036
Case 16 3,852 22,803 34,100 35,053
Case 17 3,702 27,139 37,948 38,792
138
PACIFiCORP-20ll IRP APPENDIX E - STOCHASTIC SIMUATION RESULTS
Case 1 3,538 30,185 40,773 41,748
Case 2 3,629 29,986 40,833 41,897
Case 3 3,530 30,116 40,643 41,639
Case 4 3,535 30,308 40,860 41,801
Case 5 3,588 30,125 40,857 41,685
Case 6 3,537 30,112 40,621 41,470
Case 7 3,497 30,198 40,653 41,578
Case 8 3,492 30,527 40,943 41,929
Case 9 3,485 30,425 40,852 41,709
Case 10 2,992 32,117 40,806 41,749
Case 11 3,031 32,052 41,074 41,787
Case 12 2,779 32,666 40,627 41,417
Case 13 2,710 32,664 40,457 41,270
Case 14 2,794 32,693 40,772 41,597
Case 15 3,366 30,376 40,526 41,375
Case 16 4,362 29,774 42,618 43,469
Case 17 4,271 32,485 44,974 45,819
Case 18 5,419 29,490 45,353 46,097
Case 19 3,378 31,435 41,467 42,276
Case 1 3,109 30,050 39,270 40,465
Case 2 3,204 29,836 39,513 40,542
Case 3 3,103 30,012 39,230 40,360
Case 4 3,115 30,300 39,523 40,667
Case 5 3,158 30,177 39,517 40,653
Case 6 3,111 30,173 39,350 40,445
Case 7 3,076 30,080 39,198 40,342
Case 8 3,080 30,479 39,618 40,747
Case 9 3,070 30,426 39,534 40,666
Case 10 2,573 32,206 39,619 40,718
Case 11 2,612 31,976 39,524 40,592
Case 12 2,390 32,783 39,859 40,452
139
PACIFICORP - 2011 IR APPENDIX E - STOCHASTIC SIMATION RESULTS
Case 13
Case 14
Case 15
Case 16
Case 17
Case 18
Case 19
2,365
2,391
2,806
3,543
3,381
4,210
2,960
32,896
32,821
30,683
29,877
32,874
29,456
31,450
39,979
39,968
39,117
40,405
42,757
41637
40,155
40,576
40,528
40,197
41,519
43,692
42,791
41,203
Table E.3 - Carbon Dioxide and Other Pollutant Emissions
1 941,203 753 1,092 653 939 5,700 801,497 641 912 5,492
2 943,810 754 1,093 656 94 5,721 807,175 64 918 5,516
3 937,91 751 1,087 649 932 5,681 796,784 638 906 5,473
4 930,958 745 1,075 643 918 5,881 787,44 631 891 5,697
5 929,942 740 1,066 635 906 5,813 782,864 622 877 5,637
6 924,985 737 1,061 631 90 5,791 777,60 619 872 5,618
7 938,503 752 1088 650 933 5,683 797,611 638 907 5,476
8 931,497 748 1,079 64 923 5,912 789,817 635 897 5,722
9 930726 745 1074 642 916 5860 785 834 630 889 5,683
10 917,430 747 1,076 641 912 5,834 764,891 627 882 5,648
11 932,265 756 1095 651 934 5,672 784,279 638 906 5,462
12 907,039 741 1,067 631 898 5,792 751,203 618 869 5,595
13 906,120 742 1,068 633 90 5,735 750,46 620 871 5,559
14 911,849 742 1,067 633 900 5,771 755,99 618 869 5,591
15 814,681 645 916 670 958 6,029 800,509 639 905 5,736
16 770,990 60 854 626 890 5,766 746,912 586 828 5,434
17 673,465 543 766 566 803 5;377 651,663 525 745 5,062
18 677,562 506 709 568 804 5,447 682,971 516 723 5,068
19 922,446 740 1,068 636 911 5,610 779,075 623 883 5;393
Table E.4 - Cumulative to-year Customer Rate Impact, Core Case Portfolios
1 22.6%39.6%33.6%31.9%3
2 22.3%39.4%33.3%31.7%1
3 22.6%39.5%33.5%31.9%2
4 22.9%39.8%33.8%32.2%6
5 22.7%39.6%33.6%32.0%5
6 23.3%39.9%34.0%32.4%9
7 22.7%39.6%33.6%31.9%4
8 23.0%40.0%33.9%32.3%8
9 22.9%39.9%33.8%32.2%7
10 27.3%43.4%37.8%36.2%17
11 26.3%42.6%36.9%35.2%13
140
P ACIFICORP - 2011 IRP ApPENDIX E - STOCHASTIC SIMUATION RESULTS
12 26.9%43.0%37.5%35.8%16
13 26.3%42.6%36.9%35.2%14
14 28.3%44.0%38.7%37.0%18
15 24.1%39.6%33.8%32.5%10
16 26.0%39.9%35.3%33.7%11
17 33.4%45.0%41.6%40.0%19
18 29.5%40.6%37.1%35.7%15
19 25.5%42.3%36.3%34.7%12
Figure E.5 - Average Annual Energy Not Served (2011 - 2030), $19 CO2 Core Case
Portfolios
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141
P ACIFICORP - 2011 IR APPENDIX E- STOCHASTIC SIMUATION RESULTS
Table E.5 - Loss of Load Probabilty for a Major (;: 25,000 MWh) July Event, Core CasePortfolios '
7%7%7%7%7%7%7%7%7%7%
6%6%6%6%6%6%6%6%6%6%
8%8%8%8%8%8%8%8%8%8%
10%10%10%10%10%10%10%10%10%10%
13%12%12%12%12%12%12%12%12%13%
10%10%10%10%10%10%10%10%10%10%
19%19%19%19%19%19%19%19%19%19%
27%27%27%27%27%27%27%27%27%27%
26%26%26%26%26%26%26%25%26%25%
21%21%21%21%21%21%21%21%21%21%
24%24%24%24%24%24%24%24%24%24%
21%21%21%21%21%21%17%21%18%19%
9%13%16%16%16%16%6%16%15%16%
21%18%27%17%33%33%16%33%27%33%
18%14%23%21%17%26%23%26%26%26%
17%16%13%13%14%14%20%13%21%20%
24%27%27%28%19%16%28%19%28%28%
31%31%24%25%16%16%30%24%25%23%
39%39%33%37%24%24%38%30%24%21%
50%51%49%39%35%35%50%47%28%29%
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19%19%19%19%19%19%19%19%19%
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25%25%25%25%25%26%25%25%26%
21%21%21%21%21%21%21%21%21%
24%20%24%24%24%24%24%24%24%
18%13%19%21%21%21%21%6%22%
13%11%14%16%16%16%16%2%16%
25%27%24%33%32%19%32%32%32%
15%15%15%19%26%17%14%26%26%
15%16%16%12%13%11%13%21%14%
28%28%23%12%14%27%25%27%23%
29%29%23%27%18%20%20%22%20%
36%37%32%33%28%32%27%32%37%
50%46%36%36%43%39%43%35%48%
142
PACIFICORP - 2011 IRP APPENDIX E - STOCHASTIC SIMUATION RESULTS
Table E.6 - Average Loss of Load Probabilty During Summer Peak
143
P ACIFICORP - 2011 IR APPENDIX E - STOCHASTIC SIMUATION RESULTS
The following tables report stochastic production cost modeling results for Cases 21 through 24
(coal utilization sensitivities) and Cases 25 and 26 (low and high economic growth sensitivities).
Note that the Case 20 coal utilization portfolio (medium C02 tax and gas prices) did not result in
any coal plant replacements, so the Company did not consider it wortwhile to conduct a
stochastic production cost simulation with ths portolio. Similarly, the Case 27 portfolio, which
assumed high peak loads drven by one-in-ten peak load producing temperatues, was not
sufficiently different in resource mix relative to the high economic growth portfolio to warant
stochastic production cost modeling.
Table E.7 - Stochastic Mean PVR by CO2 Tax Level, Sensitivity Portfolios
Table E.8 - Stochastic Risk Results by C02 Tax Level, Sensitivity Portolios
144
P ACIFICORP - 2011 IRP APPENDIX E - STOCHASTIC SIMUATION RESULTS
145
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1
P ACIFICORP - 2011 IR APPENDIX F - PUBLIC INPUT PROCESS
ApPENDIX F - THE PUBLIC INPUT PROCESS
A critical element of this resource plan is the public input process. PacifiCorp has pursued an open
and collaborative approach involving the Commssions, customers and other stakeholders in
PacifiCorp's planning process prior to making resource planning decisions. Since these decisions can
have significant economic and environmental consequences, conducting the resource plan with
transparency and full participation from Commissions and other interested and affected parties is
essentiaL.
The public has been involved in this resource plan from its earliest stages and at each decisive step.
Paricipants have both shared comments and ideas and received information. As reflected in the report,
many of the comments provided by the partcipants have been adopted by PacifiCorp and have
contributed to the quality of this resource plan. PacifiCorp wil adopt fuher comments going forward,
either as elements of the Action Plan or as futue refinements to the planning methodology.
The cornerstone of the public input process has been full-day public input meetings held
approximately thoughout the year-long plan development period. These meetings have been held
jointly in two locations-Salt Lake City, Utah and Portland Oregon-using telephone and video
conferencing technology.
IR public process continued with state stakeholder dialogue sessions from mid-June through August
2010. These goal of these sessions, targeting a state-specific audience, were to (1) captue key
resource planning issues of most concern to each state, and discuss how these can be tackled from a
system planning perspective, (2) ensure that stakeholders understand PacifiCorp's planing principles
and the logic behind its planing process, and (3) set expectations for what can be accomplished in the
curent IRPlbusiness planning cycle. These State focused meetings contiued to enhance interaction
with stakeholders in the planning cycle, and provided a foru to directly address stakeholder concerns
regarding equitable representation of state interests durng general public meetings.
As far as agenda setting is concerned, PacifiCorp solicited recommendations from the state
stakeholders in advance of the session, as well as allowing open time to ensure that participants had
adequate time for dialogue. Some follow-up activities arising from the sessions were addressed in
subsequent public meetings.
The 2010 public input meetings were augmented by a series of focused technical workshops to provide
an opportity to discuss complex topics for a multi-state utility in more detaiL.
Among the organizations that were represented and actively involved in this collaborative effort were:
Commissions
· Idaho Public Utilities Commission
· Oregon Public Utilties Commission
153
P ACIFICORP - 2011 IR APPENDIX F - PUBLIC INUT PROCESS
. Public Service Commission of Uta
. Washington Utilities and Transporttion Commssion
. Wyomig Public Service Commission
Intervenors
. Attorney General of Washington
. Brigham Young University
. Citizen's Utilty Board of Oregon
. Committee for Consumer Services State of Uta
. ECOS Consulting
. Encana Corporation
. enXco
. Energy Trust of Oregon
. Energy Strategies, LLC
. HEAL Utah and Utah Physicians for a Healthy Environment
. Health Environment Allance of Utah (HEAL)
. Horizon Wind Energy
. Iberdrola
. Industrial Customers of Northwest Utilities
. Interwest Energy Allance
. Kennecott
. Mountain West Consultig, LLC
. Northwest Power and Conservation Council
. Northwest Pipeline GP
. NW Energy Coalition
. Oregon Departent of Energy
. Powder River Basin Resource Council
. Renewables Northwest Project
. Salt Lake City
. Salt Lake Community Action Progrm
. Southwest Energy Efficiency Project
. Sierra Club, Utah Chapter
. U.S. Deparent of Energy - Intermountain Clean Energy Application Center
. U.S. Departent of Energy - Northwest Clean Energy Application Center
. Utah Association of Energy Users
. Utah Clean Energy Allance
. Utah Division of Air Quality
. Uta Division of Public Utilities
. Utah Energy Office
. Utah Geological Surey
. Wasatch Clean Air Coalition
. Western Resource Advocates
. West Wind Wires
. Wyoming Industrial Energy Consumers
154
P ACIFICORP - 2011 IRP APPENDIX F - PUBLIC INPUT PROCESS
. Wyoming Offce Of Consumer Advocacy
Others
. A vista Utilities
. Cadmus Group Inc.
· GDS Associates
. Idaho Power Company
· John Klingele (Washington Customer)
· Portland General Electrc (PGE)
PacifiCorp extends its gratitude for the time and energy these participants have given to the resource
plan. Your participation has contrbuted significantly to the quality of this plan, and your continued
participation will help as PacifiCorp strives to improve its planning efforts going forward.
PacifiCorp hosted five full-day public input meetings, two half day meetings, one conference call and
six state meetings during the 2010. Durng the 2011 IRP process presentations and discussions
covered various issues including inputs and assumptions, risks, modeling techniques, and analytical
results. Below are the agendas from the public input meetings and the technical workshops.
General Meetings
April 28, 2010
· IRP Group and Support Team
· Discussion on the wind integration study methodology white paper
· IRP Regulatory Compliance (2008 IRP / 2011 IRP)
· IRP Preparation Schedule and Public Process
. IRP Modeling Plan and Initiatives
. 2008 IRP Update
August 4,2010
· Demand-side management / distrbuted generation
· Supply-side Resources
· Planning Reserve Margin (PRM) analysis
· Proposed portfolio development cases
October 5, 2010
. IRP Schedule Update
· Energy Gateway Transmission Constrction Update and Evaluation
. Load Forecast
· Hedging Strategy
. Market Reliance Analysis
· Capacity Load & Resource Balance
· Portfolio Development Cases
155
P ACIFICORP - 2011 IR APPENDIX F - PUBLIC INUT PROCESS
December 15,2010
. Planning Reserve Margin and LOLP
. Update on Assumptions
. Load Forecast Scenarios
. DSM Supply Cures
. Update Load and Resource Balance
. Preliminar Results for Core Cases and Transmission
January 27,2011
. Solar photovoltaic resource modeling
January 31,2011
. Review of System Optimizer Core Case Results - Cases i to 19
February 23,2011
. Stochastic production cost modeling results
. preferred portfolio selection
. coal utilization study results
March 23, 2011
. Preferred portfolio discussion,
. Remaining portfolio sensitivity results, and
. the IRP action plan
State Meetings
June 16,2010 - Oregon / California
. Evaluating distrbution efficiency potential
. Wind integration study
. Transmission financial analysis
. Assumptions update for portolio analysis / All-source RFP
. Intermediate-term Market Puchases
. Out-year resource selection
. Enhanced regulatory impact modeling
. Use of carbon dioxide emissions for portfolio performance scorig
. Open Discussion Items - Sma Grd and PacifiCorp Modeling
June 29, 2010 - Utah
. Renewable/non-traditional Resource Evaluation
Wind integration study
156
PACIFICORP - 2011 IRP APPENDIX F - PUBLIC INPUT PROCESS
Distrbuted solar
Resource modeling and characterization
Sensitivity analysis of incentive programs (e.g., level of incentive needed to make
distrbuted solar cost-effective)
Hybrid intennittent/storage technologies
Commercial geothermal potential study
. DSM Potential Study
Treatment of achievable potential adjustments
Application of the Utility Cost Test
. Market Risk Assessment
Price hedging strategy
Inclusion of hedging costs in portfolio resources
Sensitivity analysis of hedging strategies to minimize costs and risks for customers
Market purchase risk assessment
WECC Power Supply Assessment
Stochastic simulation and risk analysis
. Resource Adequacy
Planning reserve margin evaluation
Sensitivity analysis of Energy Not Served (ENS) price; i.e., flat vs. tiered approach
Hydro sustained peaking capability
Treatment of planned resources
. Load Forecasting
GDS Consulting recommendations for the 2008 IRP
Load forecast scenarios
Stadalone load forecast report
Stochastic parameter estimation
· Model Training
July 28, 2010 - Idaho
· 2008 IRP Acknowledgement Letter
· Discount rate impact on resource timing and selection
· Wind integration costs - justification and stochastic modeling support
· Quantifying Renewable Portfolio Standard costs and other jursdictional mandates
· Portfolio selection process and weighting scheme
August 11,2010- Wyoming
· ENS in Portfolio Modeling
. Planning Reserve Margin
· C02 Modeling: Tax versus Cap-n- Trade
. Supply-side Option Table
. LOLP
. Weighting Schemes
157
P ACIFICORP - 2011 IR APPENDIX F - PUBLIC INPUT PROCESS
Durg the course of the public input meetigs, certin concerns or questions needed additional
follow-up from PacifiCorp. These questions or issues were taken off-line and addressed in a meeting
report or ata subsequent public input meeting or workshop.
PacifiCorp distrbuted the draft document materials on February 23 and March 7, 2011 for public
review. Public comments were requested by March 24, 2011. Parties that submitted comments
include:
. Encana Corporation
. HEAL Utah and Utah Physicians for a Healthy Environment
. Interwest Energy Allance
. Powder River Basin Resource Council
. Renewable Northwest Project
. SieITa Club
. Uta Association of Energy Users
. Utah Clean Energy
. Uta Public Service Commission Staff
. U.S. Departent of Energy - Nortwest Clean Energy Application Center
. U.S. Deparent of Energy - Intermountain Clean Energy Application Center
. Washington Utility and Transporttion Commission
. Western Resource Advocates
Many of the clarifications and information requested through the wrtten comments, verbal
suggestions from the March 23,2011 conference call, and data requests, have been incorporated into
the final version of the IRP.
PacifiCorp's IRP internet website contains many of the documents and presentations that support
recent Integrated Resource Plans. To access it, please visit the company's website at
htt://www.PacifiCorp.com click on the menu "Energy Sources" and select "Integrated Resource
Planning" .
PacifiCorp requests that any informal request be sent in writing to the following address or email
address below.
158
PACIFICORP - 2011 IR ApPENDIX F - PUBLIC INPUT PROCESS
PacifiCorp
IRP Resource Planning Department
825 N.E. Multnomah, Siiite 600
Portland, Oregon 97232
Electronic Email Address:
IRP(ã)PacifiCorp.com
Phone Number:
(503) 813-5245
159
P ACIFICORP - 2011 IR APPENDIX G - HEDGING STRATEGY
ApPENDIX G - HEDGING STRATEGY
This appendix addresses two Public Service Commission of Utah analysis requirements
pertaining to price hedging.
· "At a minimum, we direct the Company to include the costs of hedging in its IRP
analysis of resources that rely on fuels subject to volatile prices."
. "We also direct the Company to perform sensitivity analysis to determine a hedging
strategy which minimizes costs and risks for customers.,,3
To address these requirements, this appendix presents a comparison among hedging strategies to
demonstrate that while the expected value of all hedging strategies is the same, different
strategies have differing risk profiles. The consequence is that selection of a hedging strategy is
made not by expected outcome but by risk tolerance, and that hedging outcomes net to a zero
expected value on a long-term basis.
Purpose of Hedging
Hedging is done solely for the purose of limiting financiallosses due to unfavorable wholesale
market price changes. The Company has exposure to power and natual gas wholesale market
price changes due to its responsibility to serve retail load and to economically dispatch its
resources. The Company cannot avoid such exposure but can reduce it though hedging. A long
forward power position occurs when the amount of energy anticipated to be economically
produced by the Company's resources exceeds the amount of energy forecast to be consumed by
retail customers, and the Company risks financialloss if wholesale power market prices fall. A
short forward natual gas position occurs when the Company's natural gas generation is expected
to economically convert natual gas to power and the Company risks financial loss if wholesale
natual gas market prices rise. The Company may also have short power positions and, attimes,
long natual gas positions. All of these open positions result in price risk.
Need for Hedging
Perfect foresight of futue wholesale market prices is unattainable by any hedging entity,
including the Company. While the Company may have a view of where it believes prices are
heading - up, down, or no change - it does not have the ability to predict without error such
price changes. The Company has incentive to protect against unfavorable wholesale market
3 Public Service Commission of Utah, "In the Matter of the Acknowledgment of PacifiCorp' s Integrated Resource
Plan", Report and Order, Docket No 09-2035-01, April 1, 2009, p. 30.
161
PACIFICORP - 20 11 INTGRATED RESOURCE PLAN APPENDIX G - HEDGING STRTEGY
price changes and does so by hedging to reduce the range of net power cost outcomes for any
wholesale market price changes.
Impact of Hedging and Hedging Costs
Hedging modifies the potential losses and gains in net power costs associated with wholesale
market price changes. Increased hedging reduces both the potential losses and potential gains.
Therefore, if the Company has a low risk tolerance it would hedge a greater amount than if it has
a high risk tolerance. Hedging does not, however, modif the expected outcome of net power
costs associated with wholesale market price changes. Any hedging program, whether it utilizes
fixed-price forward or option products, would result in the same expected net power costs from
the perspective of the time the hedges are transacted. Historical gains and losses due to hedging
are only indicative of potential opportity costs for having pursued an alternate hedging
strategy once the outcome is already known.
With respect to hedging costs, which the Company defines as hedging program expenses, Figue
G.1 shows the trend in the Company's annual costs for both electrcity and natural gas hedging
activities (broker fees). As can be seen, the hedging costs are too small to be used as a
meaningful distinguishing factor among resources and portfolios.
Figure G.l- PacifCorp's Annual Electricity and Natural Gas Hedging Costs
Annual Hedging Costs, Electricity
700,000
600,000
500,000
f400,000.!
8 300,000
200,000
100,000
o
2007 2008 2009 2010
!I Hedging Costs, Electricity
162
PACIFICORP - 2011 IR APPENDIX G - HEDGING STRTEGY
Annual Hedging Costs, Natural Gas
10,000
8,000
II 6,000...!Õc 4,000
2,000
0
2007
$8,746
$627
2008 2009 2010
li Annual Hedging Costs, Natural Gas
Hedge Products
The basic hedge products available to the company are. fixed-price forwards and, to a lesser
extent, vanila options. All basic hedging strategies are in theory implementable using
combinations of these two tyes of products. In practice, however, the Company almost
exclusively employs fixed-priced forwards. This is because forward markets relevant to the
Company are liquid, and the costs have been determined to be recoverable.
In contrast, options have a number of disadvantages to the Company. There are not liquid
regional options markets, meaning that any options available have a high additional cost
reflected in the spread between the buyer's bid price and the seller's ask price. There is an active
natual gas options market at Henr Hub, but the price of natual gas in the Company's region
does not necessarly move in lock-step with the price of natual gas at Henr Hub. This is known
as basis risk, and is undesirable. Finally, because options require payment up-front for benefits
that mayor may not occur in the future, it is not clear that the Company would be able to recover
the cost of unexercised options in rates.
No "Best" Hedging Strategy
Among the myriad conceivable hedging strategies there is no purely objective optimization
method resulting in the best strategy. Determining a strategy that is best for the Company is
necessarily in part a subject evaluation. Parameters that must be considered are market liquidity,
tyes and availability of desired hedge products, customer risk tolerance, and cost of hedge
program management, to name a few.
163
P ACIFICORP - 20 11 INTEGRATED RESOURCE PLAN APPENDIX G - HEDGING STRTEGY
Various hedging programs have been simulated to demonstrte the impact to the range of net
power cost outcomes and to demonstrate there is no change to the expected outcome. The
measurement of range of net power cost outcomes is the "to-expir value-at-risk" distrbution.
This TEVaR distribution is a statistically-generated distrbution of outcomes that is wider or
narrower based upon the aggregate volatility of the combined power and natual gas portfolio.
Inasmuch as being short natual gas natually offsets being long power, one would expect the
TEVaR distrbution of a long-power/short-natual gas portolio to be significantly narrower than
the distrbution of either individual component.
Five portfolios were simulated using Monte Carlo technique to calculate to-expir value-at-risk.
The first portfolio, entitled "Reference portfolio," is comprised of a 500 average MW power long
position and a (100,000) MMtuday natual gas short position. This represents the Company's
hypothetical combination of retail load, economic generation and transactions that partially
hedge the position. The long power and short natual gas positions are largely offsetting. This is
used as the reference portfolio for the following scenario analyses.
The second portfolio, entitled "less hedged," is comprised of 625 average MW power long
position and (125,000) MMtuday natual gas short position. Relative to the reference
portfolio, this demonstrates the change in risk profile of a portfolio with 25% less hedged
position. In this portfolio, there are 125 average MW fewer hedge transactions resulting in more
power lengt, and 25,000 MMBtuday fewer hedge trnsactions resulting in a shorter natual gas
short position.
The third portfolio, entitled "more hedged," is comprised of 375 average MW power long
position and (75,000) MMBtuday natual gas short position. Relative to the reference portfolio,
this demonstrates the change in risk profile of a portfolio with 25% more hedged position. In
this portfolio, there are 125 average MW more hedge transactions resulting in less power length
and 25,000 MMBtuday more hedge transactions resulting in less short natual gas position.
The fourh portfolio, entitled "Hedge only power," is comprised of a fully hedged power position
and (100,000) MMBtuday natual gas short position. Relative to the reference portfolio, this
demonstrates hedging all power but no natual gas.
The fifth portfolio, entitled "Hedge only natual gas," is comprised of a 500 average MW power
long position and a fully hedged natual gas position. Relative to the reference portfolio, this
demonstrates hedging all natual gas but no power.
Charts of the results are shown below (Figues G.2 through G.5). In addition, for ease of
comparson among portfolios, Table G.1 below shows the expected value, the fifth percentile
outcome (very unfavorable prices), and the 95th percentile outcome (very favorable prices).
These values shown are relative, so that $0 expected value indicates the potential change in
portfolio value due to market price changes is expected to be neutraL This is the statistical
164
P ACIFICORP - 2011 IRP APPENDIX G - HEDGING STRATEGY
equivalent of the earlier assertion that hedging can only reduce the range of potential net power
costs, but canot reduce expected net power costs. .
The reference portfolio, shown in blue in each of the four chars, has an unsymmetrcal fift and
95th percentile result due to the likelihood that prices may increase more than decrease, and due
to the reference portfolio being net short. A log-normal price distrbution is used to represent
this effect.
In the less hedged sample portfolio, both the power and natual gas volumes are 25 percent larger
than the reference portfolio. Conversely in the more hedged sample portfolio, both the power and
natual gas volumes are 25 percent smaller than the reference portfolio. As expected, the less
hedged portfolio shows a wider distrbution of outcomes representing a higher risk to price
changes. Similarly, the more hedged portfolio shows a narrower distrbution.
The "hedge only power" portfolio shows a much wider distrbution due to the severe reduction in
the natual offset between power and natual gas in the reference portfolio. The "hedge only
natual gas" has a similar distrbution. Of note is the 5th percentile "hedge only power" portfolio
is much greater downside than the "hedge only natul gas" portfolio, and this js due to the log-
normal prices.
Table G.l - Comparison of Multiple Sample Portfolios
($40)$0 $27
($48)$0 $33
($29)$0 $20
($92)$0 $66
($48)$0 $62
165
P ACIFICORP - 20 11 INTGRATED RESOURCE PLAN APPENDIX G - HEDGING STRTEGY
Figure G.2 - Reference Portfolio versus Less Hedged Portolio
Reference Portolio vs Less Hedged Portfolio
~~:eII..o..Q.
II Reference Portfolio
m Less Hedged Portfolio
($150)($100)($50) $0 $50
Potential Change in Value ($M)
$100 $150
In the "Reference Portfolio versus Less Hedged Portfolio" chart, the less hedged portfolio has a
wider distribution of results than the reference portfolio. While both portfolios have an expected
value of zero over all potential scenarios, the less hedged portfolio wil retu a wider range of
outcomes.
166
P ACIFICORP - 2011. IRP APPENDIX G - HEDGING STRATEGY
Figure G.3 - Reference Portfolio versus More Hedged Portfolio
~
:aII.ao..Cl
m Reference Portfolio
El More Hedged Portfolio
($150)($100)($50) $0 $50
Potential Change in Value ($M)
$100 $150
In the "Reference Portfolio versus More Hedged Portfolio", the more hedged portfolio has a
tighter distribution of results than the reference portfolio. While both portfolios have an expected
value of zero over all potential scenarios, the more hedged portfolio wil retu a tighter range of
outcomes.
167
P ACIFICORP - 20 11 INTEGRATED RESOURCE PLAN APPENDIX G - HEDGING STRTEGY
Figure G.4 - Reference Portolio versus Hedging Only Natural Gas
;:~:aII..o..i:
II Reference Portolio
II Hedge Only Natural Gas
($150)($100)($50) $0 $50
Potential Change in Value ($M)
$100 $150
In the "Reference Portfolio versus Hedgig Only Natual Gas", the portfolio where only natual
gas has been hedged (and electrcity positions left unedged) has a significantly wider
distribution of results than the reference portfolio. While both portfolios have an expected value
of zero over all potential scenarios, the alternate portfolio wil retu a significantly wider range
of outcomes. This is due to removing the natual offsetting featues of one commodity (i.e.,
hedging the short natual gas position) while leaving the long electricity position unedged.
168
PACIFICORP - 2011 IR APPENDIX G - HEDGING STRATEGY
Figure G.5 - Reference Portfolio versus Hedging Only Electricity
~~
:eni
"Qo..Q.
II Reference Portfolio
II Hedge Only Electricity
($150)($100)($50) $0 $50
Potential Change in Value ($M)
$100 $150
In the "Reference Portfolio versus Hedging Only Electrcity", the portfolio where only electrcity
has been hedged (and natual gas positions left unhedged) has a significantly wider distrbution
of results than the reference portfolio. While both portfolios have an expected value of zero over
all potential scenarios, the alternate portfolio wil retu a significantly wider range of outcomes.
This is due to removing the natual offsetting featues of one commodity (i.e., hedging the long
electrcity position) while leaving the short natual gas position unedged.
Hedging does not modify the expected outcome of net power costs associated with wholesale
market price and natual gas price changes. Consequently, the long-term gains and losses from
hedging are expected to net to zero. As shown in Figue G.1 above, the Company's hedging
costs are not material enough to warrant adjustment to resource costs or influence portfolio
selection.
IIi regard to assessment of hedging strategies, a hedging strategy should be tailored to fall within
a designated risk tolerance and conform to Company financial and administrative capabilities. A
rationale must be created taking into account risk tolerance for adverse impacts to net power
costs, and effects including market liquidity and hedge product availability, credit risk, and costs
such as collateral fuding for margining,
Finally, PacifiCorp shows that there is no objective measurement to indicate the optimum
amount of hedging, as demonstrated by a sensitivity analysis that compares a reference portfolio,
a less hedged portfolio, and a more hedged portfolio. Neverteless, the analysis shows that
169
P ACIFICORP - 201 1 INTGRATED RESOURCE PLAN APPENDIX G - HEDGING STRTEGY
hedging should tae full advantage of any natual offsets between long power and short natual
gas positions. Not taing advantage results in high risk (a wider distrbution of outcomes) as
indicated in the "hedge only power" and "hedge only natul gas" portfolios.
170
P ACIFICORP - 2011 IRP APPENDIX H- WESTERN RESOURCE ADEQUACY Ev ALUA nON
ApPENDIX H - WESTERN RESOURCE ADEQUACY
EVALUATION
The Utah Commission, in its 2008 IRP acknowledgment order, directed the Company to conduct
two analyses pertaining to the Company's abilty to support reliance on market purchases:
Additionally, we direct the Company to include an analysis of the adequacy of the
western power market to support the volumes of purchases on which the Company
expects to rely. We concur with the Offce fofConsumer Services), the WECC is a
reasonable source for this evaluation. We.direct the Company to identif whether
customers or shareholders wil be expected to bear the risks associated with its
reliance on the wholesale market. Finally, we direct the Company to discuss
methods to augment the Company's stochastic analysis of this issue in an IRP
public input meetingfor inclusion in the next IRP or IRP update.4
To fulfill the first requirement, PacifiCorp evaluated the Western Electrcity Coordinating
Council (WECC) Power Supply Assessment reports to glean trends and conclusions from the
supporting analysis. This evaluation, along with a discussion on risk allocation associated with
reliance on market purchases, is provided below. As part of this evaluation, the Company also
reviewed the status of resource adequacy assessments prepared for the Pacific Northwest by the
Pacific Northwest Resource Adequacy Forum.
Finally, this appendix describes a study that involved the development and stochastic simulation
of a market "stress" scenario. In developing this study, the Company received input from
participants at the June 29, 2010 Utah IRP stakeholder's meeting, and described its proposed
study approach at the October 5, 2010, IRP general public input meeting. This appendix
describes the study methodology and presents results of the stochastic simulations.
The Western Electrcity Coordinating Council (WECC) 2010 Power Supply Assessment (PSA)
shows WECC needing additional resources in 2019. Resource need is identified when load
(including a target reserve margin) exceeds available resources5. Since 2006, each subsequent
PSA study defers resource need to later years. This deferment is a fuction of net changes to:
load growth expectations, class I capacity entrants, scheduled retirements, resource performance,
transfer capabilities and modeling convention. 6
4 Public Service Commission of Utah, PacifiCorp 2008 Integrated Resource Plan, Report and Order, Docket No. 09-
2035-01, p. 30.5 Available resources = Existing Generation + Class I Addletire - Outage/Derate Adjustments + Net Irnports.
6 The 2010 PSA defines Class I capacity as being actively under constrction and online before Janua 1,2014.
The 2009 & 2008 PSA require Class I resources to be online by January 1,2013 and Januar 1,2012, respectively.
171
P ACIFICORP -2011 IR APPENDIX H- WESTERN RESOURCE ADEQUACY Ev ALUA TION
As seen in Figue 1, there were two significant capacity deferments: from 2012 (per 2008 PSA)
to 2016 (per 2009 PSA) followed by 2019 as seen in WECC's 2010 PSA. While the forecast
power supply margins (PSM) of the studies from 2006 though 2009 are comparable, the 2010
PSA employed a different, and superior, modeling convention. Namely, the 2010 PSA used
PROMOD IV, a chronological production cost model to assess WECC resource adequacy?
PROMOD iv, unlike WECC's previous model, uses coincident peak demand and employs a
more robust optimization of sub-regional transfers. It is noteworthy that even the 2009 PSA,
using the old modeling convention and non-coincident peak demands, did not forecast a capacity
need until 2016.
Figure H.t - WECC Forecasted Power Supply Margins
-5,000
30,000
25,000
20,000
15,000
10,000
!! 5,000
~"..
:Å¡ 0
-10,000
-15,000
-20,000
-25,000
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
~2006PSA ~2007PSA ..2008PSA ..2009PSA ~2010PSA
Note: WECC Power Supply Assessments includes Class 1 Planned Resourees Only
Of paricular interest is Basin, a sumer peakig sub-region comprised of Utah, Idaho, and
northern Nevada. A review of PSA studies from 2007 through 2010 reveals a similar pattern to
that ofWECC.8 The 2009 PSA identified a capacity need in 2013; the 2010 PSA defers the need
until 2018. As seen in Figure 2, the target reserve margin is maintained at the "zero" horizontal
axis.
7 PROMOD IV is electrcity market simulation softare licensed through Ventyx, an ABB Cornpany.
http://ww.venty.com/analytics/promod.asp8 Basin was not broken out as a sub-region in WECC's 2006 PSA.
172
PACIFiCORP-201l IRP ApPENDIX H -WESTERN RESOURCE ADEQUACY EVALUATION
The PSA' s target reserve margins, as developed by WECC, are not mandated. Instead, they serve
as a reasonable proxy for expected target reserve margìns in WECC's modelìng constrct.
Figure B.2 - Basin Forecasted Power Supply Margins
-1,000
1,500
1,000
500
2
~0....
~
-500
-1.500
-2,000
-2,500
-3,000
-3.500
2008 .2009 2010 20ll 2012 2013 2014 2015 2016 2017 2018 2019
~2007PSA -t2008PSA ~2009PSA ..2010PSA
-
Note: WECC Power Supply Assessments includes Class 1 Planned Resourees Only
The 2010 PSA, and prevìous PSA versìons, use a four-tìer buìldìng block approach to calculating
a sub-regìon's target reserve margìn. The first block, contìngency reserves, ìs set at 6% of a
balancìng authority's (BA) load. The second block, regulatìng reserves, ìs the amount of
spìnnìng reserves needed to ìnstantly match ìncreases ìn electrc load. Expected regulatìng
reserve levels were fuìshed by BAs to WECC ìn a 2010 data request. The thìrd block covers
addìtìonal forced outages beyond what ìs covered by operatìng reserves ìn the event of a second
contìngency event. The fourh block, temperatue adders, ìs the ìncremental amount of reserves
needed to cover a 1- ìn-l 0 temperatue event. For modelìng puroses, a BA' s load requìrement ìs
the sum of the BA's peak demand forecast plus the WECC's four-tìer target reserve margìn9.
As such, a sub-regìon's calculated target reserve margìn should cover a second contìngency
event ìn tandem wìth a l-ìn-l0 temperatue event. Moreover, wìth the addìtìon of Idaho Power's
9 A BA's peak demand forecast incorporates a l-in-2 chance of temperatue exceedace.
173
PACIFiCORP-201l IR APPENDIX H- WESTERN RESOURCE ADEQUACY Ev ALUA nON
Langley Gulch10 in 2012 and PacifiCorp's Lake Side 211 in 2014, additional capacity wil not be
needed until 2019 as shown in Figue H.3 (Note: Figue H.3 is a modified version of the Original
PSA char that includes the Langley Gulch and Lake Side 2 resources.)
Figure B.3 -Basin Forecasted Power Supply Margins with Selected Capacity Additions
-1,000
3,000
I2,000 Il
1,000
=
~..
~
o
-2,000
-3,000
-4.000
200S 2009 2010 2011 2012 2013 2014 2015 2016 2017 20lS 2019
..2007PSA _200SPSA ..2009PSA ..2010PSA ..201O+LangleyGulch .. 2010+Laugley Gulch+Lake Side II ~
Note: WECC Power Supply Assessment includes Class 1 Planned Resourees only. Langley Gulch, currently under
constrction, and Lake Side 2 as proposed by PacifCorp are included here to better reflect Basin's capacity status
in later years.
io Langley Gulch is a 280-MW sumer rated cornbined cycle under constrction in Idao. It was not included in the
2010 PSA as a Class I entrant since it was not under constrction at publishing time.11 PacifiCorp is seeking to acquire Lake Side 2, a 637-rnegawatt cornbined-cycle cornbustion tubine plant at the
Lake Side site in Utah.
174
P ACIFICORP - 2011 IR APPENDIX H- WESTERN RESOURCE ADEQUACY Ev ALVA nON
As seen in Figures 4 and 5, neither the Desert Southwest nor the Rockies subregions are
expected to need additional capacity prior to 2020.12
Figure H.4 - Desert Southwest Forecasted Power Supply Margins
Ii o
4,000
2,000
-2,000
-4,000
-6,000
-s,OOO
-10,000
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 201S 2019
~2007PSA ~200SPSA %W~2009PSA ..2010PSA ~Coolidge
Note: WECC Power Supply Assessments includes Class 1 Planned Resources Only. Coolidge Generating is
included.
12 Coolidge Generating is 512-MW gas tubine under constrction in Arzona. It was not included in the 2010 PSA
as a Class I entrant since it was not under construction at publishing time.
175
P ACIFICORP - 2011 IRP APPENDIX H- WESTERN RESOURCE ADEQUACY Ev ALUA nON
Figure D.5 - Rockies Forecasted Power Supply Margins
4,000
3,000
2.000
I ~ 1,000
! ~, .. 0! coIi
-1,000
-2.000
-3,000
-4,000
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
~2007PSA ..2008PSA ~2009PSA ~2010PSA
Note: WECC Power Supply Assessments includes Class 1 Planned Resourees Only.
Market depth refers to a market's ability to accept individual transactions without a perceptible
change in market price. While different from market liquidity13 the two are lined in that a deep
market tends to be a liquid market. Market depth in electrcity markets is a fuction of the
number of economic agents, market period, generating capacity, transmission capability,
transparency, and institutional and/or physical constraints. Based on the 2010 PSA, WECC
maintains a positive PSM through 2018. The Desert Southwest, Northwestl4, and Rockies
subregions are forecasted to maintain a positive PSM through 2019. Only Basin is forecast to
need capacity in 2018.15 In total, known market transactions, generation resources, load
requirements, and the optimization of transfers within WECC show adequate market depth to
maintain positive target reserve margins for several years.
13 Market liquidity refers to having ready and wiling buyers and sellers for large transactions.
14 The Nortwest is comprised of the Pacific Northwest and Montaa.
15 Langely Gulch and Lake Side 2, as discussed earlier, wil defer Basin's need until 2019.
176
PACIFiCORP-20ll IR APPENDIX H- WESTERN RESOURCE ADEQUACY EVALUA nON
The Pacific Northwest Resource Adequacy Foru issued resource adequacy standads in April
2008, which were subsequently adopted by the Nortwest Power and Conservation CounciL. The
standard calls for assessments three and five years out, conducted every year. The 2008 analysis
of 2011 through 2013, conducted before the economic downtu, indicated that "the region has
ample supplies over the next five years to avoid significant power curailments.,,16 A resource
adequacy report update for 2015 is under development. However, the resource adequacy
methodology is now undergoing review. The release of the 2015 report is now expected
sometime in 2011. Based on WECC's adequacy evaluation, the Pacific Northwest adequacy
situation is expected to remain adequate through 2015 and beyond.
Market Stress Test Design
PacifiCorp's underlying assumptions for the stress test are as follows:
. Based on the WECC resource adequacy assessment, the market reliance risk does not
become a factor until at least 2015. Consequently, the market stress period was defined as
2015 though 2020.
. Availabilty of front offce transactions for this period is reduced to 50% of levels
assumed for development of the test portfolio.
. Market prices experience a corresponding increase, reflecting reduced market liquidity;
the June 2008 Official Forward Price Cure was applied to simulate high market prices as
shown in Figue H.6
. To make up for the reduced front offce transaction availability, PacifiCorp assumed that
it would lease mobile simple-cycle combustion turbine units with a fixed cost of
$267/kW for a three-month period (July-September). The anual SCCT capacity
requirement ranges from 330 to 550 MW to cover the lost FOT capacity.
PacifiCorp selected a portfolio from the core case group, Case 14, as the test portfolio for the
analysis. Case 14 had the highest front office transaction reliance of the core case portfolios for
2015 - 2020. Table H.1 shows the replacement SCCT resource capacity added to the portfolio by
year to make up for the reduced FOT, as well as the annual dollars/kW fixed cost assumed for
leasing the peaking units.
The Company then simulated this portfolio with the Planing and Risk model, applying the
above set of market stress assumptions. Portfolio cost (stochastic mean PVRR and stochastic
upper-tail mean PVR) are compared against the original stochastic ru for Case 14.
16 The Pacific Nortwest Resource Adequacy Foru's Web page can be accessed with the following link:
htt://www.nwcounci1.org!energv/resourcelDefault.asp. The 2008 resource assessment paper is available for
download.
177
PACIFiCORP-2011 IR APPENDIX H- WESTERN RESOURCE ADEQUACY EVALUATION
Figure H.6 - Front Offce Transaction Market Price Comparison
Mid-Columbia Front Office Transaction Market Price
(3rd Quarter Heavy Load Hour)
140
120
100
.c~80:E-'I
ñic
.e 600z
40
20
0
-~--..-
I -
..
~~
2015 2016 2017 2018 2019 2020
.. Sept. 2010 FPC .. June 2008 FPC
Table H.t - Peaking Resource Megawatt Capacity Requirements and Fixed Costs
Mead Q3, Heavy Load Hour 50 50 0 0 0 0
Uta Q3, Heavy Load Hour 100 94 100 0 0 100
Mona, Q3, Heavy Load Hour 150 150 150 150 150 150
COB Q3, Heavy Load Hour 25 0 0 0 0 0
Mid-Coh.ia Q3, Heavy Load Hour 200 200 200 184 197 200
West Main Q3, Heavy Load Hour 25 25 25 0 0 25
Total 550 519 475 334 347 475
Anl Fixed Cost of Peaki Resources,$36,683,030 $31,706,2502010$
Stress Test Results
Table H.2 reports the PVRR line items details for the base stochastic simulation and the stress
test stochastic simulation. The stress test conditions resulted in a $387.3 milion increase in the
stochastic mean PVR.
178
PACIFICORP - 2011 IR APPENDIX H- WESTERN RESOURCE ADEQUACY EVALUATION
Table B.2 - Stochastic PVRR Details for Stress Test and Base Portfolio Simulations
Varble Costs
Fuel&O&M 8,461.6 9,312.7 851.
Emsion Cost 3,098.1 3,533.6 435.5
FOT's & Long Term Contcts 2,647.2 2,415.5 (231.7)
Demad Side Mangement $1,715 $1,715
Renewables $657 $671 13.35
System Balancin Sals (3,389.3)(4,273.9)(884.6)
System Balcin Pincbaes 1,710.3 1,805.5 95.2
Energy Not Served 70.9 71.0.1
Du Power (23.0)(24.0)(1.0)
Reserve Defiiency 0.0 0.0 (0.0)
Total Varble Costs 14,947.9 15,225.7 277.8
Capitl and Fixed Costs 2,973.2 3,082.6 109.4
TotalPVR 17,921.18,308.4
The higher costs for the stress test portfolio are drven by greater generation costs resulting from
increased thermal resource utilization to cover the replaced FOT, as well as the higher fixed costs
of the replacement peaking units. These costs were partially offset by increased market sales and
lower purchases stemming from use of the replacement peaking resources during peak periods.
Market purchase costs are reflected in rates. Consequently, customers bear the price risk of the
Company's reliance on a given level of market purchases. However, customers also bear the cost.
impact of the Company's decision to build or acquire resources if those resources exceed market
alternatives and result in an increase in rates. These offsetting risks stress the need for robust IRP
analysis, effcient RFPs and ability to captue opportistic procurement opportities when they
arise.
179
PACIFiCORP-20ll IRP APPENDIX I - WIN INTEGRATION STUY
ApPENDIX I - WIND INTEGRATION STUDY
This appendix provides the 2010 Wind Integration Study conducted durg the 2011 IRP
planing process. This is the version sent to paricipants on September 1,2010.
181
PACIFiCORP-20ll IR APPENDIX I - WIN INTGRATION STUDY
Pacì fi COrp
2010 Wind Integrtion Resource Study
September 1, 2010
182
PACIFiCORP-20ll IR APPENDIX I - WIN INTEGRATION STUY
1. Executive Summary
The purose of the 2010 Wind Integration Study (the "Study") is twofold. First, the Study
quantifies how wind generation affects the amount of operating reserve needed to maintain
historical levels of reliabilty. Second, the Study tabulates the cost of integrating wind
generation by measurng how system costs change with changes in operating reserve demand
and by measuring how system costs are affected by daily system balancing practices.
Based upon historical and simulated wind generation data and historical load data, the Study
shows that operating reserve demand for both regulation reserve service and load following
reserve service increases with higher wind penetration levels. For puroses of this Study,
regulation reserve service refers to operating reserves required by variability in both load and
wind over ten-minute time intervals and load following reserve service refers to operating
reserves required by both load and wind variabilty over hourly time intervals. Table 1
summarzes how operating reserve demand for both reguation and load following services
increases as wind penetration levels grow from approximately 425 MW to approximately 1,833
MW. Table 2 depicts the change in operating reserve demand that is incremental to a load only
calculation of the same tyes of reserve service.
Table 1. Annual average operating reserve demand by penetration scenario.
Load Only 425MW 1372MW 1833MW
Regulation Up 97 105 137 137
West Regulation Down 72 84 120 120
Load Following Up 101 114 139 141
Load Following Down 106 113 132 133
Regulation Up 138 140 201 231
Regulation Down 107 110 185 222EastLoad Following Up 139 144 207 245
Load Following Down 144 147 198 237
Table 2. Annual average operating reserve demand incremental to the load only scenario.
Load Only 425MW 1372MW 1833MW
Regulation Up 0 7 39 39
West Regulation Down 0 12 48 48
Load Following Up 0 13 38 39
Load Following Down 0 7 26 27
Regulation Up 0 3 63 93
East Regulation Down 0 3 78 116
Load Following Up 0 4 68 106
Load Following Down 0 3 54 93
183
PACIFiCORP-201l IRP APPENIX I - WIN INRATION STUY
The costs of integratig wind as calculated in this Study include costs associated with increased
operating reserve demand as outlined above and the costs from daily system balancing practices.
Both types of costs were calculated using the Planning and Risk model (paR), which is a
production cost simulation model configued with a detailed representation of PacifiCorp's
system. For each wind penetrtion scenario, a series of PaR simulations were completed to
isolate each wind integration cost component by using a "with and without" approach. For
instance, PaR was first used to calculate system costs without any incremental operating reserve
demand and then again with the added incremental reserve demand. The change in system costs
between the two PaR simulations drves the integration cost calculation. Table 3 summarizes the
wid integration costs established in this Study alongside those costs calculated as part of the
2008 Integrated Resource Plan.
Table 3. Wind integration costs per MW of wind generated as compared to those in the
2008 IR.
Study 200IRP 2010 Wind Integration Study 2010 Wind Integration Study
Wind Capacity Penetration 2,734MW 1,372MW 1,833MW
Te nor of Cost 2G-Year Levelized 3-Year Levelized 3-Year Levelized
Interhour / System Balancing ($/MWh)$2.45 $0.82 $0.86
Reserve ($/MWh)$7.51 $8.03 $8.85
Total Wind Integration ($/MWh)$9.96 $8.5 $9.70
As shown above, the Study finds that operating reserve demand and the associated costs increase
with wind capacity penetration. System balancing costs, drven by day-aheac forecast errors for
wind and load, trend similarly as wind penetration increases from 1,372 MW to 1,833 MW;
. however, as expected, system balancing integration costs are much lower than integration costs
for operating reserves.
184
PACIFiCORP-20ll IR APPENDIX I - WIN INTGRATION STUDY
2. Data Collection
2.1 Overview
The calculation of Operating Reserve demand was based on load and production data over the
2007 to 2009 period (the "Initial Term"). Figue 1 shows that over this period, ten-minute
interval data was not available for all wind resources included in the Study. Nonetheless,
PacifiCorp chose to use this data because it represented the best base of observed data available
within the company, it includes significant concurent load and wind generation data, and it
includes year-on-year variability in weather and other variables affecting load and wind
generation levels.
Figure 1. Raw historical wind production and load data inventory.
Plant name
Foote Crek
Stateline-
Combine Hils
Leaning Juniper
Woli.rine Creek
Marengo
Goodnoe Hils
Marengo II
Mountain Wind i
Size, MW
Timeline
Spanish Fork
-g Mountain Wind II
~Rollng Hills
Glenrock
94
70.2
60.9
19
79.8
99
99
39
99
20
99
28.5
99
111
Glenrock II
Sei.n Mile Hill
Sei.n Mile Hil II
High Plains
McFadden Ridge i
Three Buttes
Dunlap i
Rock Rii.r
.: =::= :;~:.;:.:::'I
* Capacity represents portion of the plant in PacifiCorp's control area.
The data inventory summarized in Figue 1 contains as much real, observed, concurent data as
possible, owing to the volatile and unpredictable natue of wind generation output as well as the
185
PACIFICORP - 2011 IRP APPENDIX I - WIN INTGRATION STUY
many fie variations available in real load data that can be difficult to captue with simulated
data. Nonetheless, the data set selected for the Study contains gaps, and as a result, PacifiCorp
utilized the services of the Brattle Group, the techncal advisor that assisted with this study, to
simulate missing wind data pertining to the Initial Term. The simulation of wind data is
discussed at lengt in its own section later in this report.
2.2 Historical Load and Load Forecast Data
The histoncalload data for the East and West Balancing Authonty Areas was collected for the
Initial Term from the PacifiCorp PI system17. These data were used for all the calculations
involving historical load in the Study. The hourly day-ahead load forecasts were gathered from
PacifiCorp's load forecast group, as were the day-ahead hourly load forecasts used to set up the
generation system through the Initial Term penod.
2.3 Historical Wind Generation and Wind Generation Forecast Data
2.3.1 Overview of the Wind Generation Data Used in the Analysis
Ten-minute interval metered wind generation data were available for a subset of the wind sites as
summanzed in Figure 1. The wind output data were collected by PacifiCorp at each physical
project location using the PI softare system. In addition to histoncal wid generation data, the
Study required historical day-ahead wind forecasts, modeled day-ahead wind forecasts for
simulated data, and the creation of an ideal wind profie. All of these data sets were needed to
establish wind integration costs using PaR and are discussed in tu below.
2.3.2 Historical Wind Generation Data
As shown in Figue 2, a cluster of PacifiCorp owned and contracted wind generation plants is
located in Pacific Power's service area (PacifiCorp's West Balancing Authonty Area) and
another is located in the Rocky Mountain Power service area (PacifiCorp's East Balancing
Authority Area). It is worth noting that two wind sites, Wolvenne Creek in Idaho, and Spanish
Fork in Utah are part of the East Balancing Authority Area, but are geographically distant from
both the western and the eastern clusters.
17 The PI system collects load and generation data and is supplied to PacifiCorp by OSISoft
http://W\.\fw.osisoft.com/software-supportwhat-is-pi/what is PI .aspx.
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PACIFiCORP-20lllR APPENDIX I - WIN INTEGRATION STUY
Figure 2. Map ofPacìfiCorp wind generating stations used in this study.
The available historical ten-minute wind generation data were examined to produce some initial
statistical diagnostics for each site and betweensItes. For each site, Table 4 shows: (l)number
of 10-minute interval data observations available, (2) stadard deviation of observed capacity
factors, (3) the minimum capacity factor, and (4) the maximum capacity factor. Small negative
capacity factor values (that show up as the minimum) in the data are the result of power
consumption associated with routine operation of the wind projects even durng times when the
project itself is not producing energy. Table 5 shows the correlation observed among aggregate
hourly load and wind generation data in 2008. By and large, hourly changes in load and wind
generation output, which drive operational planing, do not appear to be correlated.
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PACIFiCORP~2011 IRP APPENIX I - WIN INTGRATION STUY
Table 4. Statistical properties of wind site capacity factor data.
Plant Name Number of Observations Standard Deviation Min Max
Goodnoe 83,520 32%0%100!6
LeaningJuniper 157,824 35%0%100%
Combine Hills 157,824 38%-3%100%
Stateline 157,824 24%-1%100!6
Marengo 79,n6 33%-11%100!6
Wolverine Creek 157,824 29%-1%100%
Spanish Fork 74,736 29%-4%87%
Mountain Wind 66,æ6 29%0%100%
Foote Creek 157,824 30%-2%100!6
Seven Mile Hill 52,704 31%0%100!6
McFadden Ridge 11,952 34%-1%100%
High Plains 15,840 21%0%67%
Glenrock 50,256 29%0%100!6
Table 5. Hourly correlation of system wind and system load.
I Overall "Rolling 6 hour I Rolling 12 Hour
January -2.5%-2.9%l -3.4%
February -2.8%-0.6%1 -1.7%
March -0.4%-1.4%1 -2.2%
April -6.4%o ~-5.9%-3.5%~
May -10.4%I -6.4%-3.00A) I
~June -12.0%-9.2%1 -11.9%
July -12.4%-12.3%1 -14.2%
August -9.1%-8.4%~-9.8%
September -6.5%~-4.0%-0.6%1
October ~-6.7%-3.5%-4.8%1
~November -7.5%-3.6%1 -4.4%
¡¡December -2.0%0.3%1 -1.1%
2.3.3 Historical Day-ahead Wind Generation Forecasts
Day-ahead wind forecasts were collected from daily historical fies maintained by PacifiCorp
commercial operations. The fies contained day-ahead hour-by-hour wind generation forecasts
for the wind projects operating durg the Initial Term. For those projects not operating durg
the Initial Term, day-ahead forecasts were created using the daily volumetrc day-ahead forecast
error from projects having complete data sets. As such, these data were used to bootstrap18 the
daily day-ahead forecast volumetrc errors for the 1,372 MW and 1,833 MW scenarios, and the
daily error (positive or negative) was applied to simulated wind generation data to create a
18 Bootstrapping is a common statistical rnethod used to estimate data by extrapolatig frorn existing data.
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P ACIFICORP - 20 11 IRP APPENIX I - WIN INTGRATION STUY
modeled day-ahead forecast. The modeled day-ahead forecast maintained the same general
hourly shape as the simulated wind generation data but was shifted vertically hour-by-hour on an
equal percentage basis to keep the aggregate volumetric error constant.
2.3.4 Ideal Shape Wind Generation
In order to isolate wind integration costs from other system costs, a flat production profie is
required for PaR modeling. This profie, deemed the ideal wind shape for puroses of the Study,
treats all the energy produced by wind projects as monolithic blocks. Comporting with standad
trading products among forward energy markets in the Western Interconnect, the energy
produced in each l6-hour daily block between hour ending seven and hour ending 22 was treated
as a single block. Similarly, energy produced in the 8-hour block between hour ending 23 and
hour ending six was treated as a single block. For each block, the total energy delivered from
wind generation is averaged, thereby flattening the generation pattern.
2.4 Wind Generation Data Simulation
The technical advisor assisted PacifiCorp in developing the Study methodology and in
supplementing the historical wind generation data with simulated ten-minute interval wind
generation data. This section summarizes the methodology used to simulate wind generation
data and provides sample data and graphics to ilustrate the details involved in each step of the
process.
The overall approach to simulating wind generation data involved taing an historical data
inventory; addressing data quality issues in the data inventory; identifying gaps requirng
simulation; and finding the best suited relationship between pairs of sites; and using that
relationship to approximate the wind output for periods with missing historical observations.
However, it is worth noting that for sites with no historical data, the necessary numerical
relationships were estimated between relevant locations by using simulated wind data made
available by the National Renewable Energy Laboratory (NL). Additional detail on
simulation procedures is available in Appendix A.
2.4.1 Categorization of Historical Wind Data to Determine Simulation Scope
The historical wind data were classified into three groups to determine the periods requirig
simulation for each site. The three categories are defined in tu below, and Figue 3 depicts
how each site was categorized.
(1) Fully Available-this category refers to sites for which output data are available for the
entirety of the Initial Term. Specifically, these wind plants include: Leaning Juniper,
Combine Hils, Stateline, Wolverie Creek, and Foote Creek. These plants sum to 425
MW of capacity.
(2) Partially Missing-refers to sites for which output data are unavailable for a portion of
the Initial Term. The wind plants that fall into this category are: Goodnoe Hils, Seven
Mile Hil, Marengo, Spanish Fork, Mountain Wind, McFadden Ridge, High Plains, and
Glenrock. One importnt featue of the partally missing data profies is that the missing
portions are always chronologically located at the beginning of the time period--nce a
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PACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
partially missing data profile begins, it contains no fuher data "holes". These plants
sum to 848 MW of capacity.
(3) Completely Missing-refers to wid projects, for which no output data are available for
the 2007-2009 Initial Term. Those sites are: Dunlap I, Rock River, Rollng Hils, Three
Buttes, and Top of the World. These plants sum to 560 MW of capacity.
Figure 3. Categoriation of wid generation data.
ií avableata develop by Tecnica Advi
2.4.2 Simulation Process
The simulation process used in the Study evolved to become iterative in natue to ensure that
simulated wind generation data used to establish operating reserve demand was reasonably
aligned to the operating reserve demand calculated using observed wind generation data. As
such, different methods of error sampling and simulation techniques (multiple linear, Tobit; for
example) were evaluated in this manner. Tables 6 ilustrates an example of how operating
reserve demand calculated from observed and simulated data were used to evaluate different
error sampling and re-addition methods used in this iterative process for the West Balancing
Authority Area.
Table 6. Comparison of operating reserve demand calculated from actual wind generation
plant data and simulated wind generation plant data estimated using a least squares
regression and applying different scaling of errors added back into the raw prediction.
Actual Wind Generation Data
Load Following Up
15.0
Load Following Down
(19.1)
Regulation
15.5
Test (Developed Wind Data)
Error Scaling (%) Load Following Up10 9.950 10.675 11.7100 12.4
Load Following Down
(13.0)
(13.9)
(14.2)
(15.9)
Regulation
11.1
12.3
14.3
17.1
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PACIFiCORP-20ll IR ApPENDIX I - WIN INTEGRATION STUY
Several simulation attempts ended with values above the feasible generation capacity range, or
values beneath zero. Attempts to add the error term back into the prediction (a necessary
simulation step) also faced significant hurdles in developing reasonable results. The highly
variable ten-minute output led to error terms with ranges larger than the simulated values in
many cases, which would also test the boundaes of either zero or maximum plant capacity
delivered. Several processes were attempted to retu a sampled error estimation back to the
modeled estimate, per proper regression, including sampling of trcated error distrbutions,
medians of the error distributions, and various bins of errors sampled and added back to the
regression estimate. Varous combinations of these methods were put through the operating
reserve demand estimation calculations to assess whether the results were reasonable.
Ultimately, the Tobit simulation method (described in more detail in section A.4.3) and a 3-step
smoothed median of the sampled errors proved to offer reasonably stable results.
Ultimately, the iterative simulation process produced a simulation methodology comprised of
several sequential steps:
(1) estimate the Tobit regressions;
(2) using the regression coeffcients, generate estimates of the mean output of the
predicted variabl/9
(3) calculate the regression residuals;
(4) randomly sample the residuals accordig to predefied simulated output ranges;
(5) apply a non-linear 3-step median smoother to the sampled residuals;
(6) add the smoothed residual series to the predicted mean output.
A more detailed description of each step appears in Appendix A, and the resulting regression
coeffcients appear in Appendix B.
19 These are generally referred to in the literatue as "y hat"
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PACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
3. Methodology
3.1 Method Overview
This section of the Study presents the approach used to establish the enumeration of operating
reserve demand and the method for calculatig wid integration costs. Ten minute interval load
and wid data is used to estimate the amount of operating reserve, both up and down, needed to
manage fluctuations in load and fluctuations in wind within PacifiCorp's Balancing Authority
Areas. The operating reserve discussed here is limited to spinning reserve and non-spining
reserve, which are needed for regulation, load following, and contingency reserve services. For
puroses of this Study, regulation service refers to the operting reserve required to manage the
varabilty of load and wid generation in ten miute. periods, and load following service
represents the operating reserve required to manage the variabilty as measured in hourly
periods.2o Contingency reserve, although mentioned, is supplied in accordace with the North
American Reliability Corporation (NRC) standards and remains unchanged by the wind
generation contemplated in this Study. Therefore, the operating reserve quantities discussed
herein are only pertnent to supplying the demands of regulation and load following services,
which are assessed in for load, and load net wind scenarios.
Once the amount of operating reserve is established for different levels of wind penetration, the
cost of holding the reserve on PacifiCorp's system is calculated using PaR. In addition to using
PaR for evaluating operating reserve cost, the PaR model is used to estiate wind integration
cost associated with daily system balancing activities. These system balancing costs result from
the unpredictable natue of wind generation on a day-ahead basis and can be characterized as
system costs borne from committing generation resources against a forecast of load and wind
generation and then dispatching generation resources under actual load and wind conditions.
3.2 Incremental Operating Reserve Demand
A dense data set of ten-minute interval wind generation and system load drves the calculation of
the marginal reserve requirement in two components: (1) regulation, which is developed using
the ten-minute interval data, and (2) load following, which is calculated using the same data but
estimated using hourly variability. The approach for calculating incremental operating reserve
necessar to supply adequate capacity for regulation and load following at levels required to
maintain current control performance was based on merging curent operational practice with a
survey of papers on wind integration, as well as advisory from the technical advisor?! The
Initial Term load data is used as the baseline case (zero wind generation) in each scenaro.
Coincident wind data (as observed, plus that simulated by the technical advisor) were added in
increasing levels of wind capacity penetration to gauge. the change in operating reserve demand.
For puroses of the Study, the regulation calculation compares observed ten-minute interval load
20 PacifiCorp's definitions for regulation and load following are based on PacifiCorp's operational practice, and not
intended to describe the operational practices or termology used by other power suppliers or system operators.2! The external studies PacifiCorp has relied on can mostly be found on the Utility Wind Integration Group (UIG)
website at the following lin: htt://www.uwig.orgiopimpactsdocs.htrnl
192
PACIFiCORP-20ll IRP APPENIX I - WIN INTEGRATION STUDY
and wind generation production to a ten minute interval estimate, and load following compares
observed hourly averages to an average hourly forecast.
3.2.1 Regulation Operating Reserve Service Demand
With no sub-hourly clearg or imbalance market, PacifiCorp must plan to meet sub-hourly load
(and load net of wind) deviations with its own resources. This includes generating units on
automatic generation control (AGC), demand side management (DSM), and the ramping of
flexible generation units in real time operation, which requires that existing units be committed
and then dispatched to provide operating reserve. Wind variability among ten-minute intervals
can represent a quantity of generation required to ramp up or down to maintain system stability.
Regulation service demand for wind generation varability was considered first. To parse the
ten-minute interval wind variability from the ensuing load following analysis, a persistence
forecast of the rollng prior 60 minutes was used to analyze the variation of each ten minute
intervaL. The actual wind generation in each ten minute interval was subtracted from the rolling
average of the prior six ten-minute intervals, and the standard deviation was computed for each
monthly period. This approach follows the one used by the National Renewable Energy
Laboratory (NREL) for its recent "Eastern Wind Integration and Transmission Study".22
RegulationwindlOmin = Pcps2 (Windi)
Where:
PCPS2 = The percentile of a two-tailed distribution equaling the Balancing Authority Area's
CPS2 performance23
Windi == the wind forecast error defined as (WindActuallOmin -WindIO-min-forecast)
Wind1o-min-forecast = the rollng average of the wind generation in prior six ten-minute
intervals, also referred to as a persistence forecast of the rolling prior 60 minutes
WindActuallOmin = the observed wind generation for a given ten-minute interval
The load variability and uncertainty was analyzed comparng the ten-minute actual load values to
a line of intended schedule, which was represented by a line interpolated between an actual top-
of-the-hour load value and the next hour's load forecast target at the bottom of that (next) hour.
A sample of how the intended schedule compares to actual load data is shown in Figue 4. The
method approximately mimics real time operations process for each hour. At the top of the
given hour, the actual load is known and a forecast for the next hour was made. For the puroses
of this study, a line joining the two points was made to represent the ideal path for the ramp or
decline expected within the given hour. The resulting actual ten-minute load values were
compared to this straight line so as to produce a strip of error terms, as depicted in Figue 5 with
data from February 2009.
22 NREL, Eastern Wind Integration and Transmission Study, prepared by EnerNex Corporation, (Janua 10,2010),
p. 143. The report is available for download frorn the following hyperlin:
http://\\'\vw.nreL.goy/wind/systemsintegration/pdfs/20 IO/ewits final report.pdf23 The Control Performance 2 is a reliability standad is maintained by the Nort American Electrc Reliability
CounciL. A definition is available on page 30f the document at the following hyperlink:
http:/lwww.nerc.com/fies/Reliabilitv Standards Complete Set 201OJan25.pdf
193
PACIFiCORP..2011 IR APPENIX I - WIN INGRATION STUDY
The errors were assembled monthly and their Regulation demand estimated similarly to the
method used for the 10-minute values of the wind data:
RegulatioDloadlOmin = P cps2 (Load¡)
Where:
Load¡ = the load forecast error, calculated similarly to Wind¡
Figure 4. Sample of intended schedule ten-minute load estimate and observed system load.
7000
6000
II....II;:5500IItleu~
5000
6500
4500
-10 Minute Load Estimate
.. .. ..:'';';';Actuã f I.öãêf .. .
4000 tm ¡ II ¡, ¡ ¡¡ ¡, ¡ n i pj ¡ I ¡ ¡¡ I l ¡ ¡¡ ¡ i ¡ Ii 1!!I ¡ ¡! II ¡rTrrrrrl"~m¡ i, ,i ¡ II ¡ ¡ j II ¡ i i ii ¡ i, ,tT,rr
~ ~ ~ ~ ~ ø ~ ~ ~ ~ ~ ~ ~ w ~ w ~ ~ ~ ~ ~ ø ~ .~ ~ w ~ ~ ~ w~ ~ N N m m e e ~ ~ w w ~ ~ 00 00 ~ ~ 0 0 ~ ~ N N m M e e~ ~ M ~ ~ ~ ~ ~ ~ .~
Time
194
P ACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
Figure 5. Variabilty between the line of intended schedule and observed load with errors
highlighted by green arrows.
6000
.
~ 10 Minute Load Estimate ~
. Actual Load i
..
~..
I~
.II
~n
I ..~
"it ¡il,
6400
6300
6200
..
1i
! 6100
~
5900
5800
2:00 2:10 2:20 2:30 2:40 2:50 3:00 3:10 3:20 3:30 3:40 3:50 4:00
Time
As the ten-minute load and wind errors each represent unpredictable change in the need for
dispatchable generation, their variability was assessed separately and combined. The regulation
demand of load net wind generation was estimated assuming short term varations in load are not
correlated with changes in aggregate wind generation output though the use of a geometrc
average (shown for Regulation Up):
ReguiationUP10min = ReguiationLoadUP10min 2 + ReguiationWindUP10min 2
As the need for regulation service can vary whether the wind is up or down, both Regulation Up
and Regulation Down services were estimated at each end of the error distributions.
A sample of the errors logged for the same period, for load and wind, are shown in Figue 6. The
independence of the forecast errors for wind and load was assumed. These errors, or differences
between forecast and actual, comprised an estimate of the demand made on regulation service
operating reserves durig power system operations. These differences were calculated for every
ten minutes of operation through the Initial Term period, and separated into monthly bins for
fuer analysis.
195
P ACIFICORP - 2011 IR APPENDIX I - WIN INTGRATION STUY
Figure 6. Independent forecast errors in ten-minute interval load and wind generation
(December 2008, approximately 890 MW of wind penetration).
150.00
100.00
3:
:E 50.00.:0....u.
t;IIu 0.00GI..
i2
¡
I
-50.00 i
-100.00
Time
Analyzing the results on a monthly basis as opposed tò grouping all the calculations together
annually allowed for the fact that some months' power service actually required less regulation
(for example, July and August) than others, and so costs could be more accurately attbuted with
a weighted average of results as opposed to grouping the entire year's operations into a single
analysis bin. This is due to operating reserve being employed to manage the tails of the
distributions involved, and a single annual bin would apply the greatest tail occurences to the
entire year, as opposed to only the month in which it occurs. Figue 7 demonstrates the resulting
distributions of regulation demand for wind generation, where regulation down demand is the
negative side of the distribution. The vertical lines drawn on Figue 7 ilustrate the operating
reserve threshold defined in the Study and data labels are added to denote outlying data points.
Similarly, Figue 8 ilustrates the resulting distrbution of regulation demand for load, where
regulation up demand is the positive side of the distrbution.
196
PACIFiCORP-20ll IR APPENIX I - WIN INTEGRATION STUY
Figure 7. Wind Regulation errors plotted for the Mays of the Initial Term at the 1,372 MW
wind capacity penetration leveL.
6000
Operating Resere 5512Theshold
5000
4000
on..C....'ü.:Õ 3000
êi..
E:iz
2000
1000
1 2 3 1
o
448 426 384 342 299 257 215 173 131 100 68 26 -16 -58 -97 -122 -164 -206 -248 -290 -332 -374
Megawatts
Figure 8. Load Regulation errors plotted for the Mays of the Initial Term.
10000
9000
8000
7000
oi Operating Reserve..i:6000 .... . Thesld ai'i.¡:
.5-50000..ai,.
E 4000~z
3000
2000
,8800.,
i~'l'~',.
1000
2 1013 1 1 1 1 1
o
22612182202218631703 154 1385 1225 1066 907 747 588 429 269 133 30 -114 -2æ -368 -527 -687 -84
Megawatts
197
P ACIFICORP - 20 11 IR APPENIX I - WIN INTGRATION STUY
3.2.2 Load Following Operatig Reserve Demand
PacifiCorp maintains system balance by optiizing its operations to an hourly forecast with
. changes in generation and market activity. Ths planning interval represents hourly changes in
generation which are assessed within roughly 20 minutes each hour to account for a bottom-of-
the-hour (:30 after) scheduling deadline. Taking into account the conditions of the present and
the expected load and wind generation, PacifiCorp must schedule generation to meet demands
with an expectation of how much higher or lower system load (net of wind generation) may be.
PacifiCorp's real-time desk updates the next hour's system load forecast fort minutes prior to
each operating hour. This forecast is created by comparng the curent hour load to the load of a
similar-load-shaped day. The hour-to-hour change in load from the similar day and hours (the
load delta) was applied to the "curent" hour load and the sum is used as the forecast for the
ensuing hour. For example, on a given Monday the PacifiCorp operator may be forecasting hour
to hour changes in system load by referencing the hour to hour changes on the prior Monday, a
similar-load-shaped day. If the hour to hour load change between the prior Monday's like hours
was 5%, the operator wil use a 5% change in load as the next hour forecast.
As for the corresponding short term operational wind forecast, the hourly wind forecast is done
by persistence; applying the instantaneous sample of the wind generation output 20 minutes past
the curent hour to the next hour as a forecast and balancing the system to that point. The
resulting operational modeling process therefore went as follows; at the top of the hour, wind
generation output, dispatchable generation output, and load values were sumarized, and
trended using the methods above. The result was compared to the next hour's schedule for gaps
as soon as possible, with the generation and load values updated at roughly 20 minutes past the
hour. In real time operations, this result would then be balanced through a combination of
market transactions and scheduling adjustments to PacifiCorp resources to produce a balanced
schedule for the ensuing hour; with all transactions having to be complete by 30 minutes past the
hour. Meanwhile, for puroses of the calculation made in this Study, the hourly wind forecast
consisted of the 20th minute output from the prior hour, and the load forecast was modeled per
the approximation described above with a shaping factor calculated using the day from one week
prior, and applying a prior Sunday to shape any NERC holiday schedules.
Using the Initial Term data for PacifiCorp's Balancing Authority Areas, a comparson of the load
and wind forecasts was implemented to measure the seasonal or annual trends in the variabilty
between the hourly interval load and wind forecasts and the observed average hourly load and
wind generation values. These differences were segmented into bins by load magnitude and
wind generation magnitude using load and wind data, in order to facilitate making a weighted
average of the reserves demand by load level and wind generation output leveL. An example of
load and wind data segmented into bins appears in Figues 9 through 12. Figue 9 depicts
forecast load in West Balancing Authority Area with a range of over and under predictions tied
to Control Performance 2 (CPS2) performance leveL. Figue 10 shows the same data for the East
Balancing Authority Area. In similar fashion, Figue 11 displays forecasted wind generation in
the West Balancing Authority Area with a range of over and under predictions consistent with a
198
PACIFICORP - 2011 IRP APPENDIX I - WIN INTGRATION STUY
97% CPS2 performance leveL. Figue 12 shows the same wind generation forecast data for the
East Balancing Authority Area.
Figure 9. Example of bin analysis for load following reserve servce from load variabilty in
the West Balancing Authority Area (May 2007-2009).
4000
3500
2000
.............. ..u~òííër...
..Forecast Production
3000 ~Under
:i'l
le500:::
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Analysis Bin
I
i
1500
1000
Figuré 10. Example of bin analysis for load following reserve service from load variabilty
in the East Balancing Autbority Area (May 2007-2009).
7S00 ,
I
7000 1
6S00
6000
..Over
___ _,___, '"'__"_ ,_,."'''_,~f:Qrt£~S:tlD?-al!£t!Q.n'''_,. _
-w/1PUnder
,'500
iwl;ooo
4500
4000
3500
3000
9 10 11 12 13 14 15 16 17 18 19 20Analyis Bin
199
P ACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
Figure 11. Example of bin analysis for load following reserve servce from wind variabilty
at the 1,372 MW penetration level for the West Balancing Authority Area (May 2007-
2009).
600
100 --.----~-". '."'-'-'.'.'~-.'~--"_.--
'----.~Ünde¡.-~---------~--~ -~'_.,'
-I Forecast Producton
500
400 ~Over.....__~.____~ h__~_h._". . ......, _m.-._...._...._....__..._ ._._. m"", ..,,__. __.""...
300 .'"
l..
:E 200 --,-~--~._-
a 1234567 8 9WUU"M~~U~UW
-ioa Analysis Bin
Figure 12. Example of bin analysis for load following reserve servce from wind variabilty
at the 1,372 MW penetration level for the East Balancing Authority Area (May 2007-2009).
800
700
..Under
600
-I Forecast Production
='~Over500
on
¡¡
i&oo..
~
300
200
100
a
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Analysis Bin
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PACIFICORP - 2011 IRP APPENDIX I - WIN INTEGRATION STUY
Probabilities implied by the population of each bin, representing the expected amount of time
spent in each load state, were represented by the historical data. The percentile equivalent to the
historical CPS2 performance of PacifiCorp was sampled above and below the median of each of
the bins. The average CPS2 performance for PacifiCorp's East and West Balancing Authority
Areas over the period 2004 to 2009 was just below 97%. As the goal of this Study is to
incorporate wind integration in PacifiCorp's curent operations, the CPS2 performance of 97%
was emphasized in these calculations. An assessment of the overall system power quality is a
standalone topic that is beyond the scope of this Study, and thus, the Company assumed this
level of reliability wil be maintained. The difference between the CPS2 percentiles and the
median of the bins represents the implied incremental load following service for operating
reserve demand within that bin. As each respective bin also has an implied probability by the
number of data points fallng within it, the volumetrc position over the study period was
calculated as a simple weighted average.
To fuer explain the calculation method for load following reserve demand, the following
example follows from the ilustration in Figue 10. To assess the load following up reserve
position for Bin 5, subtract the lower bound value (5,532 MW from the system load forecast of
5,687 MW to arrve at an estimate of 154 MW for the occurences within that bin. Integrating
this process through all bins produced a composite load following up position for the East
Balancing Authority Area in May, and the process was repeated for each month in the up and
down directions. Wind generation was analyzed in exactly the same procedure, but with
generation output representing the individual state variable. The wind and load reserve positions
were combined using the root sum square calculation in each direction (up and down), assuming
their variability in the short term is independent.
ReservesLoadFollowing = LoadReserveSioadFoiiowíng 2 + WindReserveSioadFollowing 2
3.3 Determination of Wind Integration Cost
3.3.1 Overview
Owing to the varabilty and uncertainty of wind generation, each hour of power system
operations featues a need to set aside increased operating reserve (both spinning and non-
spinning reserve), in addition to those set aside explicitly to cover load and contingency events
which are inerent to the PacifiCorp system with or without wind. Additional costs are incured
with daily system balancing practice that is influenced by the unpredictable natue of wind
generation on a day-ahead basis. To derive how wind generation affects operating reserve costs
and system balancing costs, the Study utilizes the PaR modeL.
201
PACIFICORP - 2011 IR . APPENIX I - WIN INGRATION STUY
PacifiCorp's PaR model, developed and licensed by Venty Energy LLC, uses the PROSYM
chronological unit commitment and dispatch production cost simulation engine and is confgued
with a detailed representation of the PacifiCorp system. For this study, four different PaR
simulations were developed for a range of wind penetration scenarios as defined in Table 7. By
carefully designing the four simulations, we were able to isolate wind integration costs
associated with operating reserves and to separately calculate wind integration costs. associated
with system balancing practice. The former reflects integration cost that arises from short-term
(within the hour and hour ahead) varabilty in wid generation and the latter reflects integration
costs that arse from errors in forecasting load and wid generation on a day-ahead basis.
Table 7. Wind penetration scenarios used in PaR, as a percentage of total fleet capacity.
The four PaR simulations used for each penetration scenario in the Study are summarized in
Table 8. The first two simulations are used to tabulate operating reserve wind integration costs,
while the third and forth simulations support the calculation of system balancing wind
integration costs. Table 8 identifies how key input variables change among the simulations. The
simulations were ru over the 2011 to 2013 forward term (thee years), wherein 2007 wind
generation and load data are used as inputs for 2011, 2008 wind generation and load data are
used for 2012, and 2009 wid generation and load data ar used for 2013. This calculation
method combînes the benefits of using actual system data available for the historic three-year
Initial Term period with curent forward price curves pertent to setting the cost for wind
integration service on a forward basis.24 PacifiCorp resources used in the simulations are based
upon the 2008 IR Update resource portfolio.25
24 The Study uses the March 31, 2010 offcial forward price cure.
25 The 2008 Integrted Resource Update report, fied with the state utilty commssions on March 31, 2010. The
report is available for downoad frorn PacifiCorp's IR Web page using the following hyperlin:
htt://WV.W.pacificorp.com/content/dam/pacificoæ/doc/Energy Sources/Integrated Resource Plan/2008IRPU pdate!
PacifiCorp-2008IRPUpdate 3-31-10.pdf
202
PACIFiCORP-20ll IR APPENDIX I - WIN INTEGRATION STUY
Table 8. Wind integration cost simulations in PaR.
1 2011 - 2013 Actual Ideal Shape None None
2 2011 - 2013 Actual Actual Yes None
Operating Resere Integrtion Cost = System Cost from PaR simulation 2 less system costs from PaR simulation 1
3 2011 - 2013 Day-ahead Day-ahead Forecast Yes NoneForecast
Yes
4 2011 - 2013 Actual Actual Yes (Commtment frorn
PaR Simulation 3
System Balancing Integrtion Cost = System Cost from PaR simulation 4 less system costs from PaR simulation 2
3.3.2 Calculating Operating Reserve Wind Integration Costs
To assess the effects of various levels of wind capacity added to the Balancing Authority Areas
on operating reserve costs, each penetration scenario was simulated in PaR using both ideal
(Simulation l) and actual (Simulation 2) wind profies. Both the ideal and actul PaR
simulations excluded System Balancing costs. The ideal wind profie is a "flattened"
representation of the actual profile, where wind generation is averaged across on- and off-peak
blocks. Such a profile requires no additional operating reserve to support wind generation
variability, and as such, Simulation 1 only included an operating reserve needed for load
variability. In summary, Simulation 1 included actul historical loads, ideal wind profies, and no
incremental operating reserve to account for wind varability.
Simulation 2 used the actual wind generation profiles, which reflect the 2007 to 2009 observed
and developed Initial Term wind data as inputs for the 2011 to 2013 forward period. These
actual wind generation profiles reflect the same variability used to derive the incremental
operating reserve requirements needed to integrate wind generation. Thus, the second PaR
simulation includes the incremental operating reserve demand created by the variable natue of
wind generation as well as the actual, varable wind generation profies.
The system cost differences between these two simulations were divided by the total volume of
wind generation in each penetration scenario to derive the wind integration costs associated with
having to hold incremental operating reserve on a per unit of wind production basis.
3.3.3 Calculating System Balancing Wind Integration Costs
PacifiCorp conducted another series of PaR simulations to estimate daily system balancing wind
integration costs consistent with the wind penetration scenarios studied. In this phase of the
analysis, PacifiCorp generation assets were committed consistent with a day-ahead forecast of
203
PACIFiCORP-20ll IR APPENDIX I - WIN INTGRATION STUY
wind and load, but dispatched against actual wid and load. To simulate this operational
behavior, two additional PaR simulations were necessar for each wid penetration scenario.
Simulation 3 was used to determine the unit commitment state of generation assets given the
day-ahead forecast of wid generation and load. Simulation 4 used the unit commitment state
from Simulation 3, but dispatches units based on actual wind generation and load. This actual
wind and load data is pulled from the Initial Ter , and thus, is identical to the actual wind
generation and load inputs used to derive operatig reserve wind integration costs as described
above. In both of these PaR simulations, the amount of incremental reserve required for each
penetration scenaro was applied.
The change in system costs between Simulation 4 and the system costs from Simulation 2
already produced in the estimation of operating reserve integration costs isolates the wind
integration cost due to system balancing. Dividing the change in system. costs by the volume of
wind generation in each penetration scenario produced a system balancing integration costs on a
per-unit of wind production basis.
3.3.4 Allocation of Operating Reserve Demand in PaR
PaR Simulations 2 through 4 require operating reserve demand inputs that must be applied
consistent with the ancilary services strctue native to the modeL. The PaR model distinguishes
reserve types by the priority order for unit commitment scheduling, and optimizes them to
minimize cost in response to demand changes and the quatity of reserve required on an hour-to-
hour basis. The highest-priority reserve tyes are regulation up and re¡ilation down followed in
order by spinning, non-spining, and fially, 30-minute non-spining. 6 Reserve requirements in
the model need to be allocated into these PaR reserve categories and are expressed as a
percentage of load.
The regulation up and regulation down reserves in PaR are a tye of spinning reserve that must
be met before traditional spinning and non-spining reserve demands are satisfied. The
incremental operating reserve demand needed to integrate wind generation was assigned in PaR
as regulation up and regulation down. The traditional spining and non-spinning reserve inputs
are used for contingency reserve requirements, which remain unchanged among all PaR
simulations in the Study. The 30-minute non-spinning reserve is not applicable to PacifiCorp's
system, and thus it is not used in this Study.
26 In PaR, spinning reserve is defined as unoaded generation which is synchronized, ready to serve additional
dernand and able to reach reserve amount within 10 miutes. Non-spining Resere is defined as unloaded
generation which is non-synchronized and able to reach required generation amount within 10 minutes.
204
PACIFiCORP-2011 IR APPENDIX I - WIN INTEGRATION STUY
Note that given the hourly granularity in PaR, there is no distinction between operating reserve
categorized as regulation and load-following in terms of how the model optimizes their use.
Thus both regulation reserve service demand and load following reserve servce demand are
combined as a geometrc average and input in PaR as regulation up and regulation down.
Furher, owing to the hourly granularty of PaR and the fact that PaR optimizes dispatch for each
distinct hour, regulation reserves are effectively released for economic dispatch from one hour to
the next. The PaR model requires separate inputs for spining operating reserve and non-
spinning operating reserve. Table 9 summarizes how the services for operating reserves are
applied in PaR.
Table 9. Allocation of operating reserve demand to regulation, spinning and non-spinning
reserve categories in PaR. 27
Reserve Service PaR Regulation Up PaR Regulation Down PaR Spinning Reserves PaR Non-5pin Reserves
RegulationUP10..n RegulationUp, O"n 0 0 0
RegulationDown,o..n 0 RegulationDown,oMin 0 0
Load Following Up Load Following Up 0 0 0
Load Following Don 0 Load Following Down 0 0
0.5*(5% of Hydro and Wind 0.5*(5% of Hydro and Wind
Contingency 0 0 Generation output + 7% of Generation output + 7% of
Thennal generation output)Thennal generation output)
Tolal Geometric A\Ærage of the abo\Æ Gemetric A\Ærage of the abo\Æ Sum of the abo\Æ Sum of the abo\Æ
3.3.5 Satisfying Reserve Service Demand in PaR
PacifiCorp's thermal and hydro units are able to meet the reserve demand entered in PaR as
shown in Table 10. Regulation reserve is tyically held by units operating in automatic
generation control (AGe) mode.
27 Contingency Reserve is specified by the Nort American Energy Corporation in per
http://w"\vw.nerc.com/fiesíBAL-S TD-002-0 .pdf .
205
PACIFiCORP-20ll IR APPENIX I - WIN INTGRATION STUY
Table 10. Reserve servce capabilty of each generating unit in PaR.
I Unit Name I Regulaton Up IRegulatiOn D~ Non-SpinBEAR RI No No No Yes.CARBN I No No Yes v_-CARBN 2 No No Yes Yes.CHliS Yes YesæOLL 4 I Yes I Yes Yes "CLRWATER I & 2 No No No YesCOLSTRI 3 & 4 No No No '"COPCO I & 2 No No Yes .. iesCRIG I & 2 No No No YesCUNT CR I I'" I . res YesDAVE JOHNSTON I No No . Yes .
DAVE JOHNSTON 2 No No -t Yes..
DAVE JOHNSTON 3 No No .
DA VEJOHNSTON 4 i YèS Yes YesFISH CR No No NoGADSBY I No No I Yes
GADSBY 2 No No Yes
GADSBY 3 i i= -_.
GADSBY 4 I . · Yes .- YesGADSBY 5 I. Yes Yes YesGADSBY 6 . . I"S YesHAYDEN I & 2 No No NoHEISTON I I . v__ I Yes
HEISTON 2 I Yes. I Yes I YesHUER I " Yes I _HU 2 I Yes Yes IHUER 3 I. Yes YesHUINGTON I Yes Yes .
HUINGTON 2 ì'''b I Yes -JC BOYL No No
JI BRI I i.. Yes . Yes -
JI BRI 2 ... Yes Yes
JIM BRIGE 3 res Yes - ~ Y""JIM BRI 4 Yes Yes i
IAKE SIDE .. . Yes Yes. Yes .IEOW No NoUTTLMOUNAIN No NoMERWIN No No
MID-CLUMBIA .: Yes !.
NA UGHON I No
NA UGHON 2 Yes
NAUGHON 3 I YesSWIF Yes
TOKESLIE NoWYODAK I . Yes . .YALE I. Yes /.
Yes
: .., .'1'"
.
-~:~ -
Yes ..Yes +
Yes . ,..
Yes:.No
--
No
No
No
No I Yès
Yes I Yes
- Yes
I v...No No.,,,_ I .
.. . --
"--
.
Yes
Yes .1
206
PACIFCORP-20ll IR APPENDIX I - WIN INTEGRATION STUY
3.3.6 Modeling gas plant utiization in PaR
One of the objectives in calculating wind integration costs using PaR was to emulate observed
real-time unit commitment and dispatch behavior of PacifiCorp's thermal plants durng the
simulation period. A specific focus was placed on east-side gas plants capable of providing
regulation reserve service. The commitment status of these gas plants, consisting of Curant
Creek, Lake Side, and Gadsby units 4 through 6, was initially set to "must ru" in PaR to mirror
recent utilization of these units. In the PaR framework, must ru status means that the unit is
committed, but not ne.cessarily fully dispatched, at all times. PacifiCorp then compared the
resulting simulated capacity factors for the simulation year 2013 against actual plant capacity
factors for 2009 keeping in mind that 2009 wind generation and load data are used as inputs for
the 2013 PaR simulation year. Differences in the capacity factors were reasonably small.
Given these findigs, PacifiCorp concluded that PaR was reasonably aligned with actual
operational characteristics of the east-side gas plants when setting Curent Creek and Gadsby
units 4 through 6 as must run. Consequently, this must ru configuration was applied in PaR to
circumvent the fact that PaR establishes unit commitment on price and not necessarily on
operating reserve requirements. In this way, and consistent with recent operational practice, the
Curent Creek and Gadsby units 4 through 6 are available for meetig operating reserve
obligations even when out-of-the-money from a pure market dispatch perspective.
The must ru setting on Curant Creek and Gadsby units 4 through six was applied in PaR
Simulations 2 through 4. In each of these simulations, incremental operating reserve demand
needed to integrate wind is applied in the model, and must..run configuation ensures that the
select set of east-side gas units wil be available to meet the added reserve obligation even at
times when they are out-of-the-money. In contrast, PaR Simulation 1 does not include any
incremental operating reserve demand, and thus, the must-ru setting was not used.
3.3.7 Transmission Topology in PaR
PacifiCorp used the PaR transmission topology consistent with the 2008 IRP Update as shown in
Figure 13.
207
PACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
Figure 13. PaR transmission topology.
.
iw Load
.. Generation
~ PurchaselSale Mark
ø= Co n tract/Exhanges
.. PaCifiCorpTransn'sson-Owned/FirmR¡~Is"'
.... Planned EnergyGatewyTransmissin "
3.3.8 Carbon Dioxide Cost Assumptions in PaR
Given the 2011 to 2013 forward term used in the Study, there was no C02 cost applied to fossil-
fired thermal generating resources. This assumption simplifies any comparson of the calculated
wind integration cost among the thee forward simulation years and avoids the possibilty of
disparity between plant dispatch costs and wholesale electrcity market forward prices used over
the term. This is in contrast to the 2008 IRP Update, in which PacifiCorp assumed that federal
cap and trade carbon dioxide (C02) allowance prices go into effect in 2013, with prices staing
at $8.58/ton in 2013 dollars and escalating at 1.8 percent per year thereafter.
208
PACIFiCORP-20ll IRP APPENDIX I - WIN INTGRATION STUY
4. Results
4.1 Operating Reserve Demand
Based upon historical and simulated wind generation data and historical load data, the Study
shows that operating reserve demand for both regulation reserve service and load following
reserve service increases with higher wind penetration levels. Table 11 sumarzes how
operating reserve demand for both regulation and load following services increases as wind
penetration levels grow from approximately 425 MW to approximately 1,833 MW.
Table 11. Annual average operating reserve demand by penetration scenario.
Load Only 425MW 1372MW 1833MW
Regulation Up 97 105 137 137
West Regulation Down 72 84 120 120
Load Following Up 101 114 139 141
Load Following Down 106 113 132 133
Regulation Up 138 140 201 231
..
Regulation Down 107 110 185 222EastLoad Following Up
.
139 144 207 245
Load FollowingDown 144 147 198 237
The increase in operating reserve necessar to support wind generation in grd operations is
apparent in each of the penetration scenarios. For example, very little wind generation is added
to the East Balancing Authority Area between the load-only and 425 MW scenaros, and
understandably, there is little increase in the resultant incremental operating reserve demand.
The same situation occurs between the 1,372 MW and 1,833 MW penetration scenaros on the
West Balancing Authority Area, where again, there is little change to the calculated operating
reserve demand. Additionally, as significant wind generation development impacts the East
Balancing Authority Area between the 425 MW and 1,372 MW scenarios, and again between the
1,372 MW and 1,833 MW scenarios, there is clearly a proportionate growth of the operating
reserve required to satisfy higher levels of wind penetration.
Tabular monthly results for each Balancing Authority Area and for each tye of reserve service
appear in Appendix C. For convenience, Figues 14 through 21 summarize monthly operating
reserve demand results. In reviewing these figues, it is helpful to compare the growth of
estimated reserve demand per MW of wind penetration recognizing that most of the wind
capacity in the 425 MW penetration scenario is in the West Balancing Authority Area and that
most of the incremental wind capacity in the 1,372 and 1,833 MW penetration scenarios is in the
East Balancing Authority Area.
209
PACIFiCORP-20ll IR APPENDIX I - WIN INGRATION STUY
Figure 14. Load following up operating reserve servce demand in the West Balancing
Authority Area.
r
200
180
160
140
120
:: 100:E 80
60
40
20
West Load Following Up
1 2 3 4 5 6 7 8 9 10 11 12
Month
-Load
-425MW
-1372MW
-1833MW
'\
I
Figure 15. Load following down operating reserve service demand in the West Balancing
Authority Area.
r 200
180
160
140
120
~ 100
80
60
40
20
i
I
l,-
West Load Following Down
1 2 3 4 5 6 7 8 9 10 11 12
Month
-Load
-425MW
ØfE-1372MW
-1833MW
L
i
i
i
I
I)
210
PACIFiCORP-20ll IRP APPENDIX I - WIN INTEGRATION STUY
up operating reserve servce demand in the West BalancingFigure 16. Regulation
Authority Area.
r
:: 120~
\,."
West Regu lation Up
180 L
i
I
I
-1372MW I
I
-Load
-425MW
-1833MW
I
J
160
140
100
80
60
. 1 6 10 11 127892345
Month
down operating reserve service demand in the West BalancingFigure 17. Regulation
Authority Area.
r
::~
West Regulation Down
160
140
120
100
80
60
40
20
-.'\
I
i
!
-Load
-425MW
""~1372MW
-1833MW
1 2 3 4 5 6 7 8 9 10 11 12
Month
211
PACIFiCORP-20ll IR APPENIX I - WIN INTGRATION STUY
Figure 18. Load following up operating reserve service demand in the East Balancing
Authority Area.
I
East Load Following Up
350
-~-./..-..~~
-.- ~--~
l
¡
-Load
-425MW
"-~1372MW
I-1833MW I
I
)
1 2 3 4 5 6 7 8 9 10 11 12
Month
Figure 19. Load following down operatig reserve servce demand in the East Balancing
Authority Area.
f
250
200
3=~150
100
I
50
I
1 2 3 4 5 6 7
Month
L
East Load Following Down
350 l
-Load
-425MW
12
I
I-1372MW r
i
I
j
300
8 9 10 11
--1833MW
212
PACIFICORP - 2011 IRP APPENDIX I - WIN INTEGRATION STUY
up operating reserve service demand in the East Balancing
East Regulation Up
350
ì
250
i200
3=-Load
I~150
I
-425MW
100 -1372MW
50 -1833MW
1 2 3 4 5 6 --8 9 10 11 12
Month
Figure 20. Regulation
Authority Area.
r
I"
300
down operating reserve service demand in the East Balancing
East Regulation Down
300
12
L
I
I
-1372MW I
i
J
Figure 21. Regulation
Authority Area.
r
Ii
200
I ~ 150
250
100
50
1 2 6 8 9 11
""Load
-425MW
-1833MW
10357
Figues 14 through 21 identify both the seasonal natue of the operating reserve required to cover
wind integratìon services and the tendency for the services' demand to be increased in months
where more wind energy is generated. The monthly variation in operating reserve demand is
built into the costing of the services in PaR, considering that the allocation of operating reserve
for wind generatìon is less in the months where there is less need.
4
Month
213
PACIFiCORP-20ll IRP APPENIX I - WIN INTGRATION STUY
4.2 Wind Integration Costs
Tables 12 and 13 present the wind integration cost results for each wind penetration scenario.
Costs are reported in both present value revenue requirement (PVR) dollars and dollars per
megawatt-hour of wind generation for each year in the study period. Levelized costs across the
three year study term are also included in the far right colum of each scenario table.
Table 12. PaR simulation results for the load only scenario and the 425 MW wind
penetration scenario.
Wi;;
I LeyellzedTotl vañable costs 2011 202 203
Base (No Wind)
Simulation 1 $1,192,79 $1,311,178 $1,305n
Simulation 2 N/A N/A N/A
Simulation 3 1.188,90 $1,300,920 1,28,758
Simulation 4 1,201,530 1,322.3n 1,313,055
calculation of Integration Costs
Operating Reserve
L(Sim 2 less Sim 1)thousands $
System Balancing
(Sim4IessSim2¡$$
Total thousands $$$ .
Wind Generaion (Acual)
East Wind GWh bWest Wind
Total GWh
Operaing Reserve $/MWh $$$b5ystem Balancing $$$Total Wind Intgraon $/MWh $$$$ .
425MW
I Leyellzed201120122013
1,141,308 1,251,695 1,249,391
1.150,552 1.261.783 1,259,733
$1,145,876 1,251.190 1,241,73
1,152,34 1,264,907 l,264,2n
9,244 W,088 10,342 $25,830
$1,79 3,124 4,54 $8,09
$11,04 13,212 14,886 $ 33,924
534 603 520 1,446
754 794 66S 1,937
1,28 1,396 1,18 3,383
$7.8 $7.22 $&73 $7.64
$1.39 $2.24 $3.83 $2.39
$8.57 $9.46 $1256 $10.03
214
P ACIFICORP - 2011 IRP APPENDIX I - WIN INTGRATION STUY
Table 13. PaR simulation results for the 1,372 MW and 1,833 MW wind penetration
scenarios.
Total variable co
1400MW
2011 2012 2013 I Levellzed
17S0MW
2011 2012 2013 i Levelized
Base (No Wind)
Operatng Reseive
System Balancing
Total Wind Integration
thousands
$1,04,895 $1,141,572 $1,148,139 $1,014,831 $1,103,397 $1,112,343
1,075.215 1,172,782 $1,180,728 $1,053,713 $1.145,954 $1,15,n4
1,08,733 1,179,114 $1,176,68 $1,06,86 $1,163,768 $1,163,482
$1.on,117 $1,175,126 $1,18,073 $1,057,08 $1,149,48 $1,162,164
thousands $28,320 $31,210 $32,58 $80,135 38,88 $42,557 $44,431 $109,512
$1,902 2,34 5345 $8,165 3,374 3,530 5,390 $10,60
thousands $30,222 33,554 37,934 $88.30 42,25 46,087 49,821 $120,121
GWh 2,319 2,520 2.232 6,175 3,230 3,483 3,106 8,576
1,462 1,556 1,332 3,805 1,46 1,556 1,332 380
GWh 3,781 4,076 3.564 9,980 4,692 5,04 4,438 12,38
$!MWh $7.49 7.66 $9.14 8.03 $8.29 8.44 $10.01 8.85
$0.5 0.58 $1.50 0.82 $0.72 0.70 $1.21 0.86
$/MWh $7.99 8.23 $1064 8.85 $9.01 9.14 $11.23 9.70
Simulation 1
Simulation 2
Simulation 3
Simulation 4
Calculation of Integraton Coss
Operating Reserve
(5im 2 less 5im 1)
System Balancing
ISim 4 less Sim 2)
Total
Wind Generaon (Actual)
East Wind
West Wind
Total
The PaR model results demonstrate interesting trends in the component costs. Most notable is
the reduction of system balancing costs for the 1,372 MW and 1,833 MW wind capacity
penetration scenarios when compared to the 425 MW wind capacity penetration scenario. This
is due to the domination of load forecast error in the 425 MW scenario system balancing
integration cost line item, where total system costs are divided by wind energy production to
derive system costs on a per unit of wind generation basis. The system balancing costs stabilize
as wind generation increases in the higher penetration scenaros. Additionally, the operating
reserve integration costs increase with additional wind capacity penetration. The rate of increase
in costs is outpacing the increased wind energy produced, resulting in a higher price per
megawatt-hour of wind energy produced. Finally, it is noteworthy that the addition of wind
generation capacity lowers overall system costs.
Table 14 compares the results of the Study to integration costs developed for the 2008 IRP on a
component by component basis using Levelized costs over the applicable terms. The primar
differences in results are most apparent for inter-hour (2008 IRP)/system balancing (2010 Study)
wid integration costs. This difference is explained by improvements in method. In the 2008
IR, market transaction costs were used to estimate inter-hour integration costs, whereas the
curent Study calculates system. balancing integration costs derived from the operation of
PacifiCorp resources.
215
PACIFICORP - 2011 IR APPENIX I - WIN INTGRATION STUY
Table 14. Wind integration cost comparison to the 2008 IRP.
Study
Wind Capacity Penetration
Tenor of Cost
20081RP
2734MW
:zYear leve ii zed
2010 Wind Integration Study
1372MW
3-Year levelized
2010 Wind Integration Study
1833MW
3-Year levelized
Expected to Day Ahead ($/MWh)
Day Ahead to Hour Ahead ($/MWh)
System Balancing ($/MWh)
Subtotallnterhour / System Balancing
$0.28
$2.17
$2.45
$0.82
$0.82
$0.86
$0.86
Intra Hour Reserves1 ($/MWh)
2010 Study Operating Reserves ($/MWh)
$7.51
$8.03 $8.85
Total Wind Integration $9.96 $8.5 $9.70
Assumptions
Forward Price Curve Oct 2008, $8C02 Mar 2010, No C02 Mar 2010, NoC02
1- IRP resources were available to meet Operating Reserve demand before the in-service year, which lowers wind integration cost
4.3 Application of Wind Integration Costs in the 2011 Integrated Resource Plan
The start of portfolio development for PacifiCorp's 2011 IRP is scheduled for September 2010.
Portfolio development relies on the Company's capacity expansion optimization model, called
System Optimizer. (Note that wind integration impacts are treated as an increased resource cost
in the System Optimizer modeL.) The high-end wind capacity penetration scenario wil not be
completed until after portfolio development is well underway. Until costs are assessed for the
high-end wind capacity penetration scenaro, PacifiCorp wil use the costs developed for the
1,833 MW penetrations scenario, totaling $9.70/M of wind generated power.
216
P ACIFICORP - 2011 IR APPENDIX I - WIN INTEGRATION STUY
Simulation of Wind Generation Data
A.I Detailed Discussion of Statistical Patterns of the Historical Wind Output Data
From the available ten-minute interval historical wind generation data over the 2007 to 2009
Initial Term, there are four key observations. First, wid output has a seasonal pattern. Taking
one plant as an example, Figue 1A shows capacity factor data for Leaning Juniper in 2009. The
red markers in the figue indicate the median of the distrbution, and the wide bar delineates the
25th to 75th percentiles of the distrbution. Figue 1A shows the median, as well as the range of
observed capacity factors in each month in 2009 for Leaning Juniper varies significantly.
Second, . the monthly standard deviations for capacity factor output are very different across sites
in most months. Figue 2A compares the output patterns across June, July, and August of 2009
for Leaning Junper ~ and Combine Hils and shows that non-normality is evident in. the data.
Again, the red markers indicate the median of the distrbution, and the wide bar represents the
25th to 75th percentiles in the distrbution. Third, the commonly-accepted notion that wind output
follows a pronounced diural pattern is only partially supported by the various historical profies
in the dataset, as apparent in Figue 3A. In general, such recurng patterns are more easily
found in average aggregate representations of the data on hourly level, rather than by examining
higher resolution ten-minute data.
Figure IA. Leaning Juniper 2009 monthly capacity factors.
217
PACIFiCORP-20ll IR APPENDIX I - WIN INTRATION STUY
Figure 2A. Comparison of Leaning Juniper and Combine Hils capacity factors.
onthly Capacit Factor Output Rang
Combine Hils and Leaning Juniper (2009)
Figure 3A. Daily generation patterns of several PacifCorp wind plants.
100%....---- leaun . ,,,. mago
".. -- wolver -Monthly Avere
90%
80%
70%..
~ 60%
'"~50%.0=
ê' 40%U
30%
20%
10%
0%
Actal Capacity Factrs....... glon ....... go
.....'Jshfo ......._
g¿,
g
~
ÒÌ
Finally, Figues 4A and SA present the empircal distrbution of the 2009 capacity factor output
of Leaning Juniper and Combine Hils, respectively. Both plants' hourly capacity factor data
represent two key patterns to the study. One, that there are a very substantial number of zero
generation hours for each station. Two, the output varies greatly though the potential capacity
range of each generating station, implying the wid generation wil have the characteristic to
vary from one time period to the next. This is different behavior than would be implied by a
218
PACIFiCORP-2011 IRP APPENDIX I - WIN INTEGRA nON STUDY
strong bimodal diural pattern, which would imply very regular on/off behavior with and without
wind.
Figure 4A. Distribution of observed 2009 hourly capacity factors at Leaning Juniper.
Figure SA. Distribution of observed 2009 hourly capacity factors at Combine Hils.
A.2 Time Pattern of the Historical Wind Data
The time-series properties of the wind generation data are also important to the Study. Initial
data analysis revealed that the wind generation profies in the dataset were consistently
219
PACIFICORP - 2011 IR APPENIX I - WIN INRATION STUY
characterized by a slowly decaying auto correlation process, while their parial autocorrelations
are significant up to 6 period lags. In other words, the wind data in a ten-minute period is
heavily consistent with the previous 10-mIute interval and, therefore, over time, the wind
pattern could be described as influenced by its behavior in the previous time periods. Partial
correlatîon measures the autocorrelation at a specific lagged time frame, while controlling for the
effect of preceding lags. Paral autocorrelation is useful in deterrining the number of lagged
terms to include as explanatory varables in a regression modeL. Figues 6A though 9A show
the full and partial auto correlation factors for the Leang Juniper and Combine Hils wind
plants. Figues 6A and 7 A show that the predictive power fades regularly over time lag. Figues
8A and 9A show that the oscilating natue of wind generation is more apparent in the negative
predictive power of the 2nd and 4th lags.
Figure 6A. Autocorrelation coeffcients for successive ten minute lags in capacity factor for
Leaning Juniper.
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PACIFiCORP-20ll IRP APPENIX I - WIN INTEGRATION STUDY
Figure 7 A. Autocorrelation coeffcients for successive ten minute lags in capacity factor for
Combine Hils.
actor Outpu
Figure 8A. Partal autocorrelation coeffcients for lags in capacity factor for Leaning
Juniper.
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PACIFICORP - 20 11 IR APPENDIX I - WIN INTGRATION STUY
Figure 9 A. Partial autocorrelation coeffcients for lags in capacity factor for Combine Hils.
Factor Output(2007 -2009)
.. "~..W~~~~~H#"~~~~~~~.
A.3 Data Clean-up and Verification
The source wind generation data were characteried by a number of issues that needed data
clean-up, verification and, in some cases, adjustments. The first observed issue is that for certain
records over various periods of time, the historical wind output data were zero. Those
observations covered varying lengths of time and, in some instances, up to a few months.
However, we noticed that the zero-value data blocks consistently occured only at the beginning
of a wind project's chronological energy output data and therefore it is suspected that those were
probably periods when the plant had not yet been fully commissioned. Thus, those observations
are treated as "missing" and excluded them from the historical data set.
Next, through our source data review, we identified that the output of certin plants seemed to
have much smaller capacity factors and increased over time. This trend seemed to have extended
beyond the natual volatility of wind generation for those wind sites and showed up as a gradual
increase over time and reaching a maximum after a number of months. This observation seemed
to suggest that the historical data were captung the build-out of a wind site before it has reached
its commercial operation date. As the maximum available capability through wind plant
constrction on a daily basis was not documented, the decision was made to exclude wind output
data for dates prior to the known commercial operation date for each wid site. As a result, the
data set used for simulations was limited to include only date ranges that conform to the known
commercial operation dates shown in Table lA.
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P ACIFICORP - 2011 IRP APPENDIX I - WIN INTEGRATION STUY
Table lA. Summary of wind plant start dates and nameplate capacity.
Plant name
Applied Commercial
Operation Date
Nominal
Capacity (MW)
Observed
Max Output (MW)
Dunlap I
Goodnoe Hills
Glenrock
Glenrock III
Rolling Hills
High Plains
McFadden Ridge I
Leaning Juniper
Marengo I
Marengo II
Seven Mile Hill I
Seven Mile Hill II
Combine Hills
Wolverine Creek
Mountain Wind I
Mountain Wind II
Three Buttes
Top of the World
Spanish Fork
Foote Creek I
Foote Creek II
Foote Creek III
Foote Creek IV
Rock River
11/1/2010
5/31/2008
1/17/200
111
94
237
Data Unavailable
95
232
9/13/2009 99 148
10/10/2009 29 29
9/14/2006 101 103
6/26/2008 211 206
12/31/2008 119 123
6/17/2003 41 41
4/29/2005 65 65
9/29/2008 141 137
12/1/2009 99 Data Unavailable
12/31/2010 202 Data Unavailable
7/31/2008 19 22
4/1/1999 95 137
The sites that were affected by these revisions were:
. Goodnoe Hils (observations were set to missing for November 2007 through May 2008),
. Marengo (observations were set to missing for Februar 2007 through May 2008),
. Spanish Fork (observations were set to missing for April 2008 through Jul 2008),
. Mountain Wind (observations were set to missing for April 2008 through September
2008),
. Seven Mile Hil (observation were set to missing for November 2008 through December
2008),
. McFadden Ridge (observations were set to missing for June 2009 through September
2009),
. High Plains (observations were set to missing for February 2009 through August 2009),
. Glenrock (observations were set to missing for November 2008 though December 2008).
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PACIFICORP - 20 11 IR APPENIX I - WIN INTGRATION STUY
. That leaves five wind sites that were not affected by this adjustment -Leaning Juniper,
Combine Hils, Stateline, Wolverie Creek, and Foote Creek.
The second clean-up process involved understading the aggregation of data and the
interpretation of the plant size. The data provided to the technical advisor contained single wind
output data stream for sites that share the same pricipal name but are distinguished as individual
projects--those include Marengo and Marengo II, Mountain Wind and Mountain Wind II, Seven
Mile Hil and Seven Mile Hil II, Glenrock and Glenrock III. The wind output data, which were
collected on-site, did not distinguish between separate sharng the same name.
The third clean-up involved the fact that the maximum output levels observed in the wind output
data sometimes exceed the capacity officially available to PacifiCorp. The Study team decided to
use the maximum output found in. each wind profie data stream to be the de facto wind site
megawatt capacity. We used this capacity level and converted each 10-minute output into a
capacity factor value ranging from 0 to 1.28
A.4 Wind Data Simulation Methodology
A.4.1 General Description
The overall methodology centered on using available data to estimate the missing data. To do
so, the statistical relationships between pairs of sites were studied and those relationships were
used to derive or estimate the wind output for periods that historical data are incomplete or
missing. For example, if there was afully available set of historical data for site A, but partially
missing for site B, the overlapping periods durg which historical data are available for both
sites A and B were used to estimate the statistical relationship using that data. Then the technical
advisor employed that statistical relationship and used the available data from site A for the
period when site B has missing data to estimate wind data for that period. If site B has
completely missing data, the technical advisor applied NRL's simulated data (from 2004..2007)
to establish the statistical relationship between sites A and B and then applied that estimated
relationship to the historical data of site A and again, estimated site B' s wind output accordingly.
AA.2 Wind Generation Estimation Model Specifcation
In general, the modeling approach is based on the use of contemporaneously available ten-
minute wind capacity factor data from fully available wind profies to simulate capacity factor
data for profies with partially or completely missing wind output. As prior figues demonstrated,
ten-minute wind output exhibited a generally volatile profie with several notable featues. First,
output from previous periods is highly indicative of the curent level of output, with the partial
autocorrelations significant up to as many as six lags. Second, the diural patterns were harder
to discern on a consistent basis. Given these characteristics and our preliminary analysis, we
chose to include six lagged terms in addition to the concurent wind output term in the model
used to estimate the statistical relationship between pairs of sites. We have found that such
28 The capacity factor represents the output at a given point in time as a fraction of the maximum possible output for
the wind project. For example, a capacity factor of 0.23 indicates tht curent output is 23% of the total capacity of
the wind site.
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PACIFiCORP-20ll IR APPENDIX I - WIN INTGRATION STUY
specification allows us to captue the time-based behavior and time-dependence of the wind data
used in the Study. This approach also captues some of the spatial relationship between the two
sites-as wind moves from one site to the other, its impact on the other site is delayed in time.
The equation below describes the general strctue of the mode¡29:
S. A S' B S. B S' B S' B S' B S' B. S't Bitet = ao itet + ai itet_i + ai itet_i + a3 itet_3 + a4 itet_4 + as itet_S + a6 i et-6 + &
A.4.3 Wind Generation Estimation Model for Constrained Output
An importnt challenge in specifying this model is the natue of the capacity factor varables.
Capacity factor is used instead of absolute wind output levels to translate between small and
large wind plants. By such a constrction, the wind output measured in capacity factor terms can
only take values between 0 and i (or, equivalently 0% and 100%). Attempting to predict a
limited dependent variable using a standard linear ordinar least squares (OLS) approach
resulted in estimated values for the dependent variable (or sites with partially missing and
completely missing historical data) that are outside the possible value range.
For example, for given mean values of the explanatory variables, the linear OLS model might
result in a predicted mean dependent variable value greater than a capacity factor of 100%. This
is due to the fact that a linear OLS model does not limit the outcome range for the dependent
variable. In the literatue, a model whose dependent variable is limited at either one or both
upper and lower ends of its range is called a "censored" model.3o A standard approach for
estimating a censored model is to use the Tobit regression modeL. The Tobit model was
originally developed by James Tobin (1958)31 and employs an estimation technique, which
recognizes the limited ("censored") range of possible values that the observed dependent variable
can take.32 As a result, predicted mean values for the dependent variable wil behave as expected
and not exceed the natual capacity limits of 0 and l, as specified in our case.
The Tobit model uses a maximum likelihood process, which takes into account the probability of
obtaining an observation thàt lies inside the censoring interval. In other words, Tobit tyically is
used to estimate the likelihood of a value to be equal to some expected quantity. The model
assumes that the tre value of the dependent variable (y*) is explained by a number of
independent variables, where the regression error term (epsilon) is normally distributed with a
zero mean. In addition, if y* is between 0 and 1 we observe y*, however, if y*o:O we observe 0
and, similarly, ify*::l, we observe 1. The maximum likelihood estimation uses the Erobabilityof each individual observation being censored to estimate the regression coefficients. 3 In other
words, the regression coefficients are determined to ensure that their value maximizes the
likelihood of obtaining the observed values ofy*.34
29 We specify a regression model that has no constant term.
30 Greene, Wiliam H., "Econometrc Analysis", 5th Ed., Prentice Hall 2003, p. 764.
31 Gujarati, Damodar N., "Basic Econometrcs", McGraw Hil 2003, p. 616; Kenedy, Peter "A Guide to
Econornetrcs," 5th Ed., MIT Press 2003, pp. 289-290.
32 Ibid.
33 For example, see "STATA Base Reference Manual Release 11", Stata Corp. pp. 1939-1948; Maddala, G. S.,
"Limited-Dependent and Qualitative Varables in Econometrcs.", Cambridge University Press 1986, pp.159-162.34 For more detailed description of the Tobit model, please see Maddala, G. S., "Limited-Dependent and Qualitative
Varables in Econometrcs", Cambridge University Press 1986, pp.159-162.
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PACIFICORP - 2011 IR APPENDIX I - WIN INTGRATION STUY
In contrast to linear OLS regression, the Tobit regression model does not report an R-squared
metrc, which tyically indicates the explanatory power of the regression model specification
(with high R-squared value indicating stronger explanatory power). In other words, in the linear
OLS regression, the adjusted R-squared measures the proporton of variance of the dependent
variable that has been explained by the independent (right-hand-side) varables. There are a
range of so-called "Pseudo R-Squaed" metrcs that have been proposed in the literatue for use
with maximum likelihood models, such as the Tobit modeL. However, their interpretation is not
equivalent to the R-Squared in OLS. This is because estimates derived using a Tobit model are
calculated via an iterative process designed to maxime the likelihood of obtaining the
observations of the dependent varable, rather than to minimize variance.35
The technical advisor used the statistical softare package STAT A(Ç to perform the regressions
using the Tobit modeL. The model specification uses the chosen explanatory variables and
generates a censored prediction of y* where the relevant upper and lower censoring limits are
taken into account.36 An example of the six-lag model the technical advisor settled upon for
significance is below:
Goodnoe; = aoLeaningJun iper/ + a¡ LeaningJun ipert~¡ + aiLeaningJun ipert~i +
+ a3LeaningJun ipert~3 + a4LeaningJun iper'~4 + as LeaningJun ipert~S + a6LeaningJun ipert~6 + &
A.4.4 Using NREL's Wind Data to Facilitate Wind Simulation for Sites without Historical
Information
To simulate wind data of sites with no historical information, the technical advisor used the
NREL wind data to estimate the statistical relationship between pairs of sites and then used the
estimated relationship to simulate the necessary wind data. For sites with completely missing
historical wind data, NRL sites are chosen to serve as a proxy wind profies.
NREL's Western Wind Dataset was created by 3TIER for use in NREL's Western Wind and
Solar Integration Study. The dataset was synthesized using numerical weather prediction (NP)
models "to recreate the historical weather for the western U.S. for 2004, 2005, and 2006. The
modeled data were temporally sampled every i 0 minutes and spatially sampled every arc-minute
(approximately 2 kilometers).'.3 We refer to this wind data set as the "NREL data".
The first step in using the NREL Western Wind Dataset is to identify NREL-modeled sites that
are the closest in geographical terms to the relevant PacifiCorp wind sites. These are called the
"NRL proxies" for each corresponding PacifiCorp wind site. The technical advisor then
estimated the statistical relationship between the pairs of NREL proxies (that correspond to
PacifiCorp wind sites) and used the statistical relationship to carr out the rest of the simulation
35 For rnore information, please see: Long, 1. Scott. "Regression Models for Categorical and Limted Dependent
Varables" Thousand Oak: Sage Publications, 1997; Freese, Jererny and 1. Scott Long. "Regression Models for
Categorical Dependent Varables Using Stata", College Station: Stata Press, 2006.36 For more infonnation, please see: Baum, Chrstopher F., "An Introduction to Modem Econometrcs Using Stata",
College Station: Stata Press, 2006, p. 264.37 http://vv'\vw.lUeLgov/wínd/integrationrlatasets/westernmethodologv;html#methodology (accessed July 1,2010)
226
PACIFiCORP-20ll IR APPENDIX I - WIN INTEGRATION STUDY
described above. PacifiCorp staff provided the technical advisor with the geographical
coordinates (latitude and longitude) for the PacifiCorp wid sites as sumarized in Table 2A.
In addition, the NREL data contains comprehensive information on the geographical coordinates
of all modeled sites.38 The technical advisor then determined the closest NREL proxy for each
ofplant.39
Table 2A. NREL Proxies selected for pertnent PacifCorp plants.
PacifiCorp Plant Name Closest NRL Site il Distance (kI)
High Plains
McFadden
Rock River
Rollng Hils
Dunlap
Three Buttes
Top of the World
16676 0.516676 0.531422 0.423909 2.919280 0.823870 5.323803 4.8
Table 2A shows each PacifiCorp-NREL pair and the calculated distance between them. We
should note that High Plains and McFadden Ridge share the same geographical location and, as a
result, are paired with the same NREL-modeled site. As a result, High Plains and McFadden
Ridge have identical simulated profies. (This is a fuction of the study's approach of simulating
wind generation output based on geographical location rather than wind project name~for
example, the same simulated profile is also used to represent the Mountain WindIountain Wind
II pair of wind sites.)
After determining the set of NREL sites to be used in the simulation analysis, NREL data were
formatted, compiled by site, and labeled using their PacifiCorp counterpart's name. Similar to
the earlier approach in formatting the PacifiCorp data, NREL wind output data were converted
into capacity factor terms (using a 30 MW capacity value for each site as specified in the NRL
description of the dataset).4o
38 The rnain web portal for the NRL Western Wind Dataset can be accessed at http://wind.nrel.goviWeb nrel
39 Geographical coordinates for two points on the earh's surface can be converted to a straight-line distance using a
range of alternative algoriths, which take into consideration the shape of the eart and use trgonornetrc formulas
to project and rneasure surface distances. For the puroses of this study, the Spherical Law of Cosines was used to
calculate the distance between each relevant PacifiCorp wind site and every site in the Western Wind Dataset. Fore
rnore information, please see: Weisstein, Eric W. "Spherical Trigonometr." From MathWorld -- A Wolfram Web
Resource. litt:l/mathworld.wolfram.com/SphericalTrigonoinetrv.litmJ (accessed July 1, 2010)
Distace (kI) == ArcCos( Sin(Latitude Pacificorp) * Sin(Latitude NRL) + Cos(Latitude Pacificorp) *
Cos(Latitude NRL) * Cos(Longitude NRL - Longitude Pacificorp)) * 6371 kI
40 http://www.nreL.gov/windlintegrationdatasets/about.html (accessed July 1,2010)
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PACIFICORP - 2011 IR APPENDIX I .. WIN INTEGRA nON STUY
A.4.5 Pairing of Wind Profiles Usedfor Regression
Recognizing the monthly seasonality of wid data, each modeled pair required twelve separate
regression models per year, one for each month.41 To ensure the use of observed historical wind
data is meaningful, we require that a full year of overlap between a fully available wind profie
and a partially missing wind profile. This means that if the partially missing wind profile only
had 11 months of historical data, it was treated as a completely missing dataset and used the
NREL data to help simulate the data from the period without historical data. To simplify the rest
of this explanation, the fully available wind profile was a predictor and a site with partially
missing or completely missing wid profile was a predicted site (because the process effectively
used the available profie to "predict" the missing profie).
The Study focused on two methods in estiatig monthy regressions. First, for sites with
partially missing historical wid data that have at least 12 months of historical data, the data
from afully available site was employed as the predictor (such as Foote Creek, Combine Hils,
or Leaning Juniper) to estimate monthly coeffcients. From the coefficients derived in the
regression estimation, the Study estimated the wind data for all the missing months. Second, for
sites with partially missing data (and with less than 12 months historical data available) and sites
with completely missing data, the NRL closest neighbor set of wind profies was employed.
The process estimated monthly regression models between the closest NREL site to the predictor
and the closest NRL site to the predicted. Then the coefficients estimated in those regressions
were applied to the PacifiCorp fully available predictor data to simulate 1O~minute output data
for the predicted. This second approach implicitly assumed that the monthly relationships
between the predictor and the predicted derived from the 2004-2006 period (using available
NRL data) were applicable to the Initial Term as represented by the PacifiCorp data.
Below in Figue lOA, a flow char depicts the steps described above. Table 3A depicts the pairs
of wind sites with left colum containing the predictor and the right column containing the
predicted.
41 For example, if overlapping data for the predictor and the predicted are available for all of2008 and 2009, we
estimate a regression for January using data for that month from both 2008 and 2009. Then, the estimated
coeffcients from the regression wil be used to predict the output for January of2007 using the predictor 2007 data
for that rnonth.
228
PACIFICORP - 2011 IR APPENDIX I - WIN INTGRATION STUY
Figure lOA. Wind generation data development flow chart.
Methods of Wind Data Simulation
Method B: Sit wih Completely Missing Data (or less than 12 montbs historical data)Method A: Site with PartaUy Missing Data (with at leat 12 months bitorica data)
Table 3A. Pairs of wind projects used in data simulation.
Predicted Data UsedPredictor
High Plains
McFadden
Rock River
Rolling Hils
Dunap
Three Buttes
Top of the World
Goodnoe
Marengo
Mountain Wind
Seven Mile Hil
Spanish Fork
Glenrock
Foote Creek
Foote Creek
Foote Creek
Foote Creek
Foote Creek
Foote Creek
Foote Creek
Leaning Juniper
Combine Hils
Foote Creek
Foote Creek
Foote Creek
Foote Creek
NRLlPacifiCorp
NRELlPacifiCorp
NRL/PacifiCorp
NRLlPacifiCorp
NRLlPacifiCorp
NRLlPacifiCorp
NRLlPacifiCorp
PacifiCorp
PacifiCorp
PacifiCorp
PacifiCorp
PacifiCorp
PacifiCorp
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P ACIFICORP - 2011 IR APPENIX I - WIN INRATION STUY
A.4.6 Regression Analysis
The estimation process of the Tobit regressions was identical across all sites-the six-lag model
is applied to a predictor-predicted pair. After estimation, the resulting coefficients were used to
generate data for the predicted profie for all missing time periods using the values of the
predictor in those time periods.42 A sample of resulting regression coeffcients for one month for
one pair of wind sites is shown in Table 4A below.
Table 4A. Predictive capacity factor coeffcients for the simulation of Goodnoe Hils wind
generation using Leaning Juniper actual generation data.
Explanatory Varables Estimated Coeffcients
Capacity Factor Leang Juniper 0.841 ***
(0.0744)
-0.321**
(0.130)
0.0314
(0.135)
0.0631
(0.135)
0.0597
(0.135)
0.00342
(0.130)
0.267***
(0.0744)
Capacity Factor Leaning Junper (t-l)
Capacity Factor Leaning Junper (t-2)
Capacity Factor Leaning Junper (t-3)
Capacity Factor Leang Junper (t-4)
Capacity Factor Leanig Junper (t-5)
Capacity Factor Leaning Juniper (t-6)
Observations 4,464
Not~: Stadad errors in parentheses.
*** p-CO.Ol, ** p-c0.05, * p-CO.1
A.4. 7 Esnmate Mean Values of the Predicted
In general, using the estimated regression coefficients to derive a prediction for the dependent
varable is done by using the mean values of the explanatory variables to arrve at the predicted
mean value of the dependent variable. In this case, however, we are interested in generating
predicted values of the dependent variable (predicted) for all individually observed values of the
independent varable (predictor). As a result, applying the estimated regression coefficients to
each individual observation of the explanatory varables wil result in predìcted values of the
predicted that are significantly less variable than the tre unobserved predicted series. This is
due to the fact that the regression model assumes that the regression error is zero on average
across the observations, but not in every individual instance. An ilustrative comparison of the
predicted mean value to the historical actual of the same period is shown in Figue llA.
42 Again, all estimation procedures and simulations were conducted using the cornercially-
available statistical softare package STATA(Ç (http://www.stata.com)
230
l:
P ACIFICORP - 2011 IR APPENIX I - WIN INTEGRATION STUY
Figure llA. Comparison of actual Goodnoe Hils capacity factors with predicted mean
Goodnoe Hils capacity factors derived off of Leaning Juniper generation data.
--~Goodne Acal
.. . Goodnoe TOBIT
100%
90%
80%
70%i.=..r.600/0=~
È 50%
r.=Q.40%=U
30%
20%
10%
0%N =GO..=...;0:.;..'"'"'"======N ~~õ'"~~~.-
Actu and Prdicted Capaci F)ictors
\C ..N =GO.-N ..=...;.;.;0:.;
'"....'"'"=CO '"=======~==~!:=.~~..-~==~~.-~~.-.-.-.-
A.4.8 Calculating the Regression Residuals
To address the loss of variability by simply using the regression coefficients in the estimation,
the technical advisor subtracted the predicted values of the dependent variable from their
corresponding observed values over the overlapping subset of predicted/predictor data used for
the regression estimation.43 This produced a set of regression residuals, which represent the
amount by which predicted values for the known (historical) part of the data set were different
from the actual observed values of the predicted.
Then, each regression residual value was categorized according to the level of predicted output it
was originally associated with. The predicted values are then grouped in bins of 10 percentage
points to create 10 bins that cover the range of 0% to 100% capacity factor output. For example,
all residuals that were associated with a predicted output between 10% and 20% are grouped
together. As Figues 12A and 13A show, the distributions of those residuals var across bins.
43 In the case of the PacifiCorp sourced data, this is done over the rnonthly regression data. For the Hybrid approach
where NRL data was required, this is done with the NRL data.
231
PACIFiCORP-20ll IRP APPENDIX I - WIN INRATION STUY
Figure 12A. Highly non-normal residuals from bin 5 of the March regression of Goodnoe
Hils capacity factor derived from observed Leaning Juniper data.
bution of Regression Residuals Bin#S
Goodnoe Predict by leaning Juniper (Marc Regresion)
Figure 13A. Highly non-normal residuals from bin 7 of the March regression of Goodnoe
Hills capacity factor derived from observed Leaning Juniper data.
Residuals Bin
Juniper (Marc Regr
A.4.9 Sample of Residuals According to Simulated Output Ranges
The next step involved randomly drawing residuals from the previously defined bins and "adding
them back" to the simulated mean lO-minute wid output. The procedure of making random
232
PACIFiCORl., 2011 IR APPENDIX I - WIN INTEGRATION STUDY
draws from an empircal distrbution of residuals is called "bootstrapping" residuals.44 In the
context of this study, the technical advisor applied the bootstrapping procedure by randomly
drawing 45 a residual from a corresponding bin and adding it to the predicted mean capacity factor
value. For example, if a predicted capacity factor value for a missing data point falls within the
i 0% to 20% interval, a residual value wil be randomly drawn from the bin that contains the
residuals of the corresponding capacity factor of the historical data when compared with the
simulated (or predicted) mean values.
A.4.10 Application of a Non-Linear 3-Step Median Smoother to the Sampled Residuals
After generating a time-series of bootstrapped residuals, the additional step of applying a non-
linear smoother to the series, called the "span-3 median smoother" was taen. The span-3
median smoother is a process by which the median of the curent, previous, and next period
value - in this case, it is calculated by takig the median of residual(t-l), residual(t),
residual( t+ i )46 - and using that median as the residual for the current period. The purose of
this approach is two-fold. Firstly, the median smoother ensures that the time-series of residuals
resembles the time behavior of wind more closely, with lags affecting the instantaneous results.
Secondly, the span-3 median smoother introduces a time-dependency to the data set, which is
known to exist in the original wind data.47
The technical advisor then added the smoothed time-series of the randomly drawn residuals to
the predicted mean capacity factor values for each ten-minute point; then checking the resulting
data to make sure the estimates remained within the 0 ~ i 00%. capacity factor range.
44 This name alludes to the
fact that, absent prior knowledge of the distrbution, the researcher has to pull herself by
the bootstraps by drawing randomly frorn the empircally-derived residual data in order to generate residuals.45 Random drws are done with replacernent as irnplernented by the STATA(Ç bsample procedure.
46 For exarnple, see "STATA Base Reference Manual Release 11", Stata Corp. p. 1758; Mosteller, F. and Tukey,
John W., "Data Analysis and Regression: A Second Course in Statistics", Addison-Wesley: 1977., pp. 52-58.
47 Although the non-linear srnoothing approach does not exactly replicate the auto~regressive behavior of the wind
data, it introduces sorne similar dependency.
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PACIFiCORP-2011 IR APPENDIX I - WIN INGRATION STUY
Regression Coefficients and Relative Signifcance
Regression Results by Month for Glenrock Predicted by Foo Creek
Capacity Factor Foote Creek It)
Capacity Factor Foote Crek (t-I)
Capacity Factor Foote Crek It-2)
Capacity Factor Foote Creek (t-3)
Capacity Factor Foote Crek (t-4)
Capacity Factor Foote Creek It-5)
Capacity Factor Foote Crek It-6)
Number of Observations
Note: Standar errs in parentheses.
u* p-CO.OI, ** p"'.05, * p"'.l
Regression Results by Month for Spash Fork Preccte by Foo Creek
lanatory Varbles
Capacity Factor Foote Creek (t)
Capacity Factor Foote Creek (t- i)
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crek (t-3)
Capacity Factor Foote Creek(t-4)
Capacity Factor Foote Creek (t-5)
Capacity Factor Foote Creek (t-6)
Number of Observations
Note: Standard errs in parentheses.
*** p"'.Oi, ** p"'.05, * p-cO.i
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P ACIFICORP - 20 11 IRP APPENDIX I - WIN INTEGRATION STUY
Regression Res nits by Month for Se\en Mle mil Predcted by Foo Creek
laato Vanables
Capacity FactOr Foote Creek (t)
Capacity Factor Foote Creek (t-J)
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crk (t-3)
Capacity Factor Foote Creek (t-4)
Capacity Factor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6)
Number of Observations
Note: Standard errrs in parntheses.
... p"'.Oi, .. p"',05, · p"'O.1
Regression Res nits by Month for Monntain Wind Predicted by Fooe Creek
Capacity Factor Foote Crek (t)
Capacity Factor Foote Creek (t-J)
Capacity Factor Foote Creek (t-2)
Capacity Factor Foote Creek (t-3)
Capacity Factor Foote Creek (t-4)
Capacity Factor Foote Crek (t-5)
Capacìty Factor Foote Creek (t-6)
Numer of Observations
Note: Standar errors in parentheses.
... p"'.Oi, .. p"'O..05, · p"'O.i
235
P ACIFICORP - 2011 IRP APPENDIX I - WIN INTGRATION STUY
Regression Res u1ts by Minth for Maengo Predicted by Combne HiDs
Ianato Variables
Capacity Factor Coniine Hi (t)
Capacity Factor Coniine Hi. (t-I)
Capacit Factor Coniine Hi (t-2)
Capacit Factor Coniine Hi (t-3)
Capacity Factor Coniine Hi (t-4)
Capacity Factor Coniine Hi (t-5J
Capacit Factor Coniine Hi (t-6
NunierofObservations
Note: Standar errs in parntheses.
*** p4l.01. ** p4l.05. * p""O.1
Regress ion Res u1ts by Month for Gooe Predicted by Leanng J nnper
Capacity Factor Leaning Juniper (t)
Capacity Factor Leaning Juniper (t-I)
Capacity Factor Leaning Juniper (t-2)
Capacity Factor Leaning Juniper (t-3)
Capacity Factor Leaning Juniper (t-4)
Capacity Factor Leaning Juniper (t-5)
Capacity Factor Leaning Juniper (t-6)
Number of Observations
Note: Standar errrs in parntheses.
*** p""O.OI, ** p4l.05, * p4l.!
236
PACIFiCORP-201l IR APPENDIX I - WIN INTEGRATION STUDY
Regression Results by.Month for Top of th World Predcted by Foote Creek
Capacit Factor Foote Creek (t)
Capacity Factor Foote Crek (t- i)
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crek (t-3)
Capacity Factor Foote Creek (t-4)
Capacit Factor Foote Creek (t-5)
Capacity Factor Foote Crek (t-6)
Number of Observations
Note: Standard erors in parntheses.
... p"Ü.Ol, .. p"Ü.05, . p"Ü.I
Regression Results by Month for Three Butts Predcted by Foo Creek
Capacity Factor Foote Creek (t)
Capacity Factor Foote Creek (t-I)
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crek (t-3)
Capacity Factor Foote Crek (t-4)
Capacity Factor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6
Numer of Observations
Note: Standard errrs in parentheses.
... p"Ü.OI, .. p"Ü.05, . p"Ü.I
237
PACIFICORP - 2011 IR APPENDIX I - WIN INTGRATION STUY
Reression Resolts by Mitl fur Duap Predcted by Fooe Creek
Ianato Varbles
Capacit Factor Foote Crek (t)
Capacit Factor Foote Crek (t-1)
Capacit Factor Foote Crek (t-2)
Capacit Factor Foote Crek (t-3)
Capacit Factor Foote Crek (t-4)
Capacit Factor Foote Crek (t-5)
Capacity Factor Foote Creek (t-6)
Number of Observations
Note: Standaid errrs in parntheses.
... p""O.OI... p4l.05,. p""O.1
Regression Results by Montl for Rollng Hills Predcted by Foote Creek
laato Varbles
Capacity Factor Foote Crek (t)
Capacity Factor Foote Crek (t-IJ
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Creek (t-3)
Capacity Factor Foote Crek (t-4)
Capacity Factor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6)
Number of Obserations
Note: Standaid errrs in parntheses.
... p4l.01, .. p4l.05, . p4l. I
238
PACIFICORP - 2011 IR APPENIX I - WIN INTEGRATION STUY
Regression Resnlts by Month for Rock rowr Predcted by Foote Creek
Capacity Factor Foote Crek (t)
Capacit Factor Foote Crek (t-IJ
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crek (t-3)
Capacity Factor Foote Creek (t-4)
Capacity Faetor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6)
Nutler orObservations
Note: Standard errrs in parentheses.
... p"l.Ol. .. p"l.05, . p"O.\
Regression Resnlts by Month for McFadn Predicted by Foo Creek
EJlaatory Varbles
Capacity Factor Foote Crek (t)
Capacity Factor Foote Crek (t-l)
Capacity Factor Foote Crek (t-2)
Capacity Factor Foote Crek (t-3)
Capacity Factor Foote Crk (t-4)
Capacity Factor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6)
Nutler of Observations
Note: Standard errrs in parentheses.
... p"l.OI, .. p"O.05, . p"l.\
239
PACIFICORP - 20 11 IRP APPENIX I - WIN INGRA nON STUDY
Regression Results by Month for Higb Plains Predicted by Foo Creek
Capacit Factor Foote Crek (t)
Capacity Factor Foote Crek (t-I)
Capacity Factor Foote Creek (t-2)
Capacity Factor Foote Crk (t-3)
Capacity Factor Foote Crek (t-4)
Capacity Factor Foote Crek (t-5)
Capacity Factor Foote Crek (t-6)
Number of Obseivations
Note: Standar errrs in parntheses.
... p",O.OI, .. p.q.05, · p.q.i
240
PACIFCORP-20ll IRP APPENIX I - WIN INTEGRATION STUDY
Operating Reserve Demand Seasonal Detail
This Appendix presents the monthly component operating reserve service demand calculated for
the PacifiCorp East and West Balancing Authority Areas in the Study. The 1,372 MW and 1,833
MW penetration scenarios include some simulated wind data; the load-only and 425 MW
penetration scenarios do not.
Table Cl.West Balancin~ Authority Area, Load 0
Load Following Regulationll.Q :Y Down
January 127 129 125 82
February 93 103 111 73
March 114 115 109 77
April 84 87 103 65
May 93 101 95 72
June 82 83 78 63
July 93 96 69 64
August 79 84 65 60
September 96 104 88 64
October 83 83 98 62
November 149 166 127 95
December 125 116 101 86
nly
Table C2.West Balancin2 Authority Area, 425
Load Following Regulation~Down :Y Down
January 132 134 131 91
February 104 110 117 82
March 128 124 118 92
April 96 96 110 78
May 108 109 102 84
June 103 96 88 80
July 110 105 78 79
August 98 94 76 77
September 105 107 94 73
October 97 88 104 74
November 157 169 133 103
December 132 121 106 94
MW
241
PACIFICORP - 2011 IR APPENIX I - WIN INTEGRATION STUY
Table C3. West Balancin2 Authority area, 1,372
load Following Regulation
yg Down ~.Q
January 153 150 171 139
February 122 122 152 129
March 160 152 152 140
April 133 122 150 121
May 135 131 136 123
June 131 123 127 118
July 128 122 110 104
August 118 113 103 104
September 125 121 118 101
October 124 105 126 104
November 181 180 152 131
December 159 138 142 131
MW
Table C4. West Balancin2 Authority area, 1,833
load Following Regulation
yg Down ~Down
January 153 150 171 139
February 124 124 152 129
March 162 154 152 140
April 136 123 150 121
May 137 133 136 123
June 133 125 127 118
July 129 123 110 104
August 120 115 103 104
September 126 122 118 101
October 125 106 126 104
November 182 180 152 131
December 161 139 142 131
MW
242
PACIFiCORP-20ll1R APPENDIX I - WIN INTEGRATION STUY
c nlyTable5. East Balancin~ Authority area, Load 0
Load Following Regulation
~Down ~Down
January 127 131 150 110
February 117 122 131 98
March 135 138 122 102
April 105 103 145 95
May 146 145 133 114
June 143 152 134 114
July 157 155 130 112
August 162 162 122 111
September 144 162 127 105
October 139 146 116 97
November 154 164 161 110
December 145 149 182 112
Table C6. East Balancin2: Authority Area, 425
Load Following Regulation~Down ~Down
January 132 135 152 113
February 120 125 134 101
March 139 142 124 105
April 112 107 148 99
May 151 148 137 118
June 148 155 137 118
July 161 157 132 115
August 165 164 124 114
September 149 165 130 109
October 143 150 119 101
November 158 168 163 113
December 150 154 185 116
MW
243
PACIFiCORP-2011 IRP APPENIX I - WIN INTGRATION STUDY
Table C7. East Balancine Authority Area, 1,372
Load Following Regulation
.I Down .I ~
January 187 193 201 175
February 201 195 210 189
March 212 2æ 207 200
April 193 174 212 182
May 204 184 183 179
June 205 192 189 185
July 205 177 170 172
August 204 187 164 166
September 219 203 185 177
October 218 211 202 192
November 230 227 232 197
December 212 228 253 207
MW
TableC8. East Balancine Authority area, 1,833
Load Following Regulation
.I Down .I Down
January 240 262 250 241
February 256 262 264 247
March 247 247 235 236
April 236 213 243 223
May 228 205 203 202
June 232 210 204 202
July 220 185 177 183
August 216 197 176 179
September 245 222 201 199
October 257 251 235 230
November 276 290 279 259
December 291 299 300 266
MW
244
PACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
ApPENDIX J - STOCHASTIC Loss OF LOAD STUDY
PacifiCorp evaluates the desired level of capacity planning reserves for each integrated resource
plan. For the 2011 IRP, the Company conducted a stochastic loss of load study to help identify
the taget capacity planning reserve margin (PRM) to use for resource portfolio development.
This study utilized the Company's stochastic production cost simulation system, Planing and
Risk (PaR), to determine the relationship between PRM and resource adequacy as measured by
Loss of Load Probability (LOLP) index. Loss of load probability represents the probability that
generation in a given hour is insufficient to serve load. Accumulating the number of hours for
which the system experiences unserved load over a given period, tyically one year, yields the
LOLP index. Once the relationship between LOLP and PRM is established for PacifiCorp's
system, a target LOLP level is selected to determine the PRM for subsequent resource portfolio
development. This report. describes the loss of load study and modeling assumptions, the
selection of a target loss of load criterion, and the (ldoption of a PRM for portfolio development.
The last comprehensive stochastic study conducted was for PacifiCorp's 2004 IRP.48 Major
differences between this study and the last one include (1) significantly more wind resources and
incorporation of incremental wind operating reserves in the resource portfolio simulations, (2)
expansion of the transmission topology from two bubbles to 26, and (3) incorporation of energy
efficiency programs as a resource with a reserve credit rather than a reduction to the load
forecast.
Note that while this study reports the incremental resource cost for achieving a given loss of load
frequency and associated reserve margin level using a standard reliability resource tye, it does
not assess the trade-off between reliabilty and cost or the optimal resource mix to achieve a
given reliability leveL. PacifiCorp compares different resource portfolios based on the amount
and cost of unserved load (megawatt-hours of "Energy Not Served" or ENS) resulting from
stochastic simulations of many portfolios built to meet a given PRM leveL. This stochastic
analysis reveals the reliabilty impacts and costs associated with different resource mixes.
The metrc used to derive the LOLP index is Loss of Load Hours (LOLH). The PaR model
records a LOLH event when load is not met for an hour. This condition results from unit outages
that reduce available generation capacity in a load area below the load derived from the Monte
Carlo draws conducted by the PaR modeL. The LOLH event also has an associated Energy Not
Served value, which is the magnitude of the lost load for the hour.
48 See Appendix N of the 2004 IRP Technical Appendix Volume.
245
PACIFICORP - 2011 IRP APPENDIX J - STOCHASTIC Loss OF LOAD STUY
The PaR model's reported LOLP index is the average number of LOLH events for PacifiCorp's
100-iterationMonte Carlo production cost simulation. This measure is thus a likelihood of
experiencing a shortfall in any given hour for the stochastic Monte Carlo simulation.49
PacifiCorp selected 2014 as the simulation test year for the LOLP study. This year aligns with
the start of the 2014-2016 resource acquisition period targeted by the Company's All Source
RFP issued to the market on December 2, 16 2009. This year also aligns with major planned
Energy Gateway transmission additions: the Mona-Oquirh segment of Energy Gateway Central
by June 2013, and the Sigud-Red Butte segment by June 2014.
The LOLP modeling approach entailed adding incremental reliability resource capacity to a
starting point resource portfolio to reach increasingly higher target PRM levels. Loads and
resources reflect those of the September 21, 2010 preliminar caJgacity load & resource balance,
as presented at the October 5, 2010 IRP public input meeting. 0 This balance uses the annual
system coincident peak load forecast prepared in September 2010 for use in the Company's 2011
business plan. The starting PRM level was 8.3 percent, which covers system operating reserve
requirements (contingency and regulating reserves). Reliability resource capacity was then added
to reach planning reserve margin levels of approximately 10 percent, 12 percent, 15 percent, and
18 percent. PacifiCorp conducted stochastic Monte Carlo simulations for each of the five
resource portfolios built to achieve the taget PRMs. The stochastic simulations account for
Western Electrcity Coordinating Council (WECC) operating reserve obligations plus
incremental operating reserves for existing and forecasted wind additions as of year-end 2013.
PacifiCorp then extracted LOLH and associated LOLP statistics from the portfolio simulations to
characterize the reliabilty impacts of the incremental reliability resource capacity.
PacifiCorp used an intercooled aeroderivative simple-cycle combustion tubine (IC aero SCCT)
as the reliability resource for the loss of load study. Starting from a portfolio with approximately
a zero PRM, IC aero SCCT capacity blocks were added to PacifiCorp's East and West Balancing
Authority Areas-PacifiCorp East (PACE) and PacifiCorp West (PACW)-until reaching the
desired PRM. The capacity build-up includes 77 MW of non-owned reserves held for other
paries located in PacifiCorp's Balancing Authority Areas, and accounts for the treatment of
dispatchable load control (Class 1 DSM), interrptible load contracts, and purchases in the
49 Calculating a probability using LOLH is a variant of
the Loss of Load Expectation (LOLE) statistic.
50 The prelirninar 2011 IRP capacity load and resource balance is reported on page 45 of the meetig presentation,
which can be downloaded at:
htt://\\'Ww.pacificorp.comlcontent! dampacificorp/ doc/Energy Sources/lntegrated Resource Plan/20 11 IRP lPacifi
Corp 20 i lIRP PIM4 1O-05-10.pdf
246
PACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
calculation of the reserve margin (See Chapter 5 for more details). Additionally, since the
capacity balance uses a load forecast before energy effciency (Class 2 DSM) load reductions are
applied (the "pre-DSM" load forecast), PacifiCorp included a reserve credit for the incremental
307 MW of Class 2 DSM capacity added by 2014. Modeled SCCT units were sized as follows
by Balancing Authority Area:
. PacifiCorp East Units - 93 MW (1 unit), 186 MW (2 Units), 279 MW (3 Units)
. PacifiCorp West Units - 102 MW (1 unit), 205 MW (2 Units), 307 MW (3 Units)
Regarding resource placement, PacifiCorp added SCCT capacity to transmission areas as
dictated by PRM needs, with most resources placed in the West Main ("West Units") and Utah
North ("East Units") transmission areas. Table 1.1 shows the megawatt capacity added to reach
the taget PRM levels. Since capacity is added in blocks, the resulting PRM levels vary from the
original target levels.
Table J.1 - Resource Capacity Additions Needed to Reach PRM Target Levels
East 3 Unit 837 1,116 1,116East 2 Unit 186 0 186East 1 Unit 0 0 0Goshen 186 186 186West 3 Unit 0 0 307West 2 Unit 0 205 0West 1 Unit 102 0 0Walla Walla 102 102 102
Total IC Aero SCCT Ca aci 1,413 1,609 1,897
DSM with Reserve Credit 332 338 344Total Ca aci Added* 1,745 1,947 2,241
* Excludes non-owned reserves held for other paries within PacifiCorp's servce terrtory.
1,395
o
93
186
307
o
102
102
2,185
353
2,539
1,674
o
o
186
307
o
205
102
2,474
362
2,836
Figue 1.1 shows the relative magnitude of existing resources, the load obligation plus sales, and
resources with incremental reserves required to reach the taget PRM.
247
P ACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.t - Existing Resources, Loads & Sales, and Resources with Reserve Requirements
16,000
15,500
15,000
14,500
14,000
13.500
~ 13,000
~ 12,500m 12,000
gi 11,500
:i 11,00010,500
10,000
9,500
9,000
8,500
8,000
..............._.........__._........._........-.............-..
~r#/#//~~#~#//#ÆWÆfAØff#Æ'Æ'._...~__
8.3%10.2%12.8%15.5%18.3%
~ Requirement with Planning Reserves ..Loads and Sales ..-Existing Resources
For the loss of load study, the PaR model is configued to conduct 100 Monte Carlo simulation
rus. Durng model execution, PaR makes tie-path-dependent Monte Carlo draws for each
stochastic variable. The stochastic varables include regional loads, unit outages, hydro
availabilty, commodity natual gas prices, and wholesale electrcity prices. In the case of natual
gas prices, electrcity prices, and regional loads, PaR applies Monte Carlo draws on a daily basis.
Figues 2 through 9 show. a sample of first-of-month daily loads by transmission area resulting
from the Monte Carlo draws. In the case of hydroelectrc generation, Monte Carlo draws are
applied on a weekly basis. '
Twelve representative weeks for each month, including the July system peak week, were
modeled on an hourly b(lsis. This representative-week approach reduces the model ru-time
requirements while ensurg that unit dispatch durg the critical capacity planning periods is
captued in the system simulations. Since only one year was simulated, the stochastic model's
long-term stochastic parameters were tued off.
248
P ACIFICORP - 2011 IRP APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.2 - Utah North Load Area
Figure J.3 - Utah South Load Area
Figure J.4 - Walla Walla, Washington Load Area
249
P ACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.5 - West Main (Oregon, Northern Caliornia) Load Area
Figure J.6 - Yakima Load Area
Figure J.7 - Goshen Idaho Load Area
250
PACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.8 - Northeast Wyoming Load Area
Figure J.9 - Southwest Wyoming Load Area
As par of the WECC, PacifiCorp is currently required to maintain at least 5 percent and 7
percent operating reserve margins on hydro and thermal load-serving resources, respectively.
The Northwest Power Pool (NP) also requires a 5 percent operating reserve margin on wind.
In the PaR model, operating reserves are modeled as a fuction of load. The maximum reserve
amount that each generating unit can car is specified in the modeL. The PaR model also
includes 1.6 percent ofloads to cover the WECCregulating reserves requirements. The operating
reserve percentages, exclusive of wind, equate to 8.6 percent for the East Balancing Area and 8.1
percent for the West Balancing Area. These operating reserves are split into, roughly, 60-percent
spining and 40-percent non-spining reserves to comply with WECC spinning and non-
spining reserve requirements.51 An additional 14 percent incremental operating reserve
51 At least half of the operating reserves must be Spinning Reserve. Spining reserve is the margin of generating
capacity available to replace 10st capacity and provide the regulatig rnargin to follow load; spining capacity rnust
251
PACIFICORP - 2011 IRP APPENDIX J - STOCHASTIC Loss OF LOAD STUY
requirement is applied against nameplate wind capacity (211 MW to cover incremental
operating reserves for wind as determned by PacifiCorp's 2010 wind integration study.
The operating reserve modeling approach does not address the impact of resource tye (i.e.,
hydro, wind, or thermal) in determining required operating reserves. Operating reserves count
toward the PRM, but the required percentages for the Balancing Authority Areas (8.6 percent
and 8.1 percent) stay constant regardless of resource mix.
All Balancing Authorities with the Nortwest Power Pool are also required to paricipate in the
Contingency Reserve Sharg Progr. This progrm provides 60-minute recovery assistance
following the loss of a generatig resource or transmission path, or failure of a generating unit to
start up or increase output. This assistance is provided after the Balancing Authority uses up its
Contingency Reserve Obligation (i.e., 7 percent ofload served by thermal resources; 5 percent of
load served by hydro reserves). The reserve sharing program provides a benefit to the utility by
coverig the first hour of an outage. For recording LOLH and calculating LOLP, the stochastic
simulation. should omit the first hour of a forced outage event in order to captue reserve sharing
benefits. Implementing this fuctionality in the PaR model requires that a "shadow" station be
assigned to each unit with a capacity equal to the unit MW rating and energy equal to the full
load output. The shadow station is called upon in the event of a unit outage, thereby contrbuting
emergency generation for one hour durg the outage period. (The PaR model would determine
that hour based on the marginal energy cost durg the outage period.)
This modeling approach was judged to be too complex to implement and validate in time for use
in the 2011 IRP. However, this approach was implemented for a loss of load study conducted by
the PaR model vendor, Venty LLC, for Public Service Company of Colorado. The impact to the
PRM of modeling reserve sharing rules of the Rocky Mountain Reserve Group (RMRG) was a
reduction of 1.5 percentage pointS.52 While the RMRG reserve sharing rules provide for up to
two hours of contingency reserve assistace as opposed to the one hour for the Northwest Power
Pool's program, the RMG rules are more restrctive in other respects. For example, reserve
support is targeted for units at least 200 MW in size, is provided only to the unit with the largest
capacity in the event that two or more units experience simultaneous outages,. covers only one
outage event per month, and covers less than the full unit capacity due to a smaller pool of
member reserves available. Given these offsetting limitations, PacifiCorp assumes that a PRM
reduction of 1.5 percentage points is a reasonable proxy for the NWP's reserve sharng benefit.
Figue l10 reports the LOLH counts for the five PRM levels modeled, while Figue J.11 reports
the resulting LOLE index values (the stochastic average for the 100 Monte Carlo iterations).
be synchronized to the system and ready to provide power instantaeously. Non-spining reserve is generating
capacity that is not synchronized to the system but can be available within a few hours - although some capacity
may be ready imediately.
52 The 10ss of load report is available at:
http:/í"'i\'v'W.xceJenergy.comlSiteCoJ JectionDocuments/ docs/CRPReserveMarginS tudy.pdf
252
PACIFICORP - 2011 IRP APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Fitted cures highlight the smooth relationship between the reliability statistics and the PRM
leveL.
Figure J.12 reports the total fixed cost of meeting each PRM level based on the incremental IC
aero SCCT resource capacity required. The per-unit fixed cost is approximately $191/kW-year,
which is grossed up to account for a 2.7 percent expected forced outage rate. Each percentage
point increase in the PRM translates into an incremental fixed cost of about $42 milion.
Figure J.I0 - System LOLH by Planning Reserve Margin Level
2014l0lH
20
5
15
,
I :i
¡ 510..
o
o 5 10 15 20
Reserve Margin (%)
Figure J.lt - System LOLP Index by Planning Reserve Margin Level
Loss of Load Probability
4.0000
3.5000 -------
3.0000
_ 2.5000~;: 2.0000
5 1.5000..
1.0000
0.5000
0.0000
o 5 10 15 20
Reserve Margin (%)
253
P ACIFICORP - 2011 IRP APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.12 - Reliabilty Resource Fixed Costs Associated with Meeting PRM Levels
-$450,000..;.00 $400,0000~
c
'Q $350,000....::
GI $300,000:-..GIVIGIii $250,000bIc'ii..GI $200,000..u
.=..$150,000.2
VI'I0 $100,000u
.~...!$50,000:i
E:iu $0
00 I-I-I-
W 0 ....
*'iv 00 :.
*'*'w
*'
I-vi
in
*'
I-00w*'
Planning Reserve Margin
Traditionally, the long-term reliabilty planning standard has been a one-day in ten year loss of
load criterion: 24 hours I (8760 hours x 10 years) = 0.027 percent. PacifiCorp has thus adopted
this standad for determination of its PRM for IRP portfolio development.53 Using a logarithmic
fuctional form and regressing the PRM levels against the LOLE values, yielded a PRM of 14.8
percent to achieve a one-day in ten year loss ofload (Figue J.13).
53 Reliance on a one-in-ten loss of load criterion is being bolstered at the Federal leveL. The Federal Energy
Regulatory Commission issued a Notice of Proposed Ru1emaking in October 2010 approving a regional resource
adequacy standard for ReliabilityFirstCorporation (RFC) based on a one-in-ten loss ofload criterion. RFC is one of
the nine Nort American Electrc Reliability Corporation's electrcity reliability councils, consisting of the former
Mid-Atlantic Area Council (MAAC), the East Central Area Coordination Agreernent (ECAR), and the Mid-
American Interconnected Network (MA.
254
P ACIFICORP - 2011 IR APPENDIX J - STOCHASTIC Loss OF LOAD STUY
Figure J.13 - Relationship between Reserve Margin and LOLP
20
18
16
c: 14'ii~ 12
Q, 10
t=
s: 8
~ 6
4
2
o
"~
.
v = -1.086In(x) + 10.92
R2 = 0.9821 .
-
,,,,
0.00 0.20 0.40 0.60 0.80
LOLP (%)
1.00 1.20 1.40 1.60
As noted previously, the loss of load study does not incorporate the benefit of the Northwest
Power Pool reserve sharing program. As a result, the 14.8 percent PRM requires a downward
adjustment. Applying the 1.5 percent RMRG reserve sharing impact estimated by Venty for
Public Service Company of Colorado results in an adjusted PRM of 13.3 percent. Rounding to
13 percent yields the PRM that PacifiCorp selected for its 2011 IR portfolio development.
Based on the loss of load study and an out-of-model planning reserve margin adjustment to
reflect reliability benefits from the Northwest Power Pool's reserve sharig program, PacifiCorp
selected a 13% PRM for 2011 IRP portfolio development. PacifiCorp's previous PRM was 12
percent. This study incorporated a one-year snapshot of the transmission topology and loads &
resources situation, targeting 2014 as the representative study year. Since the study focused on
the PRM needed to meet firm load and sales obligations, it did not incorporate the reliability
benefits of accessing off-system generation with non-firm transmission capacity.
PacifiCorp evaluated the reliabilty impact of different resource mixes using LOLP and Energy
Not Served measures as par of its portfolio evaluation process.
255
PACIFICORP - 2011 IRP APPENDIX K - HYDROELECTRIC CAPACITY ACCOUNTING
ApPENDIX K - HYDROELECTRIC CAPACITY
ACCOUNTING
The Utah Commission, in its 2008 IRPacknowledgment order, directed the Company to revisit
its approach for estimating the capacity contrbution of hydroelectrc facilities for load &
resource balance development puroses. Both the Utah Division of Public Utilities and Office of
Consumer Services specifically recommended in their written comments on the 2008 IRP that
the Company continue to investigate the hydro capacity accounting methodology adopted for
regional resource adequacy reporting puroses by the Pacific Northwest Resource Adequacy
Forum, an organization sponsored by the Nortwest Power and Conservation Council
(NWPCC). This accounting methodology extends the one-hour sustained peaking period to the
six highest load hours over three consecutive days of highest demand. The methodology was
originally adopted in 2008, and continues to be investigated and refined.
In this appendix, the Company first describes what hydro facilities are eligible for providing
sustained hydro peaking capability under an 18-hour standard, and then reports its estimates of
the 18-hour sustained hydro capability for the eligible facilities. The Company then discusses the
applicability of this standard to PacifiCorp's hydroelectrc system.
PacifiCorp evaluated its hydro resource portfolio according to the definitions and methodologies
outlined by the curent standards established by the Pacific Northwest Resource Adequacy
Forum. The following PacifiCorp hydroelectrc facilities apply with regard to supporting
sustained capacity for the Nortwest:
Lewis River
. Swift-I
. Swift-2
. Yale
Other hydro facilties owned and operated by PacifiCorp that provide limited peaking
. JC Boyle
. Copco-I
. Copco-2
. Lemolo-I
. Lemolo- 2
. Toketee
. Slide Creek
. Oneida
257
P ACIFICORP - 2011 IR APPENDIX K - HYDROELECTRC CAPACITY ACCOUNTIG
. Cutler
This second group of hydro facilities was determned to be ineligible for providing sustained
peaking capability as defined by the Pacific Nortwest Resource Adequacy Foru. For example,
they lack sufficient storage for sustained peakig and are constrained in their dispatch by
minimal inflow during the peak load period (July), have ramping regulations imposed within the
operating license, restrctive minimum flow regulation and stage change downstream of the
project, irrgation priority, and fisheries/recreation requirements. Only the Lewis River facilities
listed above (Swift-I, Swift-2, and Yale) meet the criteria for providing 18-hour sustained
peaking capabilty without extraordinar actions taken regarding adaptive policy decisions or
waivers by the various governing agencies and priar staeholders of the project output.
Sustained Hydro Peaking Capabilty for Lewis River Facilties
Durng the July peak load period, the Swift and Yale reservoirs are maintained near full pool
elevation in support of recreation. Historical median flow into the Swift reservoir in July is 1245-
cubic feet per second (cfs). The median natual accretion between Swift and Yale reservoirs is
198 cfs. The median natual accretion between Yale and Merwin reservoirs is 198 cfs. Minimum
flow below the re-regulating facility downstream of Swift and Yale, varies durng the month of
July from 2,300 cfs in the fist ten days, 1900 cfs in the second ten days, and 1,500 cfs in the last
ten days of the month. From July 31st to mid October, the minimum flow is 1,200 cfs. In a
median water year, Swift and Yale reservoirs operate in the upper eight feet of the reservoir 100
percent of the time in July. Over a 15-year consecutive period, Swift and Yale reservoirs operate
in the upper eight feet of the reservoir 93 percent of the time in July. In the upper eight feet of the
reservoirs, Swift 1 and 2 and Yale are capable of 344 MW and 134 MW, respectively. The
maximum sustained peak capacity for Swift 1 and 2 combined is 210 MW. At Yale, the
maximum sustained peak capacity is 95 megawatts. The total combined sustained peak capacity
is therefore 304 MW. The difference between the one-hour sustained peaking capacity and 18-
hour sustained peaking capacity is a reduction of 164 MW as indicated in Table
Table K.l - Peaking Capabilty Comparison for Lewis River Hydro Facilties
Swift 1 and 2
Yale
TOTAL
319
150
469
210
95
305
(l09)
(55)
(164)
These estimates were determined assuming the critical event occurs in the first ten days of July
when the minimum stream flow requirement is the highest. Given the median inflows and
assuming the same 18-hour sustained peakig period, the available peak flow for Swift 1 and 2 is
5,000 cfs, whereas the peak flow for Yale is 5,800 cfs. The above stated sustained capacity
pertains to these peak period flows. Under peak operation, reservoir levels remain approximately
constant as normally required to support recreation.
258
PACIFiCORP-20ll IR APPENDIX K - HYDROELECTRIC CAPACITY ACCOUNTING
The Pacific Northwest Resource Adequacy Forum's 18-hour sustained peaking period stadard
is intended as a broad regional capacity planning guideline. The issue is whether it makes sense
to adopt for PacifiCorp based on its hydro licensing provisions and operational protocols and
practices. In practice, the Company would not adhere to reservoir level compliance or constat
stream flow regulation below Merwin if there was an emergency need for generation to support
critical load. In a real world situation, PacifiCorp would generate to maximum capacity of the
units and make the necessary public announcements unless instrcted to provide the sustained
capacity per a revised peaking period definition enforced by. the Western Electric Coordinating
Councilor Northwest Power Pool.
The Company has the ability to operate outside the normal boundaries of the operating license
given emergency conditions, which means that the 18-hour sustained peaking stadard would hot
be relevant for peak capacity planning as it relates to PacifiCorp's hydro system. Additionally,
the choice of the length of the sustained peaking period has minimal consequences for capacity
position reporting given that the sustained peaking period must be consistently applied to both
hydro capacity and peak loads.
It is also importnt to note that the NWPC characterizes the Resource Adequacy Forum's
capacity adequacy stadard as being useful for informing hydro utilities' resource planning
efforts, and not as a methodology that should be adopted in lieu of the utilties' own planning
criteria and methodologies.
259
PACIFiCORP..2011 IRP APPENIX L - PLANT WATER CONSUMTION
ApPENDIX L - PLANT WATER CONSUMPTION
The information provide in this appendix is for PacifiCorp owned plants. Total water
consumption and generation includes all owners for jointly-owned facilities
261
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26
2
P ACIFICORP - 2011 IR APPENDIX L - PLAN WATER CONSUMTION
Table L.2 - Plant Water Consumption by State
Hunter
Huntin ton
Carbon
Curant Creek
Lakeside
Gadsb
19,157
11,737
2,380
116
19,380
11,385
2,199
82
1,821
426
19,300
10,922
2,349
108
1,287
680
Percent of total water consumption = 43.7%
2008
10,992
27,322
446
7746
2009
10,846
25,361
365
6,983
Percent of total water consumption = 56.3%
Table L.3 - Plant Water Consumption by Fuel Type
Hunter 19,157 19,380 19,300 1320 14.6
HuntIn on 11,737 11,385 10,922 895 12.7
Carbon 2,380 2,199 2,349 175 13.2
Nau hton 9,948 10,992 10,846 700 15.1
Jim Brid er 25,616 27,322 25,361 2120 12.3
W odak 405 446 365 335 1.2
Dave Johnston 7,872 7746 6983 762 9.9
Percent of total water consumption = 97.8%
263
Ei
II .
P ACIFICORP - 2011 IR APPENIX L - PLAN WATER CONSUMION
Percent of total water consumption = 2.2%
Table LA - Plant Water Consumption for Plants Located in the Upper Colorado River
Basin
19,157
11,737
2,380
9,948
25,616
19,380
11,385
2,199
10,992
27,322
19,300
10,922
2,349
10,846
25,361
Percent of total water consumption = 87.8%
264