20210222Quarterly Report.pdf

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VIA ELECTRONIC MAIL
February 22,2021
Jan Noriyuki, Secretary
ldaho Public Utilities Commission
11331 W. Chinden Blvd., Bldg 8,
Suite 201-A(83714)
PO Box 83720
Boise, ldaho 83720-0074
Re Case No. IPC-E-16-19
Defenal and Recovery of Costs Associated with Participation in Energy
lmbalance Market - California lndependent System Operator ('CAISO")
Quarterly Energy lmbalance Market ("ElM') Benefits Assessment Report
Dear Ms. Noriyuki:
Pursuant to Order No. 33706 issued in Case No. IPC-E-16-19, Idaho Power
Company ("ldaho Powe/' or "Company') hereby submits the quarterly CAISO Western
EIM Benefits Report ("Report") for the fourth quarter of 2020. The Report presents
CAISO's quantification of benefits associated with participation in the Western ElM. For
the fourth quarter of 2020, CAISO estimated Western EIM gross benefits of $6.56 million
for ldaho Power.
The EIM has provided financia! benefits to the Company, and ultimately its
customers. However, as discussed in ldaho Power's prior quarterly compliance filings as
well as the Company's May 24,2019, Report of EIM Benefits and Costs of Participation,
CAISO's calculation of benefits for ldaho Power is overstated due to severa! of the
modeling assumptions used in its benefit calculation. The Company developed a more
precise methodology, that uses inputs specificto ldaho Power, fordetermining actual EIM
benefits, the details of which are discussed in the Company's May 24,2019, Report of
EIM Benefits and Costs of Participation.
lf you have any questions regarding this report, please contact Regulatory Analyst
Nicole Blackwell at [phone] or [e-mail].
JULIA A. HILTON
Deputy General Counsel
[e-mail]
JAH:slb
Enclosure
Sincerely,
rj-i:,*){t*
Julia A. Hilton
e Cdifornio ISO
WESTERN EIM BENEFITS REPORT
Fourth Quarter 2020 r r r
Prepared by: Market Analysis and Forecasting
January 29,2421
6 rr,
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WESTERN ElM BENEFITS REPORT FOURTH QUARTER 2O2O
CONTENTS
EXECUTIVE SUMMARY 3
4
4
5
5
BACKGROUND..........
WESTERN ElM ECONOMIC BENEFITS IN Q4 2020..........
CUMULATIVE EIM BENEFITS SINCE INCEPTION
INTER-REGIONAL TRANSFERS .......
WHEEL THROUGH TRANSFERS 12
REDUCED RENEWABLE CURTAILMENT AND GHG REDUCTIONS............
FLEXIBLE RA,M PI NG PROCUREM ENT DIVERSITY SAVI NGS..
....................1 8
....................1 I
.....23
.....24APPENDIX 1 : GLOSSARY OF ABBREVIATIONS.........
MPP/MA&F Copyright 2021 California ISO PaEe 2 ot 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
EXECUTIVE SUMMARY Pm
Morlet Operotor
Colilornio ISO
EIM entity
t Active porticiponl
! Plonned EIM enrry 2021
ffi Plonned EIM enrry 2022
Seottle
Ciry Lighr
Tocomo
Power
Gross benefits from EIM since November 2014 Portlonduenerol
El<trlc
ldoho
Pourcr
f prbl,. s",u,."Compony o[
. New Mexico
a
footprint with more diverse resources and geography
Q4 BENEFITS
Q42020 Gross Benefits by Participant
Arizona Public Service
BANC
California ISO
ldaho Power
NV Energy
PacifiCorp
Portland General Electric
Puget Sound Energy
Powerex
Seattle City Light
Salt River Project
Total
lmillions $)
$8.70
$5.42
$7.54
$6.56
$5.72
$10.90
$6.73
$3.73
$0.91
$2.14
$10.51
$68.86
ECONOMICAL
Gross benefits realized due to more
efficient inter-and intra-regional
dispatch in the Fifteen-Minute
Market (FMM) and Real-Time
Dispatch (RTD[
ENVIRONMENTAL
Metric tons of COz** avoided
curtailments
.ElM Quarterly Benefit Report Methodology:
iril'-.:,.;",..,r,',t:,L.tlrcitti,.:t:ttt/L,i.,r.irtrtettlsrt:jfi'iL-lrtr:litir,l(rlir!,i1,)ii,..l,i,Ji OPERATIONAL
..The GHG emission reduction reported is associated with the avoided curtailment
only" The current market process and counterfactual methodology cannot differentiate
the GHG emissions resulting from serving ISO load via the EIM versus dispatch that
would have occurred external to the ISO without the ElM. For more details, see
lt.iit !,,"r. Lilrrrr.-L_i,r_r_!,9Cqri15rlt: (rrcCrli,{-,rlSi]!(l.L iti ,,:.i.;tr:, I t.ri I tuirfrei,,rtl.
I i i:(]r rr {ri, ! ;1r iii(l(l!eSti({rs, pdl
Average reduction in flexibility
reserves across the footprint
MPP/MA&F Copyright 2021 California l5O PageS of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
. BACKGROUND
The Western EIM began financially binding operation on November 1,2014 by optimizing
resources across the ISO and PacifiCorp Balancing Authority Areas (BAAs). NV Energy began
participating in December 2015, Arizona Public Service and Puget Sound Energy began
participating in October 2016, and Portland General Electric began participating in October
2017.ldaho Power and Powerex began participating in April 2018, and the Balancing Authority
of Northern California (BANC)1 began participating in April 2019. Most recently, Seattle City
Light (SCL) and Salt River Project (SRP) began participating in April 2020.The EIM footprint
now includes portions of Arizona, California, ldaho, Nevada, Oregon, Utah, Washington,
Wyoming, and extends to the border with Canada.
The ISO began publishing quarterly EIM benefit reports in April 20152.
I WESTERN EIM ECONOMIC BENEFITS IN Q4 2O2O
Table 1 shows the estimated EIM gross benefits by each region per month3. The monthly
savings presented show $29.78 million for October, $22.50 million for November, and $16.58
million for December with a total estimated benefit of $68.86 million for the quarter.
Region October November December Total
APS
BANC
c/so
tPco
NVE
PAC
PGE
PSE
PWRX
scL
SRP
Total
TABLE 1: Q4 2020 benefits in millions USD
' The benefits reflect the Sacramento Municipal Utility District as the participating resource within BANC.
2 Prior reports are available at https://www.westerneim.com/Paqes/AbouVQuarterlvBenefits.aspx
3 The EIM benefits reported here are calculated based on available data. lntervals without complete data
are excluded in the calculation. The intervals excluded due to unavailable data are normally within a few
percent of the total intervals.
MPP/MA&F Copyright 2021 California ISO PaEe 4 of 24
$4.22 $2.64 $1.84 $8.70
$2.00 $2.10 $1.32 $5.42
$2.41 $3.79 $1.34 $7.54
$2.39 $2.03 $2.14 $6.56
$3.73 $1.60 $0.3e $5.72
$4.26 $3.40 $e.zq $10.90
$2.94 $1.e4 $1.85 $6.20
$1.34 $1.24 $1.15 $3.73
$0.16 $0.24 $0.51 $0.91
$0.79 $0.73 $0.62 $2.14
$5.54 $2.79 $2.18 $10.51
$29.78 $22.50 $16.58 $68.86
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
I CUMULATIVE EIM BENEFITS SINCE INCEPTION
Since the start of the EIM in November 2014, the cumulative economic benefits have totaled
$1.18 billion. The quarterly benefits have grown over time as a result of the participation of new
Balancing Authority Areas (BAA) in the market, which results in additional benefits for both the
individual BAAs but also compounds the benefits to adjacent BAAs by enabling further
transfers. Graph 1 illustrates the gross economic benefits of the EIM by quarter for each
participating BAA.
$0
rCISO TPAC NNEVP IPSEI 'AZPS TPGE TIPCO TPVI/RX IBANC TSCL TSRP
GRAPH 1: Gross economic benefits for each quarter by BAA
I INTER.REGIONALTRANSFERS
A significant contributor to EIM benefits is transfers across balancing areas, providing access to
lower cost supply, while factoring in the cost of compliance with greenhouse gas (GHG)
emissions regulations when energy is transfened into the lSO. As such, the transfer volumes
are a good indicator of a portion of the benefits attributed to the ElM. Transfers can take place in
both the 1S-Minute Market and Real-Time Dispatch (RTD).
Generally, transfer limits are based on transmission and interchange rights that participating
balancing authority areas make available to the ElM, with the exception of the PacifiCorp West
(PACW) -lSO transfer limit and the Portland General Electric (PGE) -lSO transfer limit in RTD.
These RTD transfer capacities between PACW/PGE and the ISO are determined based on the
allocated dynamic transfer capability driven by system operating conditions. This report does
not quantify a BAA's opportunity cost that the utility considered when using its transfer rights for
the ElM.
Table 2 provides the 1S-minute and S-minute EIM transfer volumes with base schedule
transfers excluded. The EIM entities submit inter-BAA transfers in their base schedules. The
benefits quantified in this report are only attributable to the transfers that occuned through the
MPP/MA&F Copyright 2021 California ISO Page 5 of 24
$140
$120
6 $100te
=
$Bo
g
g $50ooog $40
0
$20
Ql 02 Q3 A4 Q1 Q2 03 Q4 01 02 03 04 01 Q2 Q3 04 01 A2 03 04 01 Q2 Q3 04
r
Q4
?o14 20162015 202020192018m1'7
WESTERN ElM BENEFITS REPORT FOURTH QUARTER 2O2O
ElM. The benefits do not include any transfers attributed to transfers submitted in the base
schedules that are scheduled prior to the start of the ElM.
The transfer from BAA_x to BAA3 and the transfer from BAAJ to BAA_x are separately
reported. For example, if there is a 100 Megawatt-Hour (MWh) transfer during a S-minute
interval, in addition to a base transfer from ISO to NVE, it will be reported as 100 MWh
from_BAA ISO to_BAA NEVP, and 0 MWh from_BAA NEVP to_BAA ISO in the opposite
direction. The 1S-minute transfer volume is the result of optimization in the 1S-minute market
using all bids and base schedules submitted into the ElM. The S-minute transfer volume is the
result of optimization using all bids and base schedules submitted into ElM, based on unit
commitments determined in the 1S-minute market optimization. The maximum transfer
capacities between EIM entities are shown in Graph 2 below.
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
AZPS clso 168,332 148,958
AZPS NEVP 9,820 7,667
AZPS PACE 28,712 27,426
AZPS SRP 39,242 36,802
BANC ctso 29,932 18,715
CISO AZPS 9,220 13,070
ctso BANC 80,425 96,438
crso NEVP 11,030 7,784
crso PACW 428 7,658
crso PGE 2,947 12,556
crso PWRX 18,020 34,027
crso SRP 53,386 65,826
IPCO NEVP 75,571 52,666
IPCO PACE 10,122 8,523
rPco PACW 68,454 76,450
rPco PSEI 13,046 9,811
tPco SCL 6,433 5,915
NEVP AZPS 13,935 13,538
NEVP crso 247,959 85,367
MPP/MA&F
October
Copyright 2021 California ISO Page 6 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
October
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
NEVP PACE 4,886 4,796
PACE AZPS 87,413 79,407
PACE tPco 78,712
PACE NEVP 133,700 113,512
PACE PACW 24,586 28,856
PACE SRP 0 0
PACW crso 20,226 71,163
PACW tPco 29,901 15,139
PACW PGE 61,211 59,163
PACW PSEI 31,556 20,937
PACW SCL 2,068 1,395
PGE crso 15,976 10,891
PGE PACW 27,O02 34,295
PGE PSEI 1,696 1,018
PGE scL 9,747 8,124
PSEI tPco 0 0
PSEI PACW 25,956 35,202
PSEI PGE 4,108 4,961
PSEI PWRX 44,046 45,273
PSEI SCL 5,449 6,458
PWRX ctso 5,825 0
PWRX PSEI 11 852 15,422
SCL tPco 7,870 7,203
SCL PACW 2,782 4,034
SCL PGE 3,271 3,858
SCL PSEI 21,666 21,728
SRP AZPS 39,688 38,102
MPP/MA&F Copyright 202L California ISO ?a$e7 ol 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
November
4,569
54,272
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
5min EIM transfer
(5m - base)
October
SRP crso 163,634 159,393
SRP PACE 0 0
AZPS ctso 158,259 100,240
AZPS NEVP 3,643 7,089
AZPS PACE 47,575 61,239
AZPS SRP 18,052 13,893
BANC crso 15,150 7,852
ctso AZPS 66,025 81,412
ClSO BANC 101,828 120,790
ctso NEVP 80,359 108,659
crso PACW 1,212 24,362
crso PGE 9,724 23,107
ctso PWRX 5,489 9,292
crso SRP 57,592 63,623
lPco NEVP 84,329 46,557
IPCO PACE 26,499 25,763
lPco PACW 37,111 45,517
IPCO PSEI 672 1,023
rPco SCL 3,344
NEVP AZPS 11,61 4 5,655
NEVP clso 142,705 81,708
NEVP tPco 24,953 27,665
NEVP PACE 35,707
PACE AZPS 125,083 89,299
PACE lPco 32,015 36,995
PACE NEVP 79,769 54,681
PACE PACW 8,259 12,263
MPP/MA&F Copyright 2021 California ISO Page 8 of 24
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
5min EIM transfer
(5m - base)
November
PACE SRP 0 0
PACW crso 19,387 52,849
PACW rPco 48,5',11 31,783
PACW PGE 55,679 62 325
PACW PSEI 17,223 '18,039
PACW SCL 1,412 1,210
PGE ctso 9,367
PGE PACW 27,468 28,338
PGE PSEI 1,055 1,349
PGE SCL 2,430 2,151
PSEI IPCO 0 0
PSEI PACW 50,963 55,951
PSEI PGE 5,992 6,526
PSEI PWRX 28,714 31,561
PSEI SCL 't6,689 15,383
PWRX CISO 10,455 0
PWRX PSEI 20,104 21,603
SCL IPCO 13,694 11,009
SCL PACW 7,020 8,132
SCL PGE 3,462 3,845
SCL PSEI 12,437 '13,811
SRP AZPS 8,139 16,586
SRP ctso 109,179 96,097
SRP PACE 0 0
AZPS crso 112,088 75,488
AZPS NEVP 3,714 5,995
AZPS PAEE 26,146 42,092
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
MPP/MA&F
December
Copyright 2021 California ISO Page 9 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
December
0
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
AZPS SRP 18,259 14,938
BANC ctso 9,808 5,082
crso AZPS 43,349 58,925
ctso BANC 78,369 87,407
clso NEVP 61,284 87,223
ctso PACW 6,336 22,159
ctso PGE 4,956 17J20
ctso PWRX 4,436 7,650
crso SRP 32,764 35,364
tPco NEVP 92,320 69,182
IPCO PACE 18,422 19,567
IPCO PACW 41,455 43,284
rPco PSEI 0 0
rPco SCL 4,836 5,235
3,975NEVPAZPS5,226
NEVP crso 138,938 91,807
NEVP tPco 19,879 19,961
NEVP PACE 22,032 32,348
PACE AZPS 129,450 107,902
PACE tPco 18,927 20,011
67,692PACENEVP83,600
PACE PACW 12,926 13,360
PACE SRP 0
PACW crso 39,132 43,663
PACW rPco 46,573 36,213
PACW PGE 38,422 39,498
PACW PSEI 14,002 15,053
MPP/MA&F Copyright 2021 California ISO Page 10 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
TABLE 2: Energy transfers (MWh) in the FMM and RTD markets for Q4 2020
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
5min EIM transfer
(5m - base)
December
PACW scL 1,226 1,181
PGE crso 28,138 639
PGE PACW 42,675 48,129
PGE PSEI 5,081 5,941
PGE SCL 2,846 2,598
PSEI IPCO 0 0
PSEI PACW 49,864 57,705
PSEI PGE 13,813 16,425
PSEl PWRX 16,824 15,814
PSEI SCL 20,944 24,423
PWRX crso 12,418 7
PWRX PSEI 41,409 52,430
SCL rPco 11,498 10,508
SCL PACW 5,535 6,928
SCL PGE 2,814 3,375
SCL PSEI 6,450 6,048
SRP AZPS 23,923 38,541
SRP CISO 147,514 124,690
SRP PACE 0 0
MPP/MA&F Copyright 2021 California ISO Page 7! of 24
WESTERN ElM BENEFITS REPORT FOURTH QUARTER 2O2O
Fdr Etlr*dflc
UYn,
Foh 24 faodbnsrl 3590
Eldorodo
Foh 35 fwa lb 5BO
ta
gACWh FGT 320
Fofi 66 flSObgGB 627
Poh 66|FGEoSq 296
Fotr 66 [5O b PAC]U 33t
Pdrli Ffi 66 pACwfuSO,132
Foh t7 G400r r
PSE I'o PACW 300
Foar 78 IPACE b APS,625
Pdt 78 fAPS b 660
522
,r,laod 230 IAff +> ffiJ 236f'b
b
bbr*?L BACwh FCO Fdr7sl {00510
HACE b IFCO 2,557
ra IPCObPACE t.550
-ffi
diruoim e bidirrctio.El
fi, Cd*trnio S.O
I no.ris"gI xvtrogr/
! *ito,a iuilic SrYir
! f*"naC-od Eodrk
I n€.r So*nd tragy
I *uroro canpirrr
I I,{DYVP tg.ltrffitt
! fuHk Scrtc Compony ol Na* lrtceico
lc;cy7oi21l
! A{or*'fV"$"nr Er*rgy fary AC?1,;
! Turlor* lrQaion Dirbid hrry r0?tl
!l"i*o bl}:fffitt
! Tucron Elctxk Pq*ct ln1r ?ffnt
f laomo ?o*c llr*yfr?,1
(ft Eonrt'rilh Fm Adminiamfion
,r.4fr]21
! LcA lr*rgy . Color€do I*:.rI ?022J
II naru
BAt{( &*u?rrtif ?trI,
s.dd. Cirr tbtrtI sot riw rftixr
t{vT blFCo W
IPCO to t{Vf 300478
Pswerex {-> PSf 150
Pouerex <-> lS0 l5O
! + *raJs$ qa*ll b }taEffdlv t/ E*o 6J t-rF.di. ".4- Jxcsolrm- aJ Fd z, 6+611
I wha n q irmlJ6cFydrltHcoficosaEl d
nnt' rJ ril A.'a+r+,*ldJCy *. a.J # r Fd I 4sJaJJL-*J.
Cacofj{&O
GRAPH 2: Estimated maximum transfer capacity (ElM entities operating in Q4 2020)
I WHEEL THROUGH TRANSFERS
As the footprint of the Western EIM grows, wheel-through transfers may become more common.
Currently, an EIM entity facilitating a wheelthrough receives no direct financial benefit for
facilitating the wheel; only the sink and source directly benefit. As part of the Western EIM
Consolidated lnitiatives stakeholder process, the ISO committed to monitoring the wheel
through volumes to assess whether, after the addition of new EIM entities, there is a potential
future need to pursue a market solution to address the equitable sharing of wheeling benefits.
The ISO will continue to track the volume of wheel-through transfers in the EIM maket in the
quarterly reports. ln order to derive the wheelthrough transfers for each EIM BAA, the ISO uses
the following calculation for every real-time interval dispatch:
MPP/MA&F Copyright 2021 California ISO Page 72 ot 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
a Total import: summation of transfers above base transfers coming into the EIM BAA
under analysis
Total export: summation of alltransfers above base transfers going out of the EIM
BAA under analysis
Net import: the maximum of zero or the difference between total imports and total
exports
Net export: the maximum of zero or the difference between total exports and total
imports
Wheelthrough: the minimum of the EIM transfers into (total import) or EIM transfer
out (total export) of a BAA for a given interval
a
a
a
a
Allwheelthrough transfers are summed over both the month and the quarter. This volume
reflects the tota! wheel-through transfers for each EIM BAA, regardless of the potential paths
used to wheelthrough. The net imports and exports estimated in this section reflect the overall
volume of net imports and exports; in contrast, the imports and exports provided in Table 2
reflect the gross transfers between two EIM BAAs.
The metric is measured as energy in MWh for each month and the corresponding calendar
quarter, as shown in Tables 3 through 6 and Graphs 3 through 6.
MPP/MA&F Copyright 2021 California ISO Page 13 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
BAA Net Export Net lmport WheelThrough
AZPS
BANC
c/so
tPco
NEVP
PACE
PACW
PGE
PSE/
PWRX
scL
SRP
TABLE 3: Estimated wheel-through transfers in Q4 2020
53
=
E"oc
UJ
1,800,000
1,600,m0
1,400,000
1,200,000
1,000,000
800,000
600,000
400,000
200,000
0
SRP
I
AZPS
I I
BANC CISO IPCO NEVP
rNet Export
PACE PACW PGE
ENet lmport
PSEI P\,RX SCL
r\Mreel Through
GRAPH 3: Estimated wheel-through transfers in Q4 2020
31,843 305,031
172,343 65,485 242,591
656,033 232,266 44,737
118,042 227,612 25,787
80,960 134,960 8,671
473,285 230,570 550
MPP/MA&F Copyright 2021 California ISO Page L4 ot 24
18,715 96,592
54,583 15,116 99,092
280,543 20,459 20,zffi
69,132 ,48211421843
4,25011,214 75,144
197,438 102,548 135
WESTERN ElM BENEFITS REPORT FOURTH QUARTERzOM
BAA Net Export Net lmport Wheel-Through
AZPS
BANC
crso
tPco
NEVP
PACE
PACW
PGE
PSE/
PWRX
sct
SRP
TABLE 4: Estimated wheel-through transfers in October 202O
700,000
800,m0
500,000
s3
=
400,0m
EDocut
300,0m
200,000
100,m0 I I ll III I0 I
SCLAZPS BANC CISO IPCO NEVP PrcE PACW PGE PSEI P1,VRX
I Net Export r Net lmport lVt/heel Through
SRP
GRAPH 4: Estimated wheel-through transfers in October 2020
MPP/MA&F copyright 2021 callfornir lso Page 15 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
BAA Net Export Net lmport Wheel- Through
AZPS
BANC
c/so
lPco
NEVP
PACE
PACW
PGE
PSE'
PWRX
SCL
SRP
TABLE 5: Estimated wheel-through transfers in November 2020
,c
==
EDoc,
T.lJ
700,000
600,000
500,000
400,000
300,000
200,000
100,000
0 I
AZPS
t I !ry
BANC CISO IPCO NEVP
r Net Export
PACE PACW PGE PSEI PV1IRX
rNet lmport rWheel Through
SCL SRP
GRAPH 5: Estimated wheel-through transfers in November 2020
8,046 120,911
46,029 29,234 77,783
177,864 128,832 12,879
28,277 92,353 3,873
20,316 39,356 1,383
112,875 77,939 106
MPP/MA&F Copyright 2021 California ISO Page 16 of 24
5,082 87,529
21,135 65,71671,731
82,974 11,571197,627
10,43246,922 66 127,
49,430 20,459 3,039
50,083 309162,972
WESTERN EIM BENEFITS REPORT FOURTH QUARTER2O2O
BAA Net Export Net lmport WheelThrough
AZPS
BANC
crso
tPco
NEVP
PACE
PACW
PGE
PSE'
PWRX
scr
SRP
TABLE 0: Estimated wheel-through transfens in December 2020
33
=
Eocut
700,000
600,0m
500,0m
400,000
300,000
200,000
100,000 tltrr0II I I
scL
I
SRPAZPS BANC CISO IPCO
r Net Export
NEVP PACE
rNet lmport
PACW PGE PSEI PWRX
I\ rheel Through
GRAPH 6: Estimated wheel-through transferc ln Decembsr 2020
MPP/MA&F Copyrlght 2021 California l5O PagetT cf-24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
I REDUCED RENEWABLE CURTAILMENT AND GHG REDUCTIONS
The Western EIM benefit calculation includes the economic benefits that can be attributed to
avoided renewable curtailment within the ISO footprint. lf not for energy transfers facilitated by
the ElM, some renewable generation located within the ISO would have been curtailed via
either economic or exceptional dispatch. The total avoided renewable curtailment volume in
MWh for Q4 2020 was calculated to be 4,678 MWh (October) + 20,908 MWh (November) +
14,370 MWh (December) = 39,956 MWh total.
There are environmental benefits of avoided renewable curtailment as well. Under the
assumption that avoided renewable curtailments displace production from other resources at a
default emission rate of 0.428 metric tons COzlMWh, avoided curtailments displaced an
estimated 17,101 metric tons of COz for Q4 2020. Avoided renewable curtailments also may
have contributed to an increased volume of renewable credits that would otherwise have been
unavailable. This report does not quantify the additional value in dollars associated with this
benefit. Total estimated reductions in the curtailment of renewable energy along with the
associated reductions in COz are shown in Table 7.
Year Quarter MWh Eq. Tons COz
2015
2016
2017
2018
2 132,937
1 8,860 3,792
2 3,629 1 553
3 828 354
4 17,765 7,521
1 112,948 48,342
2 158,806 67,969
3 33,094 14,164
4 23,390 10,011
1 52,651 22,535
2 67,055 28,700
3 23,331 9,986
4 18,060 7 730t
1 65,860 28,188
2 129,128 55,267
3 19,032 8,146
4 23,425 10,026
1 52,254 22,365
MPP/MA&F
2019
Copyright 2021 California ISO
56,897
Page 18 of 24
3 33,843 14,485
4 35,254 15,089
1 86,740 37,125
2 147,514 63,136
16,071337,548
4 39,956 1 7 1 01
Total 1,323,908 586,553
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
Year Quarter MWh Eq. Tons COz
2019
2020
TABLE 7: Total reduction in curtailment of renewable energy and associated reductions in GOz
I FLEXIBLE RAMPING PROGUREMENT DIVERSITY SAVINGS
The Western EIM facilitates procurement of flexible ramping capacity in the FMM to address
variability that may occur in the RTD. Because variability across different BAAs may happen in
opposite directions, the flexible ramping requirement for the entire EIM footprint can be less
than the sum of individual BAA's requirements. This difference is known as flexible ramping
procurement diversity savings. Starting in 2016, the ISO replaced the flexible ramping constraint
with flexible ramping products that provide both upward and downward ramping. The minimum
and maximum flexible ramping requirements for each BAA and for each direction are listed in
Table 8.
Month BAA Direction Minimum
requirement
Maximum
requirement
AZPS up 31 289
BANC up 6 80
c/so up 369 1776
tPco up 20 217
NEVP up 29 280
PACE up 77 311
PACW up 48 171
PGE up 50 215
PSE/up 25 157
PWRX up 56 216
sct up 4 40
SRP up 2 151
October
MPP/MA&F Copyright 2021 California ISO Page 19 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
November
Month BAA Direction Minimum
requirement
Maximum
requirement
October
ALL EIM up 484 2,080
AZPS down 21 272
BANC down 6 101
c/so down 130 1,295
tPco down 47 224
NEVP down 256
PACE down 7',\345
148PACWdown35
PGE down 27 216
PSE/down 35 167
PWRX down 77 242
sct down 2
SRP down 18 132
ALL EIM down 189 1,761
AZPS up 0 259
BANC up 0 54
c/so up 0 1,776
tPco up 0 217
NEVP up 0
up 0
280
PACE 318
PACW up 0 1 71
PGE up 0 21s
PSE/up 0 157
PWRX up 0 250
scr up 0 40
SRP up 0 1 5 1
ALL EIM up 0 2,080
AZPS down 0 272
BANC down 0 76
MPP/MA&F Copyright 202L California ISO Page 20 of 24
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
Month BAA Direction Minimum
requirement
Maximum
requirement
November
c/so down 0 1,295
tPco down 0 21 1
NEVP down 0 315
PACE down 0 345
PACW down 0 148
PGE down 206
PSE/down 0 190
PWRX down 246
sct down 0 42
SRP down 0 132
ALL EIM down 0 1 851
AZPS up 83 276
BANC up 6 59
c,so up 280 2,392
tPco up 25 219
NEVP up 24 261
PACE up 85 328
PACW up
up
62 181
PGE 46 263
PSE'up 44 196
PWRX up 56 253
52scrup4
SRP up 33 180
ALL EIM up
down
407 2,666
AZPS 12 243
BANC down 3 70
c/so down 147 1,303
tPco down 46 224
NEVP down 20 339
December
MPP/MA&F Copyright 2021 California ISO Pagezl of 24
BAI\Direction Minimum
requirement
Maximum
Requirement
PACE down 112 391
PACW down 17325
PGE down 43 206
PSEI down 40 165
PWRX down 64 251
scr down 1 43
SRP down 21814
downALL EIM 216 1,807
WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
Table 8: Flexible ramping requirements
The flexible ramping procurement diversity savings for all the intervals averaged over the month
are shown in Table 9. The percentage savings is the average MW savings divided by the sum of
the four individual BAA requirements.
October November December
Direction
Average MW saving
Sum of BAA requirements
Percentage savlngs
Table 9: Flexible ramping procurement diversity savings in Q4 2020
Flexible ramping capacity may be used in RTD to handle uncertainties in the future interval. The
RTD flexible ramping capacity is prorated to each BAA. Flexible ramping surplus MW is defined
as the awarded flexible ramping capacity in RTD minus its share, and the flexible ramping
surplus cost is defined as the flexible ramping surplus MW multiplied by the flexible ramping
EIM-wide marginal price. A positive flexible ramping surplus MW is the capacity that a BAA
provided to help other BAAs, and a negative flexible ramping surplus MW is the capacity that a
BAA received from other BAAs. The EIM dispatch cost for a BAA with positive flexible ramping
surplus MW is increased because some capacities are used to help other BAAs. The flexible
ramping surplus cost is subtracted from the BAA's EIM dispatch cost to reflect the true dispatch
cost of a BAA. Please see the Benefit Report Methodology for more details.
Up Down Up Down Up Down
831 882 828 872 962 914
2,116 1,699 1,871 1,711 1,947 1,772
39Yo 52%44%51%49Yo 52o/o
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WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
I CONCLUSION
Using state-of-the-art technology to find and deliver low-cost energy to meet real-time demand,
the Western EIM demonstrates that utilities can realize financial and operational benefits
through increased coordination and optimization. ln addition to these benefits, the Western EIM
provides significant environmental benefits through the reduction of renewable curtailments
during periods of oversupply. Sharing resources across a larger geographic area reduces
greenhouse gas emissions by using renewable generation that otherwise would have been
turned off. The quantified environmental benefits from avoided curtailments of renewable
generation from 20't5 to-date reached 566,553 metric tons of COz, roughly the equivalent of
avoiding the emissions from 119,115 passenger cars driven for one year.
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WESTERN EIM BENEFITS REPORT FOURTH QUARTER 2O2O
Appendix 1: Glossary of Abbreviations
Abbreviation Descri
APS Arizona Public Service
BAA Area
BANC of Northern California
cl rso California lSO
EIM E lmbalance Market
FMM Fifteen Minute Market
GHG Greenhouse Gas
IPCO ldaho Power
MW
MWh
NVE NV
PAC
PACE East
PACW West
PGE Portland Genera! Electric
PSE Sound
PWRX Powerex
RTD RealTime
SCL Seattle L
SRP Salt River Project
MPP/MA&F Copyright 2021 California ISO Page}A ol 24