20260312Decision Memo.pdf

DECISION MEMORANDUM
TO: COMMISSIONER LODGE
COMMISSIONER HAMMOND
COMMISSIONER HARDIE
COMMISSION SECRETARY
COMMISSION STAFF
LEGAL
FROM: YAO YIN, COMMISSION STAFF
JEFF LOLL,DEPUTY ATTORNEY GENERAL
DATE: MARCH 12, 2026
RE: IN THE MATTER OF IDAHO POWER COMPANY'S APPLICATION
FOR AUTHORITY TO UPDATE ITS OPERATION AND
MAINTENANCE CHARGES APPLICABLE TO SCHEDULE 72,
GENERATOR INTERCONNECTIONS TO PURPA QUALIFYING
FACILITY SELLERS; CASE NO. IPC-E-25-22.
BACKGROUND
On December 31, 2025, the Idaho Public Utilities Commission ("Commission") issued
Order No. 36894, directing Idaho Power Company ("Company") to calculate the transmission
Operation and Maintenance("O&M") charge in Schedule 72 based on an average weighted by the
percentage of qualifying facility interconnection capacity connected at each voltage level of 138
kilovolt and above as of December 31, 2024.
On February 27, 2026, the Company filed a compliance filing to meet this requirement
without updating the transmission O&M charge in Schedule 72, because the resulting rate is the
same as the one approved under the prior methodology.
STAFF REVIEW
Staff reviewed the Company's compliance filing and verified that the Company followed
the Commission's direction to calculate the transmission O&M charge using the voltage-based
method required in Order No. 36894. In the calculation, the disaggregation of total transmission
lines plant investment by voltage level serves as the basis for allocating O&M labor, general plant,
and administrative and general expenses to each voltage level. Therefore, the allocation of O&M
DECISION MEMORANDUM - I - MARCH 12, 2026

related costs scales proportionally with the plant investment assigned to each voltage level,leading
to the same O&M charge for each voltage level. As a result, the weighted-average transmission
O&M charge remains the same as the current one approved using the prior methodology.
Since the new rate is the same as the currently approved one, Staff agrees with the
Company that Schedule 72 does not need any revision.
STAFF RECOMMENDATION
Staff recommends that the Commission approve the Company's compliance filing filed on
February 27, 2026, without requiring Schedule 72 to be updated.
COMMISSION DECISION
Does the Commission wish to approve the Company's compliance filing filed on February
27, 2026, without requiring Schedule 72 to be updated?
_J�_ 19
Yao Yin
Utilities Analyst II
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DECISION MEMORANDUM - 2 - MARCH 12, 2026