20251229Compliance Filing.pdf

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LISA C. LANCE RECEIVED
Corporate Counsel DECEMBER 29, 2025
Ilance(Widahopower.com IDAHO PUBLIC
UTILITIES COMMISSION
December 29, 2025
Commission Secretary
Idaho Public Utilities Commission
11331 W. Chinden Boulevard
Building 8, Suite 201-A
Boise, Idaho 83714
Re: Case No. IPC-E-25-33
Idaho Power Company's Annual Compliance Filing to Update the Load and
Gas Forecast in the Incremental Cost Integrated Resource Plan Avoided Cost
Model
Dear Commission Secretary:
Attached for electronic filing is Idaho Power Company's Compliance Filing in the
above-entitled matter. If you have any questions about the attached documents, please
do not hesitate to contact me.
Attachment No. 1 to the Annual Compliance Filing is confidential. Please handle the
confidential information in accordance with the Protective Agreement to be executed in
this matter.
Sincerely,
Lisa C. Lance
LCL:cd
Attachments
1221 W. Idaho St(83702)
P.O. Box 70
Boise, ID 83707

LISA C. LANCE (ISB No. 6241)
DONOVAN E. WALKER (ISB No. 5921)
Idaho Power Company
1221 West Idaho Street (83702)
P.O. Box 70
Boise, Idaho 83707
Telephone: [phone]
Facsimile: [phone]
Ilance(a-Mdahopower.com
dwalkerCa-)_idahopower.com
Attorneys for Idaho Power Company
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IDAHO POWER COMPANY'S ANNUAL )
COMPLIANCE FILING TO UPDATE THE ) CASE NO. IPC-E-25-33
LOAD AND GAS FORECASTS IN THE )
INCREMENTAL COST INTEGRATED ) IDAHO POWER COMPANY'S
RESOURCE PLAN AVOIDED COST ) COMPLIANCE FILING
MODEL. )
Idaho Power Company ("Idaho Power" or "Company") hereby respectfully submits
to the Idaho Public Utilities Commission ("Commission") the accompanying natural gas
forecast and Peak and Premium Peak Hours submittal in compliance with Final Order No.
36885 in the above-captioned case.
I. INTRODUCTION AND BACKGROUND
On October 15, 2025, Idaho Power filed its annual Compliance Filing to update the
load forecast and natural gas forecast components of the Incremental Cost Integrated
Resource Plan ("ICIRP") avoided cost methodology, as well as the long-term contract
changes and the Peak and Premium Peak Hours used to calculate capacity payments for
energy storage Public Utility Regulatory Policies Act of 1978 qualifying facilities ("QF").
IDAHO POWER COMPANY'S COMPLIANCE FILING - 1

On December 23, 2025, the Commission issued Order No. 36885, approving the
Company's update to its load forecast and contract changes as filed. However, the
Commission declined to adopt the Company's proposed natural gas price forecast and
directed the Company to submit, as a compliance filing, the updated load forecast using
the alternative forecast developed by Staff. Additionally, the Commission approved the
Peak and Premium Peak Hours identified in Staff's Table No. 2, which are provided as
Attachment 2 to this compliance filing for clarity of the record.
II. THE FILING
Pursuant to the Commission's direction in Order No. 36885, and consistent with
the method directed in Orders No. 35344 and 36434, Idaho Power provides herewith as
CONFIDENTIAL Attachment 1 a revised natural gas price forecast as follows: (1) using
NYMEX forwards prices as of October 15, 2025, for years 2026, 2027, and 2028 of the
20-year forecast; (2) using an average of the October 15, 2025 NYMEX forwards prices
and August 2025 vintage Platts forecast for year 2029 of its forecast; and (3) using the
August 2025 vintage Platts forecast for the remaining years of the forecast (years 2030-
2045). Additionally, the Peak and Premium Peak Hours approved by the Commission in
Staff's Table No. 2 are provided as Attachment 2 to this compliance filing.
III. REQUEST FOR RELIEF
Idaho Power respectfully requests that the Commission accept the revised natural
gas forecast in compliance with the Commission's directive in Order No. 36885.
Respectfully submitted this 29th day of December 2025.
LISA C. LANCE
Attorney for Idaho Power Company
IDAHO POWER COMPANY'S COMPLIANCE FILING - 2

CERTIFICATE OF SERVICE
I HEREBY CERTIFY that on this 29th day of December 2025, 1 served a true and
correct copy of the within and foregoing IDAHO POWER COMPANY'S COMPLIANCE
FILING upon the following named parties by the method indicated below, and addressed
to the following:
Adam Triplett Hand Delivered
Deputy Attorneys General U.S. Mail
Idaho Public Utilities Commission Overnight Mail
P.O. Box 83720 FAX
Boise, ID 83720-0074 X Email - adam.triplett(a)_puc.idaho.gov
a4DU4--
Christy Davenport, Legal Assistant
IDAHO POWER COMPANY'S COMPLIANCE FILING - 3

BEFORE THE
IDAHO PUBLIC UTILITIES COMMISSION
CASE NO. IPC-E-25-33
IDAHO POWER COMPANY
ATTACHMENT NO. 1

ATTACHMENT 1
IS CONFIDENTIAL AND WILL BE PROVIDED TO THOSE PARTIES THAT EXECUTE
THE PROTECTIVE AGREEMENT IN THIS MATTER

BEFORE THE
IDAHO PUBLIC UTILITIES COMMISSION
CASE NO. IPC-E-25-33
IDAHO POWER COMPANY
ATTACHMENT NO. 2

Attachment 2
Peak Hours and Premium Peak Hours
Summer Peak Hours June 15 to September 15 excluding Sundays and holidays:
3:00 pm to 11:00 pm
Summer Premium June 15 to September 15 excluding Sundays and holidays:
Peak Hours 6:00 pm to 11:00 pm
Winter Peak Hours November 15 to February 15 excluding Sundays and holidays:
5:00 am to 10:00 am and 4:00 pm to 10:00 pm
Winter Premium Peak November 15 to February 15 excluding Sundays and holidays:
Hours 6:00 am to 9:00 am and 5:00 pm to 8:00 pm