20260410IRP Update Workpapers.pdf

_ ROCKY MOUNTAIN
POWER. 1407 West North Temple, Suite 330
A DIVISION OF PACIFICORP Salt Lake City, Utah 84116
April 10, 2026 RECEIVED
APRIL 10, 2026
IDAHO PUBLIC
VIA ELECTRONIC DELIVERY UTILITIES COMMISSION
Commission Secretary
Idaho Public Utilities Commission
11331 W. Chinden Blvd.
Building 8 Suite 201A
Boise, Idaho 83714
RE: CASE NO. PAC-E-25-12 - PacifiCorp's 2025 Integrated Resource Plan Update
Attention: Commission Secretary
PacifiCorp ("Rocky Mountain Power" or the "Company") hereby submits the supporting
workpapers for the analyses included in the 2025 Integrated Resource Plan Update("IRP Update")
filed on March 31, 2026.
The public and confidential workpapers include model input and results, and support for tables
and figures organized by chapter and appendix. This includes materials for all studies,variants and
sensitivities included in the 2025 IRP Update.
The 2025 IRP Update public workpapers are available electronically on PacifiCorp's("Company")
website, at www.pacificop2.com/ip2.
Confidential information in the workpapers will be available to state regulators and any parry who
has intervened in this case and signed a non-disclosure agreement. PacifiCorp requests that
interested parties contact the state manager listed below for a copy of the non-disclosure agreement
that must be executed and submitted prior to obtaining a copy of the confidential information.
Informal inquiries related to the workpapers may be directed to Jana Saba,Director of Regulation,
at(801) 220-2823
Sincerely,
Joelle Stewar
Senior Vice President, Regulation
Enclosures

Idaho Public Utilities Commission
April 10, 2026
Page 2
Cc: Jamie Neill, Idaho Governor's Office
Richard Stover, Idaho Governor's Office
Brad Heusinkveld, Idaho Conservation League
Mitch Colburn, Idaho Power Company
Jeff Loll, Idaho Public Utilities Commission, Deputy Attorney General
Donn English, Idaho Public Utilities Commission staff
Thomas J. Budge, Bayer
Nancy Kelly, Western Resource Advocates
Eric Olsen, Idaho Irrigation Pumpers Association