20261002Exhibit D - Schedule 66 Tariff.pdf

Twenty-Ninth Revision Sheet 66
Canceling
I.P.U.C. No.28 Twenty-Eighth Revision Sheet 66
AVISTA CORPORATION
d/b/a Avista Utilities
SCHEDULE 66
TEMPORARY POWER COST ADJUSTMENT - IDAHO
APPLICABLE:
To Customers in the State of Idaho where the Company has electric service
available. This Power Cost Adjustment shall be applicable to all retail customers for
charges for electric energy sold. This Rate Adjustment is designed to recover or
rebate a portion of the difference between actual and allowed net power supply costs.
MONTHLY RATE:
The energy charges of electric Schedules 1, 11, 12, 21, 22, 25, 31, 32, and 42-49
are to be increased by 0.1570 per kilowatt-hour in all blocks of these rate schedules.
The energy charge of electric Schedule 25P is to be increased by 0.0650 per kilowatt-
hour in all blocks of this rate schedule.
SPECIAL TERMS AND CONDITIONS:
The rates set forth under this Schedule are subject to periodic review and
adjustment by the IPUC based on the actual balance of deferred power costs.
Service under this schedule is subject to the Rules and Regulations contained
in this tariff.
The above Rate is subject to increases as set forth in Tax Adjustment
Schedule 58.
Issued October 2, 2026 Effective January 1, 2027
Issued by Avista Utilities
By Patrick Ehrbar— Director of Regulatory Affairs