The URL can be used to link to this page

Home My WebLink About20171130PAC to Staff 4th Suppl UT - WRA Set 2 (1-2).pdf1407 W.NorthTemple ROCKY MOUNTAIN Salt Lake City,UT 84116 POWER ADIVISION OF PACIFICORP November 21,2017 Nancy Kelly Western Resource Advocates 9463 N.Swallow Rd. Pocatello,ID 83201 Jennifer Gardner Western Resource Advocates 150 South 600 East,Suite 2A Salt Lake City UT 84102 iennifer.gardner@westernresources.ora(C) Penny Anderson penny.anderson@westernresources.ora (W) RE:UT Docket No.17-035-40 WRA 2nd Set Data Request (1-2) Please find enclosed Rocky Mountain Power's Responses to WRA 2nd Set Data Requests 2.1- 2.2.Provided on the enclosed Confidential CD are Confidential Attachment WRA 2.1-1 and 2.1-2.Confidential information is provided subject to Public Service Commission of Utah (UPSC)Rules 746-1-602 and 603. If you have any questions,please call me at (801)220-2823. Sincerely, Jana Saba Manager,Regulation Enclosures C.c.:Dan Kohler/DPU dkoehler@davmarkea.com(C) Dan Peaco/DPU dpeaco@davmarkea.com (C)(W) Aliea Afnan/DPU aafnan@daymarkea.com(W) Béla Vastag/OCS bvastag@utah.gov(C) Philip Hayet/OCS phayet@jkenn.com (C) Gary A.Dodge/UAE gdodge@hidlaw.com (C) Phillip Russell/UAE prussell@hidlaw.com (C) Kevin Higgins/UAEkhineins@eneravstrat.com (C) Neal Townsend/UAE ntownsend@energystrat.com(C)(W) Sophie Hays/UCE sophie@utahcleanenergy.ore(C) Kate Bowman/UCE kate@utahcleanenergy.ore(C)(W) Emma Rieves/UCE emma@utahcleanenergy.org(C)(W) Erika Tedder/DPU dpudatarequest@utah.govetedder@utah.gov(C) Lisa Tormoen Hickey/Interwestlisahickey@newlawaroup.com (_C) Mitch Longson/Interwest mloneson@mc2b.com(C) Peter J.Mattheis/Nucor pjm@smxblaw.com (C) Eric J.Lacey/Nucor eil smxblaw.com (C)(W) 17-035-40 /Rocky Mountain Power November 21,2017 WRA Data Request 2.1 WRA Data Request 2.1 During the October 11,2017 Technical Conference held in Salt Lake City,Rick Link stated that his team's modeling demonstrates that output from Wyodak and Dave Johnston would increase and the output from Jim Bridger decline as a result of the Combined Projects (1240 MW of new wind plus 140 mile 500 kV transmission line plus the 230 kV Network Upgrades).Attachment OCS 1.31 -2 CONF.xlsx displays this incremental output for Wyodak and Dave Johnston -specifically,the attachment displays the GWh of increased generationin the case of new wind and transmission as compared with wind repowering only for the years 2017 -2036. (a)Reproduce Attachment OCS 1.31 -2 CONF.xlsx using current assumptions and modeling parameters (if not previously used)but include generationdata for the Jim Bridger plant.Display results using unit data level data. (b)Does the additional transmission impact the dispatch of PacifiCorp's share of either the Craig or Hayden plants?If so,include generation from Craig and Hayden in the reproduction of OCS1.31 -2 CONF.xlsx.Provide unit level data. (c)Do the Combined Projects impact the dispatch of the Hunter and Huntingtonunits?If so,include generation from Hunter and Huntingtonin the reproduction of OCSl.31 -2 CONF.xlsx.Provide unit level data. (d)Do the Combined Projects impact the dispatch of PacifiCorp's share of Colstrip?If so,include Colstrip in the reproduction of OCSl.31 -2 CONF.xlsx.Provide unit level data. Response to WRA Data Request 2.1 (a)The Company has not performed updated economic analysis for the transmission project and new wind using current assumptions and modeling parameters.Consistent with the procedural schedule in this docket,the Company will update its economic analysis in its supplemental filing in mid-January 2018. (b)The additional transmission impact on the dispatch of PacifiCorp's share of either the Craig or Hayden plants cannot be isolated as the study includes the proposed new transmission project and new wind facilities.Please refer to the Company's response to subpart (a)above. (c)Please refer to Confidential Attachment WRA 2.1-1. (d)Please refer to Confidential Attachment WRA 2.1-2. Confidential information is provided subject to Public Service Commission of Utah Rules 746-1-602 and 603. 17-035-39 /Rocky Mountain Power November 21,2017 WRA Data Request 2.2 WRA Data Request 2.2 The 2017 IRP states that PacifiCorp intends to retire the four Dave Johnston units by end of 2027 -the end of their depreciable lives in all states but Oregon.Presumably,all else equal, these retirements would lower the "stiffness factor"in eastern Wyoming and could lead to voltage control issues whether or not PacifiCorp proceeds with the Combined Projects. a)What steps has PacifiCorp taken to address the potential voltage control problems that could arise with the retirement of these units?Describe in detail the options the Company has considered.What elements of the 230 kV Network Upgrades,if any, would be needed assuming no new wind?Provide options,studies,timelines,etc. b)If the Combined Projects are approved,what additional transmission enhancements,if any,will be needed to provide voltage control and maintain reliable operations following the retirement of the four units at Dave Johnston,wheneverthey occur? c)Assume Dave Johnston Units 1 and 3 are retired by the end of 2020 but no new wind is added.Describe in detail the transmission enhancements,if any,that would be necessary to provide voltage control and maintain reliable operations. d)Assume Dave Johnston Units 1 and 3 are retired by the end of 2020 and approximately 1000 MW of new wind is added.What enhancements,if any,in addition to those identified in "c"above would be needed? Response to WRA Data Request 2.2 a)The more recent 2017 studies,which are underway,will evaluate the Dave Johnston Plant retirement impacts to new Wyoming wind generationintegration.These study findings will be available for release upon request to stakeholders and state commissions by year end. b)While voltage control,includingdynamic and static devices,is being evaluated as part of study efforts to integrate the Combined Projects with the current Wyoming transmission system,no detailed studies have been performed to evaluate additional transmission enhancements needed to provide voltage control and maintain reliable operations followingthe retirement of the four units at the Dave Johnston Plant -followingthe implementation of the Combined Projects. c)No detailed technical studies have been performed to evaluate the impacts of the Dave Johnston Units 1 and 3 retirement on the Wyoming transmission system. d)No detailed technical studies have been performed to evaluate the impacts of the Dave Johnston Units 1 and 3 retirement on the Wyoming transmission system.