20260424Updated Supplemental Workpapers.pdf

_ ROCKY MOUNTAIN 1407 West North Temple, Suite 330
POWER. Salt Lake City, Utah 84116
A DIVISION OF PACIFICORP
April 24, 2026
RECEIVED
VIA ELECTRONIC FILING APRIL 24, 2026
IDAHO PUBLIC
Commission Secretary UTILITIES COMMISSION
Idaho Public Utilities Commission
11331 W. Chinden Blvd
Building 8 Suite 201A
Boise, Idaho 83714
RE: CASE NO. PAC-E-25-12 -PACIFICORP'S APPLICATION FOR
ACKNOWLEDGEMENT OF THE 2025 INTEGRATED RESOURCE PLAN
Attention: Commission Secretary
PacifiCorp ("Rocky Mountain Power" or"Company") hereby submits additional workpapers
regarding stochastic analysis to assist in the review of the 2025 Integrated Resource Plan Update
("2025 IRP Update").
Also included are corrected short-term cost summary workpapers previously filed on April 10,
2026. A list of corrected workpapers is included in the filed materials.
The 2025 IRP Update public workpapers are available electronically on PacifiCorp's website, at
www.pacificop2.com/iM.
Confidential information in the workpapers will be available to state regulators and any party
who have intervened in this case and signed a non-disclosure agreement. PacifiCorp requests that
interested parties contact the Company for a copy of the non-disclosure agreement that must be
executed and submitted prior to obtaining a copy of the confidential information.
All formal correspondence and data requests regarding this filing should be addressed as follows:
By E-mail (preferred): datarequest(&,pacificorp.com
irp(cr�,pacificorp.com
j ana.sabakl2acificorp.com
j oseph.dallaskpacificorp.com
By regular mail: Data Request Response Center
PacifiCorp
825 NE Multnomah, Suite 2000
Portland, OR 97232

Idaho Public Utilities Commission
April 24, 2026
Page 2
Informal inquiries related to the workpapers may be directed to Jana Saba, Director Regulation
and Regulatory Operations, at(801) 220-2823.
Sincerely,
oelle Stewd
Senior Vice President of Regulation
Enclosures
cc: Jamie Neill, Idaho Governor's Office
Richard Stover, Idaho Governor's Office
Brad Heusinkveld, Idaho Conservation League
Mitch Colburn, Idaho Power Company
Donn English, Idaho Public Utilities Commission staff
Thomas J. Budge, Bayer
Nancy Kelly, Western Resource Advocates
Eric Olsen, Idaho Irrigation Pumpers Association