20200115PAC to IIPA WY 200000-539-EA-18 WIEC Set 3 (1).pdf

1407 W North Temple, Suite 330 Salt Lake City, Utah 84116 October 31, 2019 Abigail C. Briggerman, #7-5476
Holland & Hart LLP
6380 South Fiddlers Green Circle, Suite 500 Greenwood Village, CO 80111 [e-mail]
RE: Wyoming Docket 20000-539-EA-18
WIEC 3rd Set Data Request (1) Please find enclosed Rocky Mountain Power’s Response to WIEC 3rd Set Data Request 3.1. Also provided are Attachments WIEC 3.1 –(1-2).

If you have any questions, please call me at [phone]. Sincerely,

_____/s/_________ Stacy Splittstoesser, Manager, Regulation
Enclosure
C.c: Christopher Leger/OCA [e-mail] (C) Thor Nelson/WIEC [e-mail] (W) Michelle King/WIEC [e-mail] (W) Hannah Oakes/WIEC [e-mail] (W)
Adele Lee/WIEC [e-mail] (W)
Gina Gargano-Amari/WIEC [e-mail] (W)
20000-539-EA-18 / Rocky Mountain Power October 31, 2019
WIEC Data Request 3.1 WIEC Data Request 3.1 Please provide any updates the Company has made to the 2018 Depreciation Study based
on the results of the 2019 Integrated Resource Plan and final Preferred Portfolio. Please also provide copies of all workpapers which were used to develop, or which support, these updates in native format with all cells and formulae intact. To the extent that such workpapers exist in paper form only, please provide paper copies.
Response to WIEC Data Request 3.1 Please refer to Attachment WIEC 3.1-1 which shows the change from the depreciation study submitted in this docket if the coal plant lives in the 2019 Integrated Resource Plan (IRP) preferred portfolio were adopted for depreciation. The IRP preferred portfolio
identifies the retirement date of Cholla plant to be 2020. The IRP action plan allows for a retirement date no later than 2023. For the purpose of analyzing depreciation changes for this data request, a 2022 retirement date is assumed for Cholla plant. The IRP preferred portfolio includes the conversion of Naughton unit 3 to natural gas in 2020, whereas the depreciation case reflected Naughton unit 3 as being retired in 2019. Please note that the
Company has not formally offered these changes to its filed position in the depreciation case but are providing them to parties for discussion purposes. Please refer to Attachment WIEC 3.1-2 for the work papers supporting the schedule of depreciation changes.
Respondent: Kent Ipson
Witness: To Be Determined