20180105PAC to Staff Attachment_UT_TOT 4A_Gateway.pdf

PACIFICORP
A MIDAMERICAN ENERGY HOLDINGS COMPANY
Date:October 26,2010
To:Planning Coordination Committee
Technical Studies Subcommittee
Operations Committee
Cc:Energy Gateway -WECC Phase 2 Windstar Study Group
Subject:GatewayWest -WECC Phase 2 Windstar Study Group,TOT 4A (Path 37)
Transmission Path RatingReport
Dear PCC,TSS and OC:
The attached Phase 2 study group report reflects the first of five Energy Gateway Project
(Gateway West and Gateway South)Phase 2 path rating review group reports,addressing nine
transmission paths,that will be submitted over the next two months to PCC/OC/TSS for review
Per the Phase 2 requirements outlined in the WECC Procedures for Project Rating Review,
please find enclosed the Gateway West -WECC Phase 2 Windstar Study Group,TOT 4A (Path
37)Transmission Path Rating Report and supporting documents,which was unanimously
approvedby the study group on September 27,2010.This study report was prepared under the
guidance of the project study group for this path and is intended to addresses all comments
identified in the Gateway West Comprehensive Progress Report,applicable to the TOT 4A path,
as well as all questions raised by the study group during the TOT 4A (Path 37)phase 2 technical
studies.By letter dated February 6,2009,the Gateway West project,which includes the TOT
4A path,was granted Phase 2 status.
The Gateway West project updates to the TOT 4A (Path 37)transmission path definition
applicable to these studies consist of a two new single-circuit 230 kV transmission lines to be
constructed between Windstar and Aeolus,as well as looping the Shirley Basin -Freezeout 230
kV line into Aeolus and reconductoring the Dave Johnston -Difficulty-Shirley Basin -Aeolus
230 kV line with 2-1272 ACSR/phase.Rating studies indicate that the Project will increase the
transfer capability of the redefined TOT 4A (Path 37)path from 937 MW to 2175 MW north to
south.The planned in-service date for all path facilities is December of 2016.
By issuance of this letter,we are hereby initiating a 30 day review period of this report by PCC,
TSS and OC.Upon acceptance of the enclosed report by PCC,this path,which is one of many
transmission paths to be defined/redefined under the Gateway West project,should be granted an
Accepted Rating and Phase 3 status.
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Finally,PacifiCorp wishes to thank Basin Electric,Black Hills Power,Idaho Power,
NorthWestern Energy,TransCanada,Tri-State G&T,TransWest Express and Western Area
Power Administration for their participation in the Phase 2 Rating Study Group and
contributions to the final study report.
Your actions in this regards are appreciated.
Should you have any questions,or need additional information,please contact me at (801)220-
4264 or Mr.Ramesh Hariharan at [phone].
Sincerely,
Ûratg guist
Craig Quist,P.E.
Manager,Transmission Development and Planning
PacifiCorp
1407 W.North Temple,Suite 275
Salt Lake City,Utah 84116
TEL:[phone]
CELL:[phone]
Email:[e-mail]
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