20240927PAC to Staff 230 - 2nd Supplemental.pdf

RECEIVED
Friday, September 27, 2024
IDAHO PUBLIC
UTILITIES COMMISSION
_ ROCKY MOUNTAIN
POWER
A DIVISION OF PACIFICORP
1407 W North Temple, Suite 330
Salt Lake City, Utah 84116
September 27, 2024
Monica Barrios-Sanchez
Commission Secretary
Idaho Public Utilities Commission
11331 W. Chinden Blvd.
Bldg. 8, Ste. 201-A
Boise, ID 83714
monica.barrio ssanchez(apuc.Idaho.gov
S ecretarygpuc.idaho.gov
RE: ID PAC-E-24-04
IPUC Set 12 (217-240)
Please find enclosed Rocky Mountain Power's 2nd Supplemental Response to IPUC 121h Set Data
Request 230. Also provided is Attachment IPUC 230 2nd Supplemental.
If you have any questions, please feel free to call me at(801)220-2313.
Sincerely,
/s/
Mark Alder
Manager, Regulation
Enclosures
C.c.: Eric L. Olsen/IIPA elokechohawk.com(C)
Lance Kaufman/IIPA lance(&aegisinsi hg t.com(C)
Matthew Nykiel/ICL matthew.nykiel&gmail.com
Brad Heusinkveld/ICL bheusinkveld(&idahoconservation.org
Thomas J. Budge/Bayer tj racineolson.com(C)
Brian C. Collins/Bayer bcollins(cr�,consultbai.com
Greg Meyer/Bayer gmeyerkconsultbai.com
Kevin Higgins/Bayer khiggins(&energystrat.com(C)
Neal Townsend/Bayer ntownsend(a,energystrat.com (C)
Ronald L. Williams/PIIC rwilliams(&hawleytroxell.com
Brandon Helgeson/PIIC bhel eg sonkhawleytroxell.com
Bradley Mullins/PIIC brmullins&mwanal)tics.com
Val Steiner/PIIC val.steiner(&itafos.com
Kyle Williams/PIIC williamskkbyui.edu

PAC-E-24-04/Rocky Mountain Power
September 27, 2024
IPUC Data Request 230—2nd Supplemental
IPUC Data Request 230
Please re-run Aurora model and provide updated work paper
"ID—GRC-2025-2023 Normalized Load.xlsm" and updated McCoy's work paper
"5.1 —NPC.xlsx" to reflect the result of each scenario below:
Scenario Modifications
1 • Remove the CCA allowance cost from the dispatch cost of the Chehalis plant
in the Aurora model;and
• Remove the post-modeling CCA costs',which were calculated based on the
multiplication of Chehalis's generation amounts and the CCA allowance cost.
2 • Use the official forward price curve(OFPC)dated on June 28,2024,from
Response to Production Request No. 107 in the Aurora model;
• Remove the CCA allowance cost from the dispatch cost of the Chehalis plant
in the Aurora model;and
• Remove the post-modeling CCA costs,which were calculated based on the
multiplication of Chehalis's generation amounts and the CCA allowance cost.
3 • Use the OFPC dated on June 28,2024,from Response to Production Request
No. 107 in the Aurora model;
• Remove the CCA allowance cost from the dispatch cost of the Chehalis plant
in the Aurora model;
• Remove the post-modeling CCA costs,which were calculated based on the
multiplication of Chehalis's generation amounts and the CCA allowance cost.
• Production Request No. 184(e).
4 • Use the OFPC dated on June 28,2024,from Response to Production Request
No. 107 in the Aurora model;
• Remove the CCA allowance cost from the dispatch cost of the Chehalis plant
in the Aurora model;and
• Remove the post-modeling CCA costs,which were calculated based on the
multiplication of Chehalis's generation amounts and the CCA allowance cost.
• Production Request No. 185(f).
5 • Use the OFPC dated on June 28,2024,from Response to Production Request
No. 107 in the Aurora model;
• Remove the CCA allowance cost from the dispatch cost of the Chehalis plant
in the Aurora model;and
• Remove the post-modeling CCA costs,which were calculated based on the
multiplication of Chehalis's generation amounts and the CCA allowance cost.
9 Production Request No. 186.

PAC-E-24-04/Rocky Mountain Power
September 27, 2024
IPUC Data Request 230—2nd Supplemental
2nd Supplemental Response to IPUC Data Request 230
The Company continues to object to this request as unduly burdensome,
requesting the creation of a new analysis or report, and not reasonably calculated
to lead to the discovery of admissible evidence. Without waiving the foregoing
objection, the Company responds as follows:
Further to the Company's prior responses to IPUC Data Request 230, the
Company provides the following additional information:
Please refer to Attachment IPUC 230 2nd Supplemental which provides the
updated work paper"5.1 —NPC.xlsx"based on scenario 1 and 2.
Recordholder: Nick Highsmith
Sponsor: Shelley McCoy