20180329PAC to Staff WY WPSC Set 6 (1-15) (2).pdf

ROCKY MOUNTAINPOWER
A DIVISION OF PACIFICORP 1407 W North Temple,Suite 330
Salt Lake City,Utah 84116
March 6,2018
Meridith Bell
2515 Warren Avenue,Suite 300
Cheyenne,Wyoming 82002
RE:Wyoming Docket 20000-520-EA-17
WPSC 66 Set Data Request (1-15)
Please find enclosed Rocky Mountain Power's Responses to WPSC 6*Set Data Requests 6.6-
6.8 and 6.10-6.15.Also provided are Attachments WPSC 6.10-1 and 6.13.Provided on the
enclosed Confidential CD are Confidential Attachments WPSC 6.6 and 6.10-2.Confidential
information is provided subject to the terms and conditions of the protective agreement in this
proceeding.
If you have any questions,please call me at [phone].
Sincerely,
Stacy Splittstoesser,
Manager,Regulation
Enclosures
C.C.:Lori L.Brand/WPSC [e-mail] (W)
John Burbridge/WPSC [e-mail](W)
Michelle Bohanan/WPSC [e-mail] (W)
Kara Seveland/WPSC [e-mail](W)
Morgan Fish/WPSC [e-mail] (W)
Dave Walker/WPSC [e-mail] (W)
Perry McCollom/WPSC [e-mail](W)
Abigail C.Briggerman/WIEC [e-mail](C)
Patti Penn/WIEC [e-mail](W)
Thor Nelson/WIEC [e-mail] (C)(W)
Emanuel Cocian/WIEC [e-mail](W)
Adele Lee/WIEC [e-mail] (W)
Nik Stoffel/WIEC [e-mail] (C)(W)
Christopher Leger/OCA [e-mail] (C)
Crystal J.McDonough/[e-mail] (C)
Callie Capraro/NLRA [e-mail]
Lisa Tormoen Hickey/[e-mail] (C)
Brandon L.Jensen/RMSC [e-mail](C)
Roxane Perruso/TOTCO [e-mail]
Jane M.France/TOTCO [e-mail] (C)
Constance E.Brooks/Anadarko [e-mail](C)
Danielle Bettencourt/Anadarko [e-mail](C)(W)
Paul Kapp/Anadarko [e-mail] (C)
Lisa Christian/TOTCO [e-mail] (C)
J.Kenneth Barbe/Southland [e-mail] (C)
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.6
WPSC Data Request 6.6
Please provide a system study(ies)showing or explaining what the Company expects the
stability and the reliabilityof the system to be if wind generationis not available in the
various regions of Wyoming.
Response to WPSC Data Request 6.6
As with today's system,the system is stable and reliable when the wind generation is not
available.Heavy transfers and system stress are minimal when the wind generation is not
available.A technical demonstration of this system performance is part of the system
operating limits (SOL)studies,which are performed on an established basis for peak
reliability.An SOL study will be performed for the new Aeolus West path prior to
operation of the Energy Gateway sub-segment D.2 in 2020.Please refer to Confidential
Attachment WPSC 6.6 for a copy of the 2017 TOT 4A/TOT 4B SOL study.
Confidential information is provided subject to the terms and conditions of the protective
agreement in this proceeding.
Respondents:Craig Quist /Robyn Kara
Witness:Rick Vail
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.7
WPSC Data Request 6.7
For question 6.6 please also provide any associated power flow studies.
Response to WPSC Data Request 6.7
As indicated in the Company's response to WPSC Data Request 6.6,no specific power
flow studies have been performed to evaluate a no wind generation condition.However,a
System Operating Limit study will be conducted prior to 2020 and as with today's
system,the system will be designed such that it is stable and reliable when the wind
generationis not available.
Respondents:Craig Quist /Robyn Kara
Witness:Rick Vail
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.8
WPSC Data Request 6.8
Please provide the most recent studies,and/or explain the Company's expectations
regarding the diversityof Wyomingwind resources.
Response to WPSC Data Request 6.8
Expected output from all wind resources is captured in the Company's economic analysis
of the Combined Projects.The effects of low wind and high wind generation are
considered and captured in the new wind and transmission project analysis by the wind
shapes applied in the System Optimizer model (SO model)and the Planning and Risk
(PaR)model.The diversityof these wind shapes accounts for location,turbine
technology,and project size.
The table below reports the physical proximityof the inning bids relative to each other.
Please also refer to the Company's response to WPSC Data Request 6.4:
Distance (mi)
Cedar
Resource Location Springs TB Flats Ekola Flats Uinta
Cedar Springs Converse County -8.3 19.5 238.6
TB Flats 12 miles north east of Medicine Bow 8.3 -15.9 51.6
Ekola Flats 6 miles north west of Medicine Bow 19.5 15.9 -237.9
Uinta 10 miles northeast of Evanston 238.6 51.6 237.9 -
Respondents:Randy Baker
Witness:Rick Link
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.10
WPSC Data Request 6.10
If Dave Johnston Power Plant is decommissioned in 2027,what will be the anticipated
effects on voltage and frequency stability in the Central Wyomingregion?
Response to WPSC Data Request 6.10
Independentof the D.2 Project (Bridger/Anticline-Aeolus)technical analysis that would
support the addition of new wind generationin southeast Wyoming,Transmission
Planning performed a separate analysis "Transmission Assessment of Dave Johnston
Plant Retirement Impacts to New Wyoming Wind GenerationIntegration",which
evaluated 230 kilovolt (kV)facilities necessary to support the Dave Johnston Power Plant
retirement and the addition of new wind facilities.Please refer to Attachment WPSC
6.10-1,which provides a copy of the report,and Confidential Attachment WPSC 6.10-2,
which provides the confidential appendices to the report.PacifiCorp has not performed
additional studies at this time.
Confidential information is provided subject to the terms and conditions of the protective
agreement in this proceeding.
Respondents:Craig Quist /Robyn Kara
Witness:Rick Vail
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.11
WPSC Data Request 6.11
What additions to the bulk transmission system would be needed,if any,to offset any
negative effects of the decommissioning of Dave Johnston?
Response to WPSC Data Request 6.11
Please refer to the Company's response to WPSC Data Request 6.10.
Respondents:Craig Quist /Robyn Kara
Witness:Rick Vail
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.12
WPSC Data Request 6.12
What are the projected costs to make the improvements to the transmission system if
Dave Johnston is decommissioned?
Response to WPSC Data Request 6.12
Please refer to the Company's response to WPSC 6.10.
Respondents:Todd Jensen
Witness:Rick Vail
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.13
WPSC Data Request 6.13
Please provide an update on the Company's ROW acquisition.Please provide copies of
any additional ROW agreements acquired since the Company's last Commission update.
Response to WPSC Data Request 6.13
Please refer to Attachment WPSC 6.13,which provides four signed notice of option
agreements and one signed easement agreement.Right of way offers have been provided
to all landowners with the exception of Anadarko,Union Pacific Railroad and Wyoming
Trust Lands.Anadarko's offer will be made when surveyed legal descriptions and
exhibits are complete as Anadarko requested.Applications are being prepared for Union
Pacific Railroad and WyomingTrust Lands in accordance with established procedures.
Four option agreements and one easement agreement have been signed as indicated in the
attached spreadsheet and signed documents.Negotiations,or attempts at negotiations are
ongoing with the remaining landowners.
Respondents:Todd Jensen
Witness:Rod Fisher
20000-520-EA-17 /Rocky Mountain Power
March 6,2018
WPSC Data Request 6.14
WPSC Data Request 6.14
Please provide the transmission interconnection queue positions for each proposed
generationresource in the Company's current short list.If the projects only have
generationinterconnection queue positions,please indicate and explain.
Response to WPSC Data Request 6.14
The followingare the generation interconnection queue ñumbers for the short-listed
projects:
Ekola Flats -Q0706
TB Flats I -Q0707
TB Flats II-Q0708
Cedar Springs -Q0712
Uinta-Q0715/Q0810
Respondent:Kris Bremer
Witness:Rick Vail