HomeMy WebLinkAbout20190821Avista to Staff 135 Attachment C.pdfLGIP #43 System Impact Study Report
System Impact Study Report
Project #43
October 30, 2015
Richard Maguire
Avista System Planning Engineer
Kevin Damron
Avista System Protection Engineer
Avista Project Account 77705266-186200
Staff_PR_135 Attachment C Page 1 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 2 of 52
Executive Summary
On June 19, 2015, Avista received a completed Interconnection System Impact Study Request
from the Project #43 Developer for a proposed 150 MW wind generating facility located near
Lind, Washington. On July 28, 2015, Avista and the Project #43 Developer completed the
Interconnection System Impact Study Agreement. The Interconnection Customer has given a
projected initial operating date of December 31, 2016. The Interconnection System Impact Study
Agreement states that Avista will study the possible interconnection of Project #43 at Lind
Station.
The goal of this study was to determine interconnection impacts, project requirements, and cost
estimates necessary to integrate Project #43 as a Network Resource and also as an Energy
Resource.1 Power flow, transient stability, and short circuit studies were used to measure the
performance of the existing system and determine the adequacy of new facilities necessary to
maintain proper system performance and reliability with Project #43 operating at full output.
The study work indicates that this interconnection performs adequately and has no adverse
impacts on the Transmission System when the identified network upgrades are completed. The
estimated cost to fully interconnect Project #43 is approximately $22,017,000. This includes the
rebuilding Lind Station and the increase in capacity of local transmission lines. The scheduled
interconnection of Project #43 is dependent on the completion of a Facilities Study, Engineering
and Procurement Agreement, and Interconnection Agreement.
POI Project Output Schedule Total Cost
($000)
Lind Station 150 MW Time to Construct = December 31, 2018 $22,017,000
All construction costs are in 2016-year dollars and are based on engineering judgment with +/-
20% error. These cost estimates assume that the Project #43 owners are responsible for all
necessary facilities from their facility to the POI.
NOTE: Project #43 output could still need to be curtailed in the event of planned or extended
forced outages to some transmission system elements including, but not necessarily limited to,
any transmission line segment between the Lind and Warden 115kV Switching Stations.
1 For this study, Energy Resource performance adequacy is assumed if Network Resource performance is proven
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 3 of 52
TABLE OF CONTENTS
EXECUTIVE SUMMARY ................................................................................................................................... 2
INTRODUCTION ................................................................................................................................................ 4
GENERAL ........................................................................................................................................................... 4
Point of Interconnection (POI) ...................................................................................................................... 5
Scope of the System Impact Study .................................................................................................................. 7
Study Case Description and Development ...................................................................................................... 8
PRELIMINARY POWER FLOW STUDY .................................................................................................................. 13
Current System Capacity ............................................................................................................................. 13
Incremental Generation Analysis ................................................................................................................. 14
Thermal Performance .................................................................................................................................. 18
MITIGATING PROJECT ................................................................................................................................. 20
PROJECT REQUIREMENTS .................................................................................................................................. 21
Point of Interconnection (Lind Station): $7,550,000 ..................................................................................... 21
Transmission Line Requirements: $14,467,000 ............................................................................................ 22
STUDY RESULTS ............................................................................................................................................. 23
INCREMENTAL GENERATION ANALYSIS ............................................................................................................. 23
THERMAL PERFORMANCE ................................................................................................................................. 26
Base Case Impact ........................................................................................................................................ 26
Project #43 at Full Requested Output .......................................................................................................... 28
VOLTAGE PERFORMANCE ................................................................................................................................. 29
Base Case Voltage Performance .................................................................................................................. 29
Voltage Performance with Project #43 ........................................................................................................ 33
Contingency Voltage Performance ............................................................................................................... 36
Impacted Transmission Facilities ................................................................................................................ 38
SHORT CIRCUIT ANALYSIS ................................................................................................................................ 41
General:...................................................................................................................................................... 41
ASPEN Model Development: ....................................................................................................................... 42
Station Transformers ................................................................................................................................... 42
Collector String and Pad Mount GSUs ........................................................................................................ 42
Wind Turbines ............................................................................................................................................. 43
Fault Analysis Study .................................................................................................................................... 43
Fault Duty Comparisons.............................................................................................................................. 43
Summary ..................................................................................................................................................... 45
TRANSIENT STABILITY ...................................................................................................................................... 46
Method and Criteria .................................................................................................................................... 46
Transient Stability Results ........................................................................................................................... 47
CONCLUSION ..................................................................................................................................................... 2
APPENDIX A ....................................................................................................................................................... 3
ASPEN MODEL DEVELOPMENT: ......................................................................................................................... 3
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 4 of 52
Introduction
General
In the application for Large Electric Generator Interconnection, the Project #43 Developer
requested the study for Project #43 be conducted both for network resource interconnection
service and energy resource interconnection service. Avista’s System Planning Group contends
that if a generator is studied and can connect for Network Resource Interconnection Service then
it can also connect for Energy Resource Interconnection Service.
Energy Resource Interconnection Service allows the Interconnection Customer to connect the
Large Generating Facility to the Transmission System and be eligible to deliver the Large
Generating Facility's output using the existing firm or non-firm capacity of the Transmission
System on an "as available" basis. Energy Resource Interconnection Service does not in and of
itself convey any right to deliver electricity to any specific customer or Point of Delivery.
For Network Resource Interconnection Service the Transmission Provider must conduct the
necessary studies and construct the Network Upgrades needed to integrate the Large Generating
Facility in a manner comparable to that in which the Transmission Provider integrates its
generating facilities to serve native load customers. Network Resource Interconnection Service
allows the Interconnection Customer’s Large Generating Facility to be designated as a Network
Resource, up to the Large Generating Facility's full output, on the same basis as existing
Network Resources interconnected to the Transmission Provider's Transmission System, and to
be studied as a Network Resource on the assumption that such a designation will occur.
Network Resource Interconnection Service in and of itself does not convey transmission service.
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 5 of 52
Point of Interconnection (POI)
The System Impact Study Agreement states that Avista will study the interconnection of Project
#43 in the vicinity of Avista’s Lind Station. Figure 1 presents a view of the local 115 kV
Transmission System for the area surrounding the POI, and Figure 2 shows a one-line diagram of
the project in a 2016 Heavy Summer base case scenario.
Figure 1: Project #43 map
Project #43
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 6 of 52
Figure 2: Project #43 installed in 2016 Heavy Summer Base Case
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 7 of 52
Scope of the System Impact Study
As outlined in Section 7.3 of Avista’s Large Generator Interconnection Procedures (LGIP), this
study evaluates the impact of the proposed interconnection on the reliability of the Transmission
System, and it consists of a power flow analysis, stability analysis, and a short circuit analysis.
Of note for the scope of this study:
This study considers all other higher queued interconnection requests that directly impact
the Project #43 interconnection.
The transmission additions simulated in the study cases were based on the best
information available at the time the study was initiated. It is likely that the actual plan of
service will differ from the plan of service studied, and Avista reserves the right to
restudy this request if necessary.
Transmission capacity impacts and upgrades beyond the Transmission Provider’s
Interconnection Facilities identified by this Interconnection System Impact Study Report
are provided for informational purposes only. A complete analysis of these transmission
capacity impacts associated with Project #43 and any facilities needed to mitigate the
impacts would be identified through the study process for Transmission Service, once a
request for Transmission Service has been made.
The resulting Interconnection System Impact Study report includes the following information2:
Identification of facility thermal overloads or facility voltage violations resulting from the
interconnection
Identification of transient stability violations resulting from the interconnection
Identification of any circuit breaker or equipment short circuit capability limits exceeded
as a result of the interconnection.
Description and non-binding, good faith estimated cost of facilities required to
interconnect the project to the Avista Transmission System.
Non-binding, good-faith estimate of time to construct.
Avista System Planning coordinated the Interconnection System Impact study work with
Affected Systems determined during the Interconnection Feasibility Study.
2 Thermal, voltage, and stability performance determined by reference to NERC Standard TPL-001-4
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 8 of 52
Study Case Description and Development
Power flow and stability analysis were performed using Heavy Summer and Heavy Winter
Planning cases for 2016 and 2020 conditions. Avista Planning Cases are tailored from approved
WECC cases, and a standardized set of steady state and stability contingency scenarios are run
against each case for different levels of Project #43 generation. These contingencies include
outages within the Avista Transmission System as well as select outages in adjacent Planning
Coordinator and Transmission Planner areas. Contingencies are added or modified to include
elements added to the Transmission System for the purposes of this study, and contingency
events covering TPL-001-4 categories P0-P3 and P5-P7 are included.
Staff_PR_135 Attachment C Page 8 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 9 of 52
2016 Heavy Summer
This is the typical summer peak study where the balancing area load is heavy and the
transmission system is at its most limiting condition due to high temperatures. A summary of
regional flows is shown below.
Western Montana Hydro 1225.2 MW West of Hatwai (Path 6) 406.6 MW
Noxon Rapids (586MW) 420.0 MW Lolo-Oxbow 230kV 244.2 MW
Cabinet Gorge (271MW) 240.0 MW Dry Creek-Walla Walla 230kV 127.5 MW
Libby (605MW)375.2 MW
Hungry Horse (430MW) 190.0 MW West of Cabinet 1474.8 MW
Montana-Northwest (Path 8) 600.9 MW
Colstrip Total
Colstrip 1 (330MW)330.0 MW Idaho-Northwest (Path 14) -439.6 MW
Colstrip 2 (330MW)330.0 MW Midpoint-Summer Lake (Path 75) -68.6 MW
Colstrip 3 (823MW)787.2 MW Idaho-Montana (Path 18) -254.0 MW
Colstrip 4 (823MW)820.0 MW
South of Boundary 632.2 MW
Rathdrum Thermal (175MW) 0.0 MW North of John Day (Path 73) 4647.4 MW
Lancaster Thermal (270MW) 249.0 MW TOT 4A (Path 37)166.9 MW
Spokane River Hydro 150.3 MW Miles City DC 158.0 MW
Boundary Hydro (1040MW) 635.0 MW
Path C (Path 20)-625.3 MW
Lower Snake/N.F. Clearwater Borah West (Path 17)642.4 MW
Dworshak (458MW)91.7 MW Bridger West (Path 19) 1954.4 MW
Lower Granite (930MW) 554.0 MW Pacific AC Intertie (Path 66) 3957.8 MW
Little Goose (930MW)555.0 MW Pacific DC Intertie (Path 65) 2000.0 MW
Lower Monumental (930MW) 530.5 MW
Northwest Load 24382.5 MW
Coulee Generation Idaho Load 3700.0 MW
Coulee 500 kV 2285.1 MW Montana Load 1939.3 MW
Coulee 230 kV 1840.9 MW Avista Native Load -1682.4 MW
Avista Balancing Area Load 2206.6 MW
Clearwater Load 50.0 MW
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LGIP #43 System Impact Study Report
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2016 Heavy Winter
This is the typical winter peak study where the balancing area load is at its peak. A summary of
regional flows is shown below.
Western Montana Hydro 680.0 MW West of Hatwai (Path 6) 140.1 MW
Noxon Rapids (586MW) 292.0 MW Lolo-Oxbow 230kV 121.8 MW
Cabinet Gorge (271MW) 185.0 MW Dry Creek-Walla Walla 230kV 84.5 MW
Libby (605MW)108.0 MW
Hungry Horse (430MW) 95.0 MW West of Cabinet 1170.7 MW
Montana-Northwest (Path 8) 1031.3 MW
Colstrip Total
Colstrip 1 (330MW)330.0 MW Idaho-Northwest (Path 14) 130.6 MW
Colstrip 2 (330MW)330.0 MW Midpoint-Summer Lake (Path 75) 236.3 MW
Colstrip 3 (823MW)792.3 MW Idaho-Montana (Path 18) -99.9 MW
Colstrip 4 (823MW)805.0 MW
South of Boundary 509.5 MW
Rathdrum Thermal (175MW) 0.0 MW North of John Day (Path 73) 2782.3 MW
Lancaster Thermal (270MW) 273.0 MW TOT 4A (Path 37)119.0 MW
Spokane River Hydro 149.0 MW Miles City DC 154.0 MW
Boundary Hydro (1040MW) 510.0 MW
Path C (Path 20)-326.2 MW
Lower Snake/N.F. Clearwater Borah West (Path 17)818.3 MW
Dworshak (458MW)408.0 MW Bridger West (Path 19) 1924.3 MW
Lower Granite (930MW) 831.5 MW Pacific AC Intertie (Path 66) 1981.9 MW
Little Goose (930MW)832.5 MW Pacific DC Intertie (Path 65) 1763.0 MW
Lower Monumental (930MW) 783.0 MW
Northwest Load 30208.3 MW
Coulee Generation Idaho Load 2704.0 MW
Coulee 500 kV 3788.9 MW Montana Load 1940.0 MW
Coulee 230 kV 1621.3 MW Avista Native Load -1815.4 MW
Avista Balancing Area Load 2415.4 MW
Clearwater Load 55.0 MW
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 11 of 52
2020 Heavy Summer
This is the typical summer peak study where the balancing area load is heavy and the
transmission system is at its most limiting condition due to high temperatures. A summary of
regional flows is shown below.
Western Montana Hydro 1225.2 MW West of Hatwai (Path 6) 582.1 MW
Noxon Rapids (586MW) 420.0 MW Lolo-Oxbow 230kV 230.5 MW
Cabinet Gorge (271MW) 240.0 MW Dry Creek-Walla Walla 230kV 148.6 MW
Libby (605MW)375.2 MW
Hungry Horse (430MW) 190.0 MW West of Cabinet 1461.9 MW
Montana-Northwest (Path 8) 635.9 MW
Colstrip Total
Colstrip 1 (330MW)330.0 MW Idaho-Northwest (Path 14) 36.9 MW
Colstrip 2 (330MW)330.0 MW Midpoint-Summer Lake (Path 75) 338.0 MW
Colstrip 3 (823MW)811.9 MW Idaho-Montana (Path 18) 306.0 MW
Colstrip 4 (823MW)820.0 MW
South of Boundary 632.8 MW
Rathdrum Thermal (175MW) 0.0 MW North of John Day (Path 73) 5129.8 MW
Lancaster Thermal (270MW) 249.0 MW TOT 4A (Path 37)189.7 MW
Spokane River Hydro 150.3 MW Miles City DC 159.0 MW
Boundary Hydro (1040MW) 635.0 MW
Path C (Path 20)-736.3 MW
Lower Snake/N.F. Clearwater Borah West (Path 17)683.9 MW
Dworshak (458MW)316.0 MW Bridger West (Path 19) 1972.8 MW
Lower Granite (930MW) 554.0 MW Pacific AC Intertie (Path 66) 4177.6 MW
Little Goose (930MW)555.0 MW Pacific DC Intertie (Path 65) 2711.0 MW
Lower Monumental (930MW) 533.0 MW
Northwest Load 25950.5 MW
Coulee Generation Idaho Load 4025.9 MW
Coulee 500 kV 3898.3 MW Montana Load 2060.0 MW
Coulee 230 kV 1944.5 MW Avista Native Load -1728.4 MW
Avista Balancing Area Load 2252.9 MW
Clearwater Load 50.0 MW
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 12 of 52
2020 Heavy Winter
This is the typical winter peak study where the balancing area load is at its peak. A summary of
regional flows is shown below.
Western Montana Hydro 680.0 MW West of Hatwai (Path 6) 5.8 MW
Noxon Rapids (586MW) 292.0 MW Lolo-Oxbow 230kV 108.6 MW
Cabinet Gorge (271MW) 185.0 MW Dry Creek-Walla Walla 230kV 85.8 MW
Libby (605MW)108.0 MW
Hungry Horse (430MW) 95.0 MW West of Cabinet 1098.0 MW
Montana-Northwest (Path 8) 987.3 MW
Colstrip Total
Colstrip 1 (330MW)330.0 MW Idaho-Northwest (Path 14) 78.8 MW
Colstrip 2 (330MW)330.0 MW Midpoint-Summer Lake (Path 75) 145.3 MW
Colstrip 3 (823MW)785.0 MW Idaho-Montana (Path 18) -68.7 MW
Colstrip 4 (823MW)805.0 MW
South of Boundary 508.6 MW
Rathdrum Thermal (175MW) 0.0 MW North of John Day (Path 73) 2530.1 MW
Lancaster Thermal (270MW) 273.0 MW TOT 4A (Path 37)191.1 MW
Spokane River Hydro 149.0 MW Miles City DC 154.0 MW
Boundary Hydro (1040MW) 510.0 MW
Path C (Path 20)-464.2 MW
Lower Snake/N.F. Clearwater Borah West (Path 17)813.2 MW
Dworshak (458MW)408.0 MW Bridger West (Path 19) 1975.1 MW
Lower Granite (930MW) 692.5 MW Pacific AC Intertie (Path 66) 942.3 MW
Little Goose (930MW)832.5 MW Pacific DC Intertie (Path 65) 1473.0 MW
Lower Monumental (930MW) 803.5 MW
Northwest Load 32347.9 MW
Coulee Generation Idaho Load 2860.9 MW
Coulee 500 kV 4625.7 MW Montana Load 2030.1 MW
Coulee 230 kV 1894.6 MW Avista Native Load -1865.2 MW
Avista Balancing Area Load 2483.7 MW
Clearwater Load 55.0 MW
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 13 of 52
Preliminary Power Flow Study
Current System Capacity
Interconnecting Project #43 to the existing Transmission System with all lines in service and
increasing its output until the first facility reaches 90% thermal loading (OthelloSS to Warden) is
shown in Figure 3. At this level of generation, the OthelloSS – Warden 115 kV Transmission
Line overloads for 139 unique contingency scenarios in the 2020 Heavy Summer case. Figure 4
shows system response for the worst-case single-element outage: a line-end-open of the Othello
SS – Warden 115 kV line. Interconnecting Project #43 at this level of generation would likely
require station work at Lind and the installation of protection-level communications and a
thermal tripping scheme to mitigate overloads.
Note: This current system capacity analysis is for informational purposes only.
Figure 3: 2020 Heavy Summer scenario with Project #43 generating 60 MW
Figure 4: Worst-case, single-element outage for current system topology in 20HS case
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 14 of 52
Incremental Generation Analysis
The software program Simulator from PowerWorld Corporation includes a tool – Available
Transfer Capability (ATC) – that returns “next most limiting” facility thermal violations for
incrementing levels of Project #43 generation. The ATC tool provides a helpful first-look at how
the System reacts to increasing generation output from Project #43.
Table 1 presents ATC results when using Avista generation to balance the project, giving an
indication of how the System could perform if Project #43 is studied as a Network Resource
Interconnection Service. Table 2 and Table 3 provide ATC results when studying Project #43 as
an Energy Resource Interconnection Service, with the balancing coming from West of the
project via Coulee generation or South of the project via Diablo Canyon generation. Coulee and
Diablo Canyon were chosen solely for their location without any implication of actual service.
Note that the different location of the Point of Receipt (POR) makes almost no difference in
power flows local to the project, implying little difference in outcome if the project is studied as
a Network or Energy Interconnection Service.
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 15 of 52
Table 1: ATC with AVA Generation balancing Project #43; 2016 Heavy Summer Base Case
Proj #43 Limiting Element Limiting CTG % OTDF
15.81 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.53
16.43 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Sand Dunes - Wheeler 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.71
17.42 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Stratford 115 kV (STR-WIL) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.53
19.08 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Columbia - Rocky Ford 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.58
21.19 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Midway - Mattawa - Wanapum 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.47
34.23 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] T-1: Benton 230/115 kV + T-1: White Bluff #1 230/115 kV -22.82
34.23 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + T-1: White Bluff #1 230/115 kV -22.82
60.45 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
60.65 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
62.96 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Summer Falls Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
63.07 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Marengo Wind Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
63.18 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
118.47 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #2 115 kV (OSS-L&R) + T-1: Benton 230/115 kV -22.1
118.47 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)-22.1
129.67 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A254 Warden 115 kV, Larson-Sand Dunes-Warden 67.39
158.63 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
161.11 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 -74.74
161.22 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 74.74
168.68 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 20.29
168.68 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 20.29
171.68 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.93
171.72 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.93
177.98 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 29.92
194.3 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV 20.55
212.78 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 32.94
Staff_PR_135 Attachment C Page 15 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 16 of 52
Table 2: ATC with Grand Coulee Generation balancing Project #43; 2016 Heavy Summer Base Case
Proj #43 Limiting Element Limiting CTG % OTDF
16.28 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.13
16.88 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Sand Dunes - Wheeler 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.31
17.83 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Stratford 115 kV (STR-WIL) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.13
19.47 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Columbia - Rocky Ford 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.17
21.63 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Midway - Mattawa - Wanapum 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.08
35.25 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] T-1: Benton 230/115 kV + T-1: White Bluff #1 230/115 kV -22.21
35.31 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + T-1: White Bluff #1 230/115 kV -22.21
60.44 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
60.65 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
62.95 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Summer Falls Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
63.06 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Marengo Wind Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
63.18 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
121.01 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #2 115 kV (OSS-L&R) + T-1: Benton 230/115 kV -21.62
121.01 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)-21.62
129.86 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A254 Warden 115 kV, Larson-Sand Dunes-Warden 67.39
158.61 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
161.31 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 -74.74
161.41 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 74.74
171.62 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.95
171.66 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.95
172.31 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 19.85
172.31 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 19.85
179.78 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 29.61
198.15 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV 20.14
214.77 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 32.63
233.61 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV -29.61
Staff_PR_135 Attachment C Page 16 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 17 of 52
Table 3: ATC with Diablo Canyon Generation balancing Project #43; 2016 Heavy Summer Base Case
Proj #43 Limiting Element Limiting CTG % OTDF
9.45 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
11.97 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] T-1: Benton 230/115 kV + T-1: White Bluff #1 230/115 kV -23.21
12.44 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + T-1: White Bluff #1 230/115 kV -23.21
18.26 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
21.51 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
21.76 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Marengo Wind Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
21.78 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] G-1: Summer Falls Units 1&2 + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
56.82 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.8
59.4 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Columbia - Rocky Ford 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.84
59.45 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Stratford 115 kV (STR-WIL) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.8
59.61 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Sand Dunes - Wheeler 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)-22.97
64.89 Line OTHELOSS (48309) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Midway - Mattawa - Wanapum 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R) -22.74
116.9 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #2 115 kV (OSS-L&R) + T-1: Benton 230/115 kV -22.4
116.9 Line BENTNAVA (48039) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)-22.4
129.56 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A254 Warden 115 kV, Larson-Sand Dunes-Warden 67.39
158.63 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
160.99 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 -74.74
161.1 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 74.74
166.44 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 20.57
166.44 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 20.57
171.74 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.92
171.78 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.92
176.84 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 30.12
191.87 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV 20.81
211.48 Line OTHELLO (48307) TO OTHELOSS (48309) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 33.15
229.77 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV -30.12
Staff_PR_135 Attachment C Page 17 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 18 of 52
Thermal Performance
This study found interconnecting Project #43 to the existing Transmission System introduced 6,946 thermal facility violations on the
following 115 kV transmission lines or line segments:
Lind – Roxboro 115 kV
Roxboro – Warden 115 kV
Othello Switching Station – Warden 115 kV
Benton AVA(ownership change) – South Othello Tap 115 kV
Othello Switching Station – Othello 115 kV
Given the large number of violations recorded, the complete data set will not be presented in this study. In lieu of the complete data
set, Table 4 presents a sample of the worst performing facility thermal violations found in this study, and Table 5 presents the sum of
all Percent Overloads recorded for each facility overloaded during contingencies.
Table 4: Worst performing violations for facilities overloaded by Project #43
Row Labels Ref Ctg Value Limit % Ref Ctg Value Limit % Ref Ctg Value Limit % Ref Ctg Value Limit %
N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS -
Warden #2 115 kV (OSS-L&R)
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 661.73 669.51 286.16 233.96
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 579.78 593.63 286.16 207.44 568.48 578.55 286.16 202.17
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 227.82 355.88 266.08 133.75 260.56 403.55 266.08 151.66
N-1: Benton - Midway 230 kV + T-1: White Bluff #1 230/115 kV
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 227.82 353.70 266.08 132.93 406.39 740.09 532.17 278.14
N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 661.73 726.41 286.16 253.84 690.53 736.27 400.13 184.01 653.89 719.66 286.16 251.49 696.94 743.22 400.13 185.75
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 579.78 643.34 286.16 224.81 680.14 725.88 400.13 181.41 568.48 633.35 286.16 221.32 686.68 732.94 400.13 183.18
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 260.56 270.32 266.08 101.59
N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV
OTHELLO (48307) -> OTHELOSS (48309) CKT 1 at OTHELLO 78.43 319.30 288.17 110.80
N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV
OTHELLO (48307) -> OTHELOSS (48309) CKT 1 at OTHELLO 78.43 300.87 288.17 104.41
T-1: Benton 230/115 kV + T-1: White Bluff #1 230/115 kV
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 227.82 353.62 266.08 132.90 406.39 740.27 532.17 278.21
16Hs 16Hw 20Hs 20Hw
Staff_PR_135 Attachment C Page 18 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 19 of 52
Table 5: Aggregate sum of percent overloads per facility due to Project #43
Element SumOfPercent
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 372928.20
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 311787.91
SOTHELOT (48393) -> BENTNAVA (48039) CKT 1 at SOTHELOT 41572.96
OTHELLO (48307) -> OTHELOSS (48309) CKT 1 at OTHELLO 431.85
Staff_PR_135 Attachment C Page 19 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 20 of 52
Mitigating Project
Figure 5 presents a one-line diagram showing the facilities for both Avista and the Project #43
developer necessary to interconnect the project and mitigate thermal violations.
Figure 5: One-line diagram of Project #43
Staff_PR_135 Attachment C Page 20 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 21 of 52
Project Requirements
Point of Interconnection (Lind Station): $7,550,000
Engineering, Management, and Review $50,000
Transmission Line routing $400,000
115 kV terminations, routing, DE’s, Structures $500,000
Property, Permitting, Grading, and Fencing $2,200,000
115 kV Double Bus Double Breaker, 6 Breaker Positions $3,000,000
Control Room, Protection/Integration/SCADA/Comms $1,250,000
Metering and Commissioning $150,000
All of these cost estimates are based on engineering judgment with +/- 20% error in 2016 dollars.
It should be noted that property and grading costs can be significantly different than estimated
due to site specifics. Detailed cost figures and direct assigned costs versus network upgrade costs
will be determined during the Interconnection Facility Study process.
Data (RTU) Requirements
Data for the operation of the proposed power plant will be needed from the POI station and the
115 kV/ 34.5 kV station. The following data will need to be acquired through a Remote Terminal
Unit (RTU):
POI Station
o Analogs
Net generation / Interchange MW – real-time
Net generation / Interchange MVAr – real-time
Net generation / Interchange MWh IN – hourly
Net generation / Interchange MWh OUT - hourly
Net generation / Interchange MVarh IN– hourly
Net generation / Interchange MVarh OUT – hourly
Developer 115 kV/34.5 kV Station
o Analogs
Real power flow through each of the 34.5 kV feeder breakers
Reactive power flow through each of the 34.5 kV feeder breakers
Reactive power flow from each of the shunt capacitors if applicable
Station Service MW
Station Service MWH - hourly
Individual A, B & C phase voltage on the 115 kV bus
o Status
All 34.5 kV and 115 kV breakers
All Unit breakers
Line relay alarm
The RTU will need to be dual-ported and independently telemetered to both Transmission
Provider Control Centers. In addition, the interchange of real power MW will need to be
telemetered to both Transmission Provider Control Centers, independent of the data supplied by
the RTU.
Staff_PR_135 Attachment C Page 21 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 22 of 52
These data requirements will be examined in greater detail with the completion of an
Interconnection Facility Study for Project #43.
Transmission Line Requirements: $14,467,000
Lind – Warden 115 kV (21.7 miles) $9,548,000
Othello Switching Station – Warden 115 kV (8.3 miles) $3,652,000
Othello Switching Station – Othello (2.9 miles) $1,267,000
Staff_PR_135 Attachment C Page 22 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 23 of 52
Study Results
Incremental Generation Analysis
Table 6 presents ATC results when using Avista generation to balance the project, Table 7 presents results with Grand Coulee
balancing the project, and Table 8 presents results with Diablo Canyon generation balancing the project.
Table 6: ATC with AVA Generation balancing Project #43; 2016 Heavy Summer Projects Case
Sink Proj #43 MW Limiting Element Limiting CTG % OTDF
AVA 164.01 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
AVA 179.67 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (BENT-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
AVA 191.39 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.93
AVA 191.5 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.93
AVA 191.61 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)42.93
AVA 220.73 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
AVA 220.96 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
AVA 223.69 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV -32.37
AVA 223.83 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
AVA 223.83 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
AVA 223.95 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
AVA 232.67 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV -22.12
AVA 233.89 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV -22.12
AVA 241 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
AVA 241.81 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
AVA 242.82 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
AVA 244.6 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
AVA 244.7 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
AVA 244.88 Transformer WEST (48463) TO WEST (48461) CKT 1 [230.00 - 115.00 kV] SUB: Bell 500, 230 & 115 (BPA)8.47
AVA 244.88 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV -22.45
AVA 248.39 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (OSS-SOT) -100
AVA 250.05 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV -35.51
AVA 260.25 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 135.74
AVA 262.02 Line SANSAN11 (90111) TO SANDPT A (48377) CKT 1 [115.00 - 115.00 kV] N-1: Cabinet - Noxon 230 kV + N-1: Cabinet - Rathdrum 230 kV 37.49
AVA 262.09 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (BENT-SOT) -100
AVA 263.23 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 32.37
AVA 281.97 Line BRONX (48047) TO SANDPT A (48377) CKT 1 [115.00 - 115.00 kV] N-1: Cabinet - Noxon 230 kV + N-1: Cabinet - Rathdrum 230 kV -37.49
AVA 286.45 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 22.12
AVA 286.45 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 22.12
AVA 291.77 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 35.51
AVA 293.44 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden 100
AVA 293.71 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Sand Dunes - Warden #2 115 kV 100
AVA 295.26 Line BRONX (48047) TO ODEN (48293) CKT 1 [115.00 - 115.00 kV] N-1: Cabinet - Noxon 230 kV + N-1: Cabinet - Rathdrum 230 kV 37.49
Staff_PR_135 Attachment C Page 23 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 24 of 52
Table 7: ATC with Grand Coulee Generation balancing Project #43; 2016 Heavy Summer Projects Case
Sink Proj #43 MW Limiting Element Limiting CTG % OTDF
Coulee 163.97 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
Coulee 179.63 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (BENT-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
Coulee 191.32 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.95
Coulee 191.42 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.95
Coulee 191.53 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)42.95
Coulee 220.73 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
Coulee 220.96 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
Coulee 223.81 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Coulee 223.82 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Coulee 223.86 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
Coulee 226.71 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV -32.03
Coulee 236.83 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV -21.64
Coulee 239.81 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV -21.64
Coulee 241.62 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
Coulee 241.66 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
Coulee 241.83 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
Coulee 244.63 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Coulee 244.74 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Coulee 245.93 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV -22
Coulee 245.93 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (OSS-SOT) -100
Coulee 252.23 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV -35.17
Coulee 260.18 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 135.74
Coulee 262.03 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (BENT-SOT) -100
Coulee 265.72 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 32.03
Coulee 292.31 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 21.64
Coulee 292.31 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 21.64
Coulee 293.42 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden 100
Coulee 293.7 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Sand Dunes - Warden #2 115 kV 100
Coulee 294.33 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 35.17
Staff_PR_135 Attachment C Page 24 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 25 of 52
Table 8: ATC with Diablo Canyon Generation balancing Project #43; 2016 Heavy Summer Projects Case
Sink Proj #43 MW Limiting Element Limiting CTG % OTDF
Diablo 164.01 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
Diablo 179.69 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Othello SS 115 kV (BENT-SOT) + N-1: Sand Dunes - Warden #2 115 kV 100
Diablo 191.46 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)42.92
Diablo 191.57 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] BF: A562 Othello SS 115 kV, Othello Switching Station-Warden #2 42.92
Diablo 191.68 Line WARDEN A (48455) TO WARDEN T (46117) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)42.92
Diablo 220.74 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
Diablo 220.97 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
Diablo 222.15 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV -32.59
Diablo 223.83 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Diablo 223.85 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Diablo 223.98 Line LIND (48187) TO ROXBORO (48375) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
Diablo 228.97 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV -22.43
Diablo 229.4 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV -22.43
Diablo 241.26 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT) 100
Diablo 241.66 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV 100
Diablo 241.95 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Shawnee 115 kV (LIN-EWN)100
Diablo 244.72 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lolo 230 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Diablo 244.93 Line ROXBORO (48375) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Hatwai - Lower Granite 500 kV + N-1: Devils Gap - Lind 115 kV (LIN-RIT)100
Diablo 245.83 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (OSS-SOT) -100
Diablo 245.83 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV -22.74
Diablo 248.62 Line LEE&REYN (48308) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV -35.73
Diablo 260.28 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] BF: A308 Warden 115 kV, Othello SS-Warden #2 135.74
Diablo 261.62 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Othello SS - Warden #1 115 kV 32.59
Diablo 262.13 Line SANDUNES (46087) TO WARDEN A (48455) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Benton - Othello SS 115 kV (BENT-SOT) -100
Diablo 282.82 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #1 115 kV 22.43
Diablo 282.82 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + T-1: Benton 230/115 kV 22.43
Diablo 290.09 Line LEE&REYN (48308) TO OTHELLO (48307) CKT 1 [115.00 - 115.00 kV] N-1: Othello SS - Warden #1 115 kV + N-1: Sand Dunes - Warden #2 115 kV 35.73
Diablo 293.45 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden 100
Diablo 293.72 Line OTHELOSS (48309) TO SOTHELOT (48393) CKT 1 [115.00 - 115.00 kV] N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Sand Dunes - Warden #2 115 kV 100
Diablo 305.06 Line BENTNAVA (48039) TO BENTON (40097) CKT 1 [115.00 - 115.00 kV] BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden 100
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 26 of 52
Thermal Performance
Thermal performance results are given in two sections: those results produced by the project additions without Project #43 generating
any energy, and those results produced when Project #43 is operating at the maximum requested output of 150 MW.
Base Case Impact
Projects necessary to interconnect Project #43 clear 28 existing facility thermal violations in the cases used in this study (See Table 9).
Table 9: Base Case violations cleared by Mitigating Projects
16HS 16HW 20Hs
Proj Proj Proj
Row Labels Ref Value Percent Percent Ref Value Percent Percent Ref Value Percent Percent
BF: A253 Warden 115 kV, Lind-Warden
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 74.296 270.913 100.49 25.83
BF: A254 Warden 115 kV, Larson-Sand Dunes-Warden
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 74.296 271.24 100.61 25.86
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at SOTHELOT 74.296 532.923 197.67 45.35
OTHELOSS (48309) -> OTHELLO (48307) CKT 1 at OTHELLO 80.912 289.992 100.63 25.68
BUS: Warden 115 kV
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 74.296 270.913 100.49 25.83
N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Sand Dunes - Warden #2 115 kV
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at SOTHELOT 74.296 532.928 197.68 45.35
OTHELOSS (48309) -> OTHELLO (48307) CKT 1 at OTHELLO 80.912 289.995 100.63 25.68
N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 129.746 320.438 120.43 33.3 145.833 369.53 138.88 35.94
N-1: Benton - Midway 230 kV + T-1: White Bluff #1 230/115 kV
SOTHELOT (48393) -> BENTNAVA (48039) CKT 1 at SOTHELOT
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 317.348 119.27 30.6
N-1: Benton - Othello SS 115 kV (BENT-SOT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at OTHELOSS 129.746 277.176 104.17 26.79 145.833 285.305 107.22 27.57
N-1: Columbia - Larson 230 kV + N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 171.537 477.016 121.81 45.28
N-1: Columbia - Larson 230 kV + N-1: Potholes - Sand Dunes 230 kV
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 171.537 477.016 121.81 45.28
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at SOTHELOT 74.296 273.282 101.37 29.01
N-1: Columbia - Rocky Ford 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 267.825 100.65 26.06
N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 273.408 102.75 26.57
BaseBaseBase
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16HS 16HW 20Hs
Proj Proj Proj
Row Labels Ref Value Percent Percent Ref Value Percent Percent Ref Value Percent Percent
N-1: Devils Gap - Stratford 115 kV (STR-WIL) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 270.302 101.59 26.3
N-1: Dworshak - Hatwai 500 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 280.748 105.51 27.31
N-1: Dworshak - Taft 500 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 279.045 104.87 27.15
N-1: Hatwai - Lower Granite 500 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 266.584 100.19 25.94
N-1: Larson - Wheeler 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 271.071 101.87 26.38
N-1: Lind - Warden 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 129.746 278.623 104.71 28.97 145.833 311.375 117.02 30.2
N-1: Othello SS - Warden #1 115 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
BENTNAVA (48039) -> SOTHELOT (48393) CKT 1 at BENTNAVA 74.296 270.812 100.45 25.82
N-1: Othello SS - Warden #2 115 kV (WAR-L&R) + T-1: Benton 230/115 kV
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 129.746 320.32 120.38 33.29 145.833 369.394 138.83 35.93
N-1: Othello SS - Warden #2 115 kV (WAR-L&R) + T-1: White Bluff #1 230/115 kV
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 129.746 291.004 109.37 30.35 145.833 335.132 125.95 32.6
N-1: Sand Dunes - Wheeler 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 275.464 103.53 26.8
T-1: Benton 230/115 kV + T-1: White Bluff #1 230/115 kV
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 317.287 119.24 30.6
T-1: Sickler-Douglas #1 500/230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 145.833 268.854 101.04 26.16
BaseBaseBase
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 28 of 52
Project #43 at Full Requested Output
The Transmission System changes recommended by this study clear all facility thermal
violations created by Project #43 when it is operating at full requested output. Table 10 presents
a sample of facility thermal violations cleared by the proposed projects (values given in Percent
Loading).
Table 10: Representative sample of Thermal Percent Overloads cleared by proposed projects
Ctg / Element 16HsBase 16HsProj 20HsBase 20HsProj
N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (OSS-L&R)
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 232.83 63.16 228.84 62.73
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 205.49 53.58 199.35 52.82
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 136.76 39.45 156.9 40.99
N-1: Benton - Midway 230 kV + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 231.11 63.15 228.25 62.81
OTHELOSS (48309) -> OTHELLO (48307) CKT 1 at OTHELLO 74.17 20.42 76.33 21.08
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 202.34 53.38 198.13 52.61
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 173.15 50.23 202.6 52.56
N-1: Devils Gap - Lind 115 kV (LIN-RIT) + N-1: Lind - Washtucna 115 kV
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 253.84 69.63 251.49 69.35
OTHELLO (48307) -> OTHELOSS (48309) CKT 1 at OTHELLO 29.83 7.23 28.43 6.85
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 224.81 59.81 221.32 59.27
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 88.69 25.45 101.59 25.98
N-1: Othello SS - Warden #1 115 kV + T-1: White Bluff #1 230/115 kV
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 230.72 63.15 227.66 62.82
OTHELLO (48307) -> OTHELOSS (48309) CKT 1 at OTHELLO 93.69 29.11 104.4 29.37
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 201.61 53.3 196.85 52.59
N-1: Othello SS - Warden #2 115 kV (OSS-L&R) + T-1: Benton 230/115 kV
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 232.87 63.16 228.88 62.73
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 205.56 53.59 199.43 52.83
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 136.75 39.45 156.87 40.98
N-1: Othello SS - Warden #2 115 kV (WAR-L&R) + T-1: Benton 230/115 kV
LIND (48187) -> ROXBORO (48375) CKT 1 at LIND 231.14 63.15 228.29 62.8
OTHELOSS (48309) -> OTHELLO (48307) CKT 1 at OTHELLO 74.15 20.42 76.3 21.07
ROXBORO (48375) -> WARDEN A (48455) CKT 1 at ROXBORO 202.41 53.38 198.21 52.61
WARDEN A (48455) -> OTHELOSS (48309) CKT 1 at WARDEN A 173.1 50.21 202.55 52.54
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LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 29 of 52
Voltage Performance
Base Case Voltage Performance
There were 3,999 base case low-voltage violations recorded during this study, and the mitigating
projects cleared 161 of those violations. Cleared voltage violations are shown in Table 11.
Table 11: Voltage violations cleared by mitigating projects
Contingency / Bus 16Hs 16Hw 20Hs
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden
DELIGHT (47025)0.8484 0.9463
LEE&REYN (48308)0.8695
LIND (48187)0.8505 0.9479
MARENGO (48221)0.8481 0.9459
OTHELLO (48307)0.8702
OTHELOSS (48309)0.8794
RALSTONB (47073)0.8485 0.9462
RITZVILL (48365)0.8384 0.9370
ROXBORO (48375)0.8495 0.9439
SOTHELLO (48391)0.8766
SOTHELOT (48393)0.8809
WARDEN A (48455)0.8683
WASHTUNA (48457)0.8479 0.9459
BUS: Sand Dunes 115 kV
DELIGHT (47025)0.9406
LEE&REYN (48308)0.9490
LIND (48187)0.9422
MARENGO (48221)0.9402
OTHELLO (48307)0.9493
RALSTONB (47073)0.9405
RITZVILL (48365)0.9314 0.9464
ROXBORO (48375)0.9381
WASHTUNA (48457)0.9402
N-1: 3TM Larson - Sand Dunes - Warden 115 kV + N-1: Sand Dunes - Warden #2 115 kV
DELIGHT (47025)0.8484 0.9483
LEE&REYN (48308)0.8695
LIND (48187)0.8505 0.9499
MARENGO (48221)0.8481 0.9479
OTHELLO (48307)0.8701
OTHELOSS (48309)0.8794
RALSTONB (47073)0.8485 0.9482
RITZVILL (48365)0.8384 0.9390
ROXBORO (48375)0.8495 0.9458
SOTHELLO (48391)0.8766
SOTHELOT (48393)0.8809
WARDEN A (48455)0.8683
WASHTUNA (48457)0.8479 0.9479
N-1: Bell - Coulee #3 230 kV + N-1: Dworshak - Taft 500 kV
PINE CRK (48317)1.0086
Staff_PR_135 Attachment C Page 29 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 30 of 52
Contingency / Bus 16Hs 16Hw 20Hs
N-1: Benton - Midway 230 kV + N-1: Sand Dunes - Warden #2 115 kV
DELIGHT (47025)0.9425
LEE&REYN (48308)0.9488
LIND (48187)0.9442
MARENGO (48221)0.9421
OTHELLO (48307)0.9488
RALSTONB (47073)0.9424
RITZVILL (48365)0.9497 0.9332
ROXBORO (48375)0.9403
WASHTUNA (48457)0.9421
N-1: Benton - Midway 230 kV + S-1: Lind 115kV Switched Shunt
RITZVILL (48365)0.9427
N-1: Benton - Othello SS 115 kV (BENT-SOT) + N-1: Othello SS - Warden #2 115 kV (WAR-L&R)
LEE&REYN (48308)0.9477 0.9493
OTHELLO (48307)0.9482 0.9499
N-1: Benton - Othello SS 115 kV (BENT-SOT) + S-1: Lind 115kV Switched Shunt
DELIGHT (47025)0.9490 0.9428
LIND (48187)0.9444
MARENGO (48221)0.9486 0.9424
RALSTONB (47073)0.9489 0.9427
RITZVILL (48365)0.9399 0.9335
ROXBORO (48375)0.9492
WASHTUNA (48457)0.9486 0.9424
N-1: Benton - Othello SS 115 kV (OSS-SOT) + N-1: Sand Dunes - Warden #2 115 kV
DELIGHT (47025)0.9452
LIND (48187)0.9468
MARENGO (48221)0.9448
RALSTONB (47073)0.9451
RITZVILL (48365)0.9460 0.9359
ROXBORO (48375)0.9428
WASHTUNA (48457)0.9448
N-1: Benton - Othello SS 115 kV (OSS-SOT) + S-1: Lind 115kV Switched Shunt
RITZVILL (48365)0.9459
N-1: Columbia - Larson 230 kV + N-1: Sand Dunes - Warden #2 115 kV
DELIGHT (47025)0.9478
LIND (48187)0.9494
MARENGO (48221)0.9474
RALSTONB (47073)0.9477
RITZVILL (48365)0.9387
ROXBORO (48375)0.9451
WASHTUNA (48457)0.9474
N-1: Dworshak - Taft 500 kV + N-1: Addy - Gifford 115 kV
PINE CRK (48317)1.0090
N-1: Dworshak - Taft 500 kV + N-1: Appleway - Ramsey 115 kV
PINE CRK (48317)1.0091
N-1: Dworshak - Taft 500 kV + N-1: Lind - Shawnee 115 kV (SHN-EWN)
PINE CRK (48317)1.0093
Staff_PR_135 Attachment C Page 30 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 31 of 52
Contingency / Bus 16Hs 16Hw 20Hs
N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + N-1: Sand Dunes - Warden #2 115 kV
RITZVILL (48365)0.9438
ROXBORO (48375)0.9500
N-1: Frenchman - Potholes (G) - Sand Dunes 230 kV + S-1: Lind 115kV Switched Shunt
RITZVILL (48365)0.9477
N-1: Potholes - Sand Dunes 230 kV + N-1: Sand Dunes - Warden #2 115 kV
RITZVILL (48365)0.9438
ROXBORO (48375)0.9500
N-1: Potholes - Sand Dunes 230 kV + S-1: Lind 115kV Switched Shunt
RITZVILL (48365)0.9477
N-1: Sand Dunes - Warden #2 115 kV + S-1: Benton 115kV Switched Shunt
RITZVILL (48365)0.9458
N-1: Sand Dunes - Warden #2 115 kV + S-1: Larson 115kV Switched Shunt
RITZVILL (48365)0.9454 0.9493
N-1: Sand Dunes - Warden #2 115 kV + S-1: Lind 115kV Switched Shunt
DELIGHT (47025)0.9263 0.9305
LIND (48187)0.9280 0.9322
MARENGO (48221)0.9259 0.9301
RALSTONB (47073)0.9262 0.9304
RITZVILL (48365)0.9170
ROXBORO (48375)0.9329 0.9372
WASHTUNA (48457)0.9259 0.9300
N-1: Sand Dunes - Warden #2 115 kV + S-1: Othello SS 115kV Switched Shunt
DELIGHT (47025)0.9491
MARENGO (48221)0.9487
RALSTONB (47073)0.9490
RITZVILL (48365)0.9400 0.9439
ROXBORO (48375)0.9464
WASHTUNA (48457)0.9487
N-1: Sand Dunes - Warden #2 115 kV + S-1: San Dunes 115kV Switched Shunt
DELIGHT (47025)0.9481
LIND (48187)0.9497
MARENGO (48221)0.9477
RALSTONB (47073)0.9481
RITZVILL (48365)0.9390 0.9480
ROXBORO (48375)0.9455
WASHTUNA (48457)0.9478
N-1: Sand Dunes - Warden #2 115 kV + T-1: Benton 230/115 kV
DELIGHT (47025)0.9430
LEE&REYN (48308)0.9492
LIND (48187)0.9447
MARENGO (48221)0.9426
OTHELLO (48307)0.9493
RALSTONB (47073)0.9429
RITZVILL (48365)0.9337
ROXBORO (48375)0.9407
WASHTUNA (48457)0.9426
N-1: Sand Dunes - Warden #2 115 kV + T-1: Larson 230/115 kV
RITZVILL (48365)0.9480 0.9461
Staff_PR_135 Attachment C Page 31 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 32 of 52
Contingency / Bus 16Hs 16Hw 20Hs
N-1: Sand Dunes - Warden #2 115 kV + T-1: Rocky Ford 230/115 kV
RITZVILL (48365)0.9494
N-1: Sand Dunes - Warden #2 115 kV + T-1: White Bluff #1 230/115 kV
RITZVILL (48365)0.9413
ROXBORO (48375)0.9480
N-1: Shawnee - Thornton 230 kV + T-1: Hatwai 500/230 kV
BENEWAH (48037)1.0049
MOSCOW (48249)1.0042
PINE CRK (48317)1.0069
N-1: Walla Walla - Wanapum 230 kV + T-1: Hatwai 500/230 kV
BENEWAH (48037)1.0046
PINE CRK (48317)1.0042
S-1: Larson 115kV Switched Shunt + S-1: Lind 115kV Switched Shunt
RITZVILL (48365)0.9484
S-1: Lind 115kV Switched Shunt + S-1: Othello SS 115kV Switched Shunt
RITZVILL (48365)0.9475
S-1: Lind 115kV Switched Shunt + S-1: San Dunes 115kV Switched Shunt
RITZVILL (48365)0.9434 0.9445
S-1: Lind 115kV Switched Shunt + T-1: Benton 230/115 kV
RITZVILL (48365)0.9431
S-1: Lind 115kV Switched Shunt + T-1: Larson 230/115 kV
RITZVILL (48365)0.9497
S-1: Lind 115kV Switched Shunt + T-1: White Bluff #1 230/115 kV
RITZVILL (48365)0.9464
T-1: Hatwai 500/230 kV + T-1: Benewah 230/115 kV
PINE CRK (48317)1.0100
Staff_PR_135 Attachment C Page 32 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 33 of 52
Voltage Performance with Project #43
Voltage adequacy studies were performed to determine the theoretical maximum output allowable from Project #43. This maximum
output was derived evaluating contingencies and increasing the output from Project #43 (sinking that output into Avista generation)
until the voltage collapsed (i.e. the case became numerically unstable).
Figure 6 shows all-lines-in-service voltage performance with switched shunts disabled and Project #43 generating no reactive power.
This plot shows voltage performance below 0.95 PU when Project #43 output exceeds ~120 MW.
Figure 6: Voltage performance with switched shunts disabled and Project #43 generating no reactive power
Build Date: August 20, 2015
base case: LIND_115.0 (48187)base case: OTHELLO_115.0 (48307)base case: RITZVILL_115.0 (48365)base case: ROXBORO_115.0 (48375)base case: WARDEN A_115.0 (48455)
Nominal Shift
16015515014514013513012512011511010510095908580757065605550454035302520151050
PU
V
o
l
t
1
0.99
0.98
0.97
0.96
0.95
0.94
0.93
0.92
0.91
0.9
0.89
0.88
0.87
0.86
0.85
0.84
0.83
Staff_PR_135 Attachment C Page 33 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 34 of 52
Figure 7 shows voltage performance when switched shunts are enabled and Project #43 is generating no reactive power. This plot
shows an unacceptable voltage swing as Project #43 generation moves between 40 and 120 MW, after which reactive support switches
in to accommodate Project #43 generation increases.
Figure 7: Voltage performance with switched shunts enabled and Project #43 generating no reactive power
Build Date: August 20, 2015
base case: LIND_115.0 (48187)base case: OTHELLO_115.0 (48307)base case: RITZVILL_115.0 (48365)base case: ROXBORO_115.0 (48375)base case: WARDEN A_115.0 (48455)
Nominal Shift
17016516015515014514013513012512011511010510095908580757065605550454035302520151050
PU
V
o
l
t
1
0.995
0.99
0.985
0.98
0.975
0.97
0.965
0.96
0.955
0.95
0.945
0.94
0.935
0.93
0.925
0.92
0.915
0.91
0.905
0.9
0.895
0.89
Staff_PR_135 Attachment C Page 34 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 35 of 52
Figure 8 shows adequate voltage performance through the full-range of requested generation up to 150 MW when Project #43 is
operated with a 0.95 leading/lagging power factor.
Figure 8: Voltage performance with switched shunts enabled and Project #43 generating reactive power at 0.95 leading/lagging.
Appendix G to Avista’s Large Generator Interconnection Agreement states, “A wind generating plant shall maintain a power factor
within the range of 0.95 leading to 0.95 lagging, measured at the Point of Interconnection as defined in this Agreement, if the
Transmission Provider’s System Impact Study shows that such a requirement is necessary to ensure safety or reliability”. This study
shows that Project #43 must be operated with a boundary power factor range of 0.95 leading/lagging.
Build Date: August 20, 2015
base case: LIND_115.0 (48187)base case: OTHELLO_115.0 (48307)base case: RITZVILL_115.0 (48365)base case: ROXBORO_115.0 (48375)base case: WARDEN A_115.0 (48455)
Nominal Shift
24524023523022522021521020520019519018518017517016516015515014514013513012512011511010510095908580757065605550454035302520151050
PU
V
o
l
t
1
0.995
0.99
0.985
0.98
0.975
0.97
0.965
0.96
0.955
0.95
0.945
0.94
0.935
0.93
0.925
0.92
0.915
0.91
0.905
0.9
Staff_PR_135 Attachment C Page 35 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 36 of 52
Contingency Voltage Performance
The worst case voltage performance during contingencies occurred for a breaker failure (GB1250) within the Sand Dunes station on
the Sand Dunes – Warden 115 kV Transmission Line. Figure 9 shows voltage performance for select buses during the contingency
with Project #43 generating no reactive power.
Figure 9: Worst-case contingent voltage performance with Project #43 generating no reactive power.
Build Date: August 20, 2015
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: LIND_115.0 (48187)BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: OTHELLO_115.0 (48307)
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: RITZVILL_115.0 (48365)BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: ROXBORO_115.0 (48375)
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: WARDEN A_115.0 (48455)
Nominal Shift
11010810610410210098969492908886848280787674727068666462605856545250484644424038363432302826242220181614121086420
PU
V
o
l
t
0.985
0.98
0.975
0.97
0.965
0.96
0.955
0.95
0.945
0.94
0.935
0.93
0.925
0.92
0.915
0.91
0.905
0.9
0.895
0.89
0.885
0.88
0.875
0.87
0.865
0.86
0.855
0.85
Staff_PR_135 Attachment C Page 36 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 37 of 52
Figure 10 shows adequate voltage performance during the worst-case contingency when Project #43 is operated with a 0.95
leading/lagging power factor.
Figure 10: Worst-case contingent voltage performance with Project #43 generating 0.95 PU leading/lagging power factor
Build Date: August 20, 2015
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: LIND_115.0 (48187)BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: OTHELLO_115.0 (48307)
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: RITZVILL_115.0 (48365)BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: ROXBORO_115.0 (48375)
BF: GB1250 Sand Dunes 115 kV, Larson-Sand Dunes-Warden: WARDEN A_115.0 (48455)
Nominal Shift
18518017517016516015515014514013513012512011511010510095908580757065605550454035302520151050
PU
V
o
l
t
0.992
0.99
0.988
0.986
0.984
0.982
0.98
0.978
0.976
0.974
0.972
0.97
0.968
0.966
0.964
0.962
0.96
0.958
0.956
0.954
0.952
0.95
0.948
0.946
0.944
0.942
0.94
0.938
0.936
0.934
0.932
0.93
0.928
0.926
0.924
0.922
0.92
0.918
0.916
Staff_PR_135 Attachment C Page 37 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 38 of 52
Impacted Transmission Facilities
A preliminary sensitivity analysis was performed in order to determine the transmission elements
affected by the proposed Project #43 interconnection. This analysis was completed through the
use of the Power Transfer Distribution Factor (PTDF) tool within PowerWorld Simulator. The
point of receipt (POR) modeled was the Project #43 generation facility. The selection of the
point of delivery (POD) presumes an assumption on where the energy from the interconnecting
project is delivered therefore yielding different sensitivity results. This study analyzed two
PODs:
1. All generators owned and/or operated by Avista, excluding Project #43 (Table 12
representing the interconnecting project as a network resource for Network Resource
Interconnection Service)
2. All generators in the Western Interconnection excluding those owned and/or operated by
Avista (Table 13 representing an energy resource for Energy Resource Interconnection
Service).
These studies do not cover all possibilities of where the energy from the interconnecting project
may be scheduled, but they do provide a strong indication of what transmission elements are
affected. Common elements showing sensitivity with different POD assumptions indicate
transmission elements that should be monitored closely and may indicate other Affected
Systems.
Avista coordinated this study work with the following noted Affected Systems:
Bonneville Power Administration
Grant County PUD
Staff_PR_135 Attachment C Page 38 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 39 of 52
Table 12: PTDF with Avista Generation balancing Project #43
From Number From Name To Number To Name Circuit % PTDF From Nom kV (Max) Nom kV (Min) Owner Name From Owner Name To
48187 LIND 48375 ROXBORO 1 92.86 115 115 Avista Corp.Avista Corp.
48375 ROXBORO 48455 WARDEN A 1 89.51 115 115 Avista Corp.Avista Corp.
48455 WARDEN A 46117 WARDEN T 1 26.93 115 115 Avista Corp.Grant PUD
46119 WHEEL TI 46121 WHEEL TP 1 26.91 115 115 Grant PUD Grant PUD
46130 BASS JCT 46119 WHEEL TI 1 26.87 115 115 Grant PUD Grant PUD
46043 MAE VL T 46166 POTHOLEG 1 22.53 230 230 Grant PUD Grant PUD
48309 OTHELOSS 48393 SOTHELOT 1 21.45 115 115 Avista Corp.Avista Corp.
48039 BENTNAVA 40097 BENTON 1 20.68 115 115 Avista Corp.Bonneville Power Admin
46300 ROCKYFDG 46299 NQUINCYT 1 20.59 230 230 Grant PUD Grant PUD
46151 LARSON 46300 ROCKYFDG 1 20.53 230 230 Grant PUD Grant PUD
40091 BELL BPA 40092 BELL S4 1 20.03 500 230 Bonneville Power Admin Bonneville Power Admin
46166 POTHOLEG 40851 POTHOLES 1 17.22 230 230 Grant PUD Bonneville Power Admin
41346 MIDWAYB1 41347 MIDWAYB2 BS 16.07 230 230 Bonneville Power Admin Bonneville Power Admin
40553 HOT SPR 40551 HOT SPR 1 13 500 230 Bonneville Power Admin Bonneville Power Admin
46039 LARSON 46155 ROCKYFD 1 11.82 115 115 Grant PUD Grant PUD
48281 NOXON 48285 NOXON12 1 11.62 230 14.4 Avista Corp.Avista Corp.
90011 BELLAN11 40624 LANCASTR 1 11.1 230 230 Bonneville Power Admin Bonneville Power Admin
40090 BELL S3 90011 BELLAN11 1 11.06 230 230 Bonneville Power Admin Bonneville Power Admin
40369 DWORSHAK 40521 HATWAI 1 -10.03 500 500 Bonneville Power Admin Bonneville Power Admin
47031 DOUGLAS 46833 ROCKYRH3 1 -10.54 230 230 Douglas PUD Chelan PUD
46151 LARSON 46039 LARSON 1 -11.09 230 115 Grant PUD Grant PUD
48309 OTHELOSS 48455 WARDEN A 1 -12.02 115 115 Avista Corp.Avista Corp.
40973 SICKLER 47031 DOUGLAS 1 -12.18 500 230 Bonneville Power Admin Douglas PUD
41113 VANTAGE 41112 VANTAGES 1 -12.33 500 230 Bonneville Power Admin Bonneville Power Admin
41111 VANTAGEN 46169 WANAPUM 1 -12.43 230 230 Bonneville Power Admin Grant PUD
41113 VANTAGE 41111 VANTAGEN 2 -12.54 500 230 Bonneville Power Admin Bonneville Power Admin
40553 HOT SPR 41057 TAFT 1 -13 500 500 Bonneville Power Admin Bonneville Power Admin
40499 HANFORD 41113 VANTAGE 1 -17.77 500 500 Bonneville Power Admin Bonneville Power Admin
40521 HATWAI 40679 LOW GRAN 1 -18.16 500 500 Bonneville Power Admin Bonneville Power Admin
48039 BENTNAVA 48393 SOTHELOT 1 -20.68 115 115 Avista Corp.Avista Corp.
46298 WQUINCYT 46299 NQUINCYT 1 -20.69 230 230 Grant PUD Grant PUD
40261 COLUMBIA N 46298 WQUINCYT 1 -20.77 230 230 Bonneville Power Admin Grant PUD
46043 MAE VL T 46089 SANDUNES 1 -22.53 230 230 Grant PUD Grant PUD
40288 COULE R1 40287 COULEE 6 -24.02 500 500 Bonneville Power Admin USBR
40091 BELL BPA 40288 COULE R1 6 -24.06 500 500 Bonneville Power Admin Bonneville Power Admin
46039 LARSON 46121 WHEEL TP 1 -25.53 115 115 Grant PUD Grant PUD
46091 SCHRAG T 46117 WARDEN T 1 -26.84 115 115 Grant PUD Grant PUD
46085 RUFF TP 46091 SCHRAG T 1 -26.85 115 115 Grant PUD Grant PUD
46130 BASS JCT 46085 RUFF TP 1 -26.87 115 115 Grant PUD Grant PUD
46089 SANDUNES 46087 SANDUNES 1 -31.92 230 115 Grant PUD Grant PUD
46087 SANDUNES 48455 WARDEN A 1 -37.52 115 115 Grant PUD Avista Corp.
48187 LIND 48362 RATTFLT_SUB 1 -92.86 115 115 Avista Corp.First Wind
Staff_PR_135 Attachment C Page 39 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 40 of 52
Table 13: PTDF with All WECC Generation (minus AVA gen) balancing Project #43
From Number From Name To Number To Name Circuit % PTDF From Nom kV (Max) Nom kV (Min) Owner Name From Owner Name To
48187 LIND 48375 ROXBORO 1 92.86 115 115 Avista Corp.Avista Corp.
48375 ROXBORO 48455 WARDEN A 1 89.51 115 115 Avista Corp.Avista Corp.
48455 WARDEN A 46117 WARDEN T 1 26.9 115 115 Avista Corp.Grant PUD
46119 WHEEL TI 46121 WHEEL TP 1 26.88 115 115 Grant PUD Grant PUD
46130 BASS JCT 46119 WHEEL TI 1 26.84 115 115 Grant PUD Grant PUD
46043 MAE VL T 46166 POTHOLEG 1 22.51 230 230 Grant PUD Grant PUD
48309 OTHELOSS 48393 SOTHELOT 1 21.51 115 115 Avista Corp.Avista Corp.
48039 BENTNAVA 40097 BENTON 1 20.74 115 115 Avista Corp.Bonneville Power Admin
46300 ROCKYFDG 46299 NQUINCYT 1 20.58 230 230 Grant PUD Grant PUD
46151 LARSON 46300 ROCKYFDG 1 20.53 230 230 Grant PUD Grant PUD
46166 POTHOLEG 40851 POTHOLES 1 16.88 230 230 Grant PUD Bonneville Power Admin
41346 MIDWAYB1 41347 MIDWAYB2 BS 16.13 230 230 Bonneville Power Admin Bonneville Power Admin
30055 GATES 30073 GATMID11 1 12.88 500 500 Pacific Gas and Electric Pacific Gas and Electric
30073 GATMID11 30060 MIDWAY 1 12.88 500 500 Pacific Gas and Electric Pacific Gas and Electric
46039 LARSON 46155 ROCKYFD 1 11.69 115 115 Grant PUD Grant PUD
40837 PONDROSA 90099 PONSUM11 1 11.45 500 500 Bonneville Power Admin Bonneville Power Admin
90099 PONSUM11 90100 PONSUM12 1 11.32 500 500 Bonneville Power Admin Bonneville Power Admin
90100 PONSUM12 90101 PONSUM13 1 11.32 500 500 Bonneville Power Admin Bonneville Power Admin
90101 PONSUM13 90102 PONSUM14 1 11.23 500 500 Bonneville Power Admin Bonneville Power Admin
90102 PONSUM14 41043 SUMMER L 1 11.21 500 500 Bonneville Power Admin Bonneville Power Admin
30050 LOSBANOS 30070 LOSMID11 1 11.04 500 500 Pacific Gas and Electric Pacific Gas and Electric
30070 LOSMID11 30071 LOSMID12 1 10.99 500 500 Pacific Gas and Electric Pacific Gas and Electric
30071 LOSMID12 30072 LOSMID13 1 10.99 500 500 Pacific Gas and Electric Pacific Gas and Electric
30072 LOSMID13 30060 MIDWAY 1 10.99 500 500 Pacific Gas and Electric Pacific Gas and Electric
40489 GRIZZLY 40488 GRIZZ R3 1 10.95 500 500 Bonneville Power Admin Bonneville Power Admin
40488 GRIZZ R3 40837 PONDROSA 1 10.94 500 500 Bonneville Power Admin Bonneville Power Admin
30040 TESLA 30050 LOSBANOS 1 10.31 500 500 Pacific Gas and Electric Pacific Gas and Electric
40061 ASHE 40499 HANFORD 1 -10.19 500 500 Bonneville Power Admin Bonneville Power Admin
46151 LARSON 46039 LARSON 1 -11.1 230 115 Grant PUD Grant PUD
40973 SICKLER 47031 DOUGLAS 1 -11.38 500 230 Bonneville Power Admin Douglas PUD
48309 OTHELOSS 48455 WARDEN A 1 -12.06 115 115 Avista Corp.Avista Corp.
41113 VANTAGE 41112 VANTAGES 1 -12.28 500 230 Bonneville Power Admin Bonneville Power Admin
41111 VANTAGEN 46169 WANAPUM 1 -12.38 230 230 Bonneville Power Admin Grant PUD
41113 VANTAGE 41111 VANTAGEN 2 -12.49 500 230 Bonneville Power Admin Bonneville Power Admin
40499 HANFORD 41113 VANTAGE 1 -18.95 500 500 Bonneville Power Admin Bonneville Power Admin
46298 WQUINCYT 46299 NQUINCYT 1 -20.69 230 230 Grant PUD Grant PUD
48039 BENTNAVA 48393 SOTHELOT 1 -20.74 115 115 Avista Corp.Avista Corp.
40261 COLUMBIA N 46298 WQUINCYT 1 -20.76 230 230 Bonneville Power Admin Grant PUD
46043 MAE VL T 46089 SANDUNES 1 -22.51 230 230 Grant PUD Grant PUD
46039 LARSON 46121 WHEEL TP 1 -25.48 115 115 Grant PUD Grant PUD
46091 SCHRAG T 46117 WARDEN T 1 -26.81 115 115 Grant PUD Grant PUD
46085 RUFF TP 46091 SCHRAG T 1 -26.82 115 115 Grant PUD Grant PUD
46130 BASS JCT 46085 RUFF TP 1 -26.84 115 115 Grant PUD Grant PUD
46089 SANDUNES 46087 SANDUNES 1 -31.89 230 115 Grant PUD Grant PUD
46087 SANDUNES 48455 WARDEN A 1 -37.49 115 115 Grant PUD Avista Corp.
48187 LIND 48362 RATTFLT_SUB 1 -92.86 115 115 Avista Corp.First Wind
Staff_PR_135 Attachment C Page 40 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 41 of 52
Short Circuit Analysis
General:
The proposed Project #43 Wind generation is 150 MW in size and approximately 16 miles from
the Lind 115 kV bus. For the purposes of the System Protection System Impact Study, Project
#43 wind generation POI will be at the Lind 115kV bus. The assumptions for the Project #43
model are:
1. The facility topology of collector strings to station GSU transformers was provided by
Project #43. An equivalent collector system per Table 1 of WECC Wind Power Plant
Power Flow Modeling Guide 2008 was used.
2. 1 – 158.3 MVA wye-wye-delta 3 winding transformer 115/34.5/13.8 kV step up with
9.5% impedance and an X/R ratio of 37.6.
3. 65 - Parallel 1.9MVA pad mount delta-wye 0.69/34.5 kV GSU transformers stepping up
the generation to a 34.5 kV collector system. The pad-mounted transformer positive-
sequence impedance is 9% on the transformer MVA base, with X/R ratio of 10. The pad-
mounted transformer zero-sequence impedance is 8.5% on the transformer MVA base,
with X/R ratio of 10.6.
4. 65 - 2.3 Megawatt Type 4 machines providing approximately 1 per unit fault current at
26 degrees.
5. The 115kV interconnection transmission line was modeled as 12 miles of 795 ACSR
conductor. The feasibility study assumption was 16 miles of conductor.
Staff_PR_135 Attachment C Page 41 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 42 of 52
ASPEN Model Development:
Station Transformers
The 115/34.5/13.8 kV 158.3 MVA wye-wye-delta three-winding transformer was modeled using
data provided by Project #43. The impedances are as follows:
Windings
MVA
Base R+ (p.u.) X+ (p.u.) Z+ (p.u.) R0 (p.u.) X0 (p.u.) Z0 (p.u.)
ZP-S 100.0 0.001595 0.059979 0.060000 0.001436 0.053981 0.054000
ZS-T 100.0 0.000853 0.022184 0.022200 0.000768 0.019965 0.019980
ZP-T 100.0 0.003696 0.096103 0.096174 0.003327 0.086493 0.086557
Collector String and Pad Mount GSUs
The impedances were converted a 100 MVA base is as follows:
Collector string
The collector string equivalent line parameters were based on information provided by Project
#43. Project #43 used the ‘WECC Guide for Representation of Photovoltaic Systems in Large-
Scale Load-Flow Simulations’ (January 2011) as the method to determine the line parameters.
The positive and zero-sequence impedances are shown below:
R1 (pu) X1 (pu) R0 (pu) X0 (pu) Bc
Capacitive
Susceptance
(pu)
0.01104 0.00960 0.03833 0.00627 0.0458477
Pad Mount GSU – 65 units parallel
The positive and zero-sequence impedances were calculated using data provided by Project #43.
Staff_PR_135 Attachment C Page 42 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 43 of 52
Wind Turbines
The generators for Project #43 were modeled as a single 150 MVA machine the equivalence of
65 – 2.3 MVA wind generators. The wind turbines were identified as Type IV. Type IV turbines
typically will not provide more than 1 per unit short circuit contribution at an angle of
approximately 26 degrees into the system. The wind turbine model used the worst case scenario
with all machines on line (150 MVA). Since the WTG transformer is a Wye-Delta blocking the
negative and zero sequence contributions to a single line to ground 115 kV transmission fault, all
sequence parameters were set equal. The subtransient, transient and synchronous impedances
were all set the same. The 150 MVA machine parameters are as follows:
Fault Analysis Study
A short circuit analysis study was performed to determine if Avista’s installed equipment is
adequate for the proposed Project #43 POI. The following analysis was performed:
1. Perform 3LG and SLG close-in faults on each line terminal breaker at affected buses by the
interconnection.
2. Perform 3LG and SLG close-in faults on each bus affected by the interconnection
3. Compare resulting fault duties to breaker or power fuse interrupt ratings.
Fault Duty Comparisons
The changes in fault duties in amperes due to the addition of the Project #43 150 MW of
generation networked to the Lind bus are shown below.
Staff_PR_135 Attachment C Page 43 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 44 of 52
System
Location
3LG w/out
Generation
3LG with
Generation
Percent
Change
1LG w/out
Generation
1LG with
Generation
Percent
Change
Lind Bus 4033 4384 9% 2621 3873 48%
Lind/ Shawnee
Terminal
3137 3491 11% 2074 3484 68%
Lind/ Devils
Gap Terminal
3180 3533 11% 2020 3446 71%
Lind/ Warden
Terminal
1749 2142 22% 1148 2827 146%
Lind/
Washtucna
Terminal
4033 4384 9% 2621 3873 48%
Lind 115/13 kV
Transformer
4033 4384 9% 2621 3873 48%
Washtucna 115
kV Bus
1533 1533 0% 957 1049 10%
Ritzville 115
kV Bus
2900 2955 2% 1896 2149 13%
Ralston 115 kV
Bus
2987 3052 2% 1895 2174 15%
Roxboro 115
kV Bus
4937 5094 3% 3205 3747 17%
Delight 115 kV
Bus
2219 2268 2% 1401 1648 18%
Marengo 115
kV Bus
2858 2892 1% 1809 2001 11%
Staff_PR_135 Attachment C Page 44 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 45 of 52
Station Breaker/Device Ratings -
The three-phase and single line to ground fault magnitudes increased in the area as expected. The
Lind 115 kV breaker ratings are 40 kA symmetrical interrupt. The 115 kV power fuses at
Marengo, Washtucna, Ritzville and Lind are rated at 10,000 kA interrupt. The Mark III circuit
switcher rating at Roxboro is 6000/3000 interrupt. The fault duty at the Roxboro 115 kV bus is
approximately 85% of the circuit switcher capability. The interrupting devices at Ralston and
Delight are not Avista assets so are not included in this study.
Summary
Integrating Project #43 Wind generation of 150 MW onto Avista’s 115 kV system increased
fault duties in the Big Bend area. The increased fault duties are well below the interrupting
capability of the breakers. The results show integrating Project #43 Wind generation onto
Avista’s 115 kV system at the requested POI will not impact the capability of the Lind substation
line breakers to interrupt three phase or single phase faults.
Non-Avista facilities in the area affected by the fault duties increase should be reviewed by the
facility owner.
All transmission and distribution relay settings will require a review and coordination
verification for the Big Bend area.
Staff_PR_135 Attachment C Page 45 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 46 of 52
Transient Stability
Method and Criteria
The case primarily used for stability analysis was the 2020 Heavy Summer Case, and the Project
#43 developer provided dynamic models and data for the facilities added to the base cases.
Over 800 contingencies3 were analyzed using the contingency analysis capabilities within
PowerWorld Simulator, and 44 of these contingencies local to Project #43 were further analyzed
in the 2020 Light Summer case as a further check on project performance. This software tool
fully models Remedial Actions Schemes (RAS) and automatically “arms” and applies RAS as
the modeled system conditions dictate. Each scenario was modeled out to 10 seconds.
Historic WECC and Avista requirements for disturbance performance were used to evaluate the
results of the dynamic stability analysis. These requirements are as follows:
System must remain stable.
Maximum allowable transient voltage dip of 25 percent at load buses or 30 percent at
non-load buses.
Maximum allowable transient voltage dip not to exceed 20 percent for more than 20
cycles at load buses.
Minimum allowable frequency of 59.6 Hz for 6 cycles or more at load buses.
Maximum allowable post-transient voltage deviation of 5 percent from pre-disturbance
voltage.
A detailed explanation of performance criteria can be referenced in the WECC TPL – (001 thru
004) – WECC – 1 – CR – System Performance Criteria.
3 Avista contingency analysis development is documented in Avista Standard TP-SPP-06 Contingency Analysis
Staff_PR_135 Attachment C Page 46 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 47 of 52
Transient Stability Results
Transient Stability performance of Project #43 as modeled in the cases used for this study was found to be adequate; no stability
violations were noted. Figure 11 provides an example response of the system in the 2020 Light Summer case during a breaker failure
event on the Othello Switching Station – Warden 115 kV Transmission Line.
Figure 11: Stability plots for select facilities in the 20 Light Sumer case during the BF: A255 @ Othello Switching Station event
Staff_PR_135 Attachment C Page 47 of 52
LGIP #43 System Impact Study Report
PROJECT #43 October 27, 2015 Page 48 of 52
Figure 12: Stability plots for Project #43 power in the 20 Light Sumer case during the BF: A255 @ Othello Switching Station event
Staff_PR_135 Attachment C Page 48 of 52
Note for Project #43 Developer: General utility practice does not allow single generation plants to
serve as the only source of power in an island, and there exists the potential, either by contingency
or maintenance, for Project #43 to become islanded. Figure 13 shows the Avista Transmission
System local to Project #43, and the image shows the two transmission line segments east of Lind
Station that are operated normally open result in Project #43 operating radially from Lind to
Warden stations . Given this configuration, Project #43 will need to be tripped for any outage that
interrupts the transmission connection between Lind and Warden stations. While the stability
models provided by the Developer did trip the plant for all faults studied that island the plant,
Avista would likely employ and explicit tripping scheme for anti-islanding protection.
Figure 13: Transmission System local to Project #43
Staff_PR_135 Attachment C Page 49 of 52
Conclusion
The study work indicates that this interconnection performs adequately and has no adverse impacts
on the Transmission System when the identified network upgrades are completed. The estimated
cost to fully interconnect Project #43 is approximately $22,017,000. This includes the rebuilding
Lind Station and the increase in capacity of local transmission lines. The scheduled interconnection
of Project #43 is dependent on the completion of a Facilities Study, Engineering and Procurement
Agreement, and Interconnection Agreement.
POI Project Output Schedule Total Cost
($000)
Lind Station 150 MW Time to Construct = December 31, 2018 $22,017,000
All construction costs are in 2016-year dollars and are based on engineering judgment with +/- 20%
error. These cost estimates assume that the Project #43 owners are responsible for all necessary
facilities from their facility to the POI.
Operationally the output of Project #43 would have to be curtailed in the event of planned or
extended forced outages on any transmission line segment between the Lind 115kV Switching
Station and Warden 115kV Switching Station. In the event the two 115kV transmission lines east
of Lind are operated closed, they each have maximum thermal loading restrictions of 53MW. Other
transmission outages may require the curtailment of project output as well. A complete analysis of
any transmission capacity impacts and any facilities needed to mitigate such impacts would be
identified through the study process for Transmission Service, once a request for Transmission
Service has been made.
Staff_PR_135 Attachment C Page 50 of 52
Appendix A
ASPEN Model Development:
The following shows the calculations and assumptions used for the 115kV transmission line
parameters.
Option 1
Given
Z+ 115kv=0.00097 0.00538 ohms/mi for 795ACSR115HF then Z0/Z+ = 3.72
Z0 115kV = 0.00313 0.02011 ohms/mi
using the Z0/Z+ ratio then for each line in Option 1:
Miles
LGIR43-LIN Z+ 16 0.01415 0.086780
Z0 0.05264 0.32282
LIN - ROX Z+0.00955 0.05859
Z0 0.03553 0.21794
ROX - WAR Z+0.01275 0.07819
Z0 0.04743 0.290867
WAR - GCPUD Z+0.00170 0.00940
Z0 0.00632 0.034968
WAR - OSS Z+0.03448 0.05336
Z0 0.12827 0.198499
Staff_PR_135 Attachment C Page 51 of 52
Option 2
Given
Z+ 115kv=0.00097 0.00538 ohms/mi for 795ACSR115HF then Z0/Z+ = 3.72
Z0 115kV = 0.00313 0.02011 ohms/mi
using the Z0/Z+ ratio then for each line in Option 2:
Miles
RAL - HIL Z+ 5 0.005308 0.032547
Z0 0.01975 0.12107
LGIR43-RAL Z+ 9 0.005308 0.032547
Z0 0.01975 0.12107
HIL - MAR Z+ 5.5 0.00487 0.02984
Z0 0.01812 0.11100
MAR - EW Z+ 22.8 0.02016 0.12364
Z0 0.07500 0.459941
EW - DIA Z+ 24.3 0.01265 0.07756
Z0 0.04706 0.288523
DIA - SHN Z+ 17.6 0.01556 0.09545
Z0 0.05788 0.355074
LIN - RITZ Z+ 16.8 0.01486 0.09112
Z0 0.05528 0.338966
RITZ - SPR Z+ 18.8 0.01662 0.10196
Z0 0.06183 0.379291
SPR - GAF Z+ 6.3 0.00557 0.03418
Z0 0.02072 0.12715
GAF - REAR Z+ 18 0.01592 0.09762
Z0 0.05922 0.363146
REAR - DGP Z+ 13.9 0.01229 0.07539
Z0 0.04572 0.280451
Staff_PR_135 Attachment C Page 52 of 52