Idacorp Inc.
10/24/2025 | Press release | Distributed by Public on 10/24/2025 14:14
Material Event (Form 8-K)
Item 8.01 Other Events.
As previously reported, on May 30, 2025, Idaho Power Company (Idaho Power) filed a general rate case and proposed rate schedules with the Idaho Public Utilities Commission (IPUC), Case No. IPC-E-25-16. The filing was based on a 2025 test year and requested approximately $199.1 million in additional Idaho-jurisdiction annual revenues, which is net of a $46.8 million Idaho-jurisdiction power cost adjustment (PCA) decrease. As filed, this request would have resulted in a 13.09 percent overall average net Idaho-jurisdictional revenue increase for Idaho Power's Idaho customers. The filing requested, among other items, an authorized rate of return on equity of 10.4 percent with an Idaho retail rate base of approximately $5.1 billion, which is not inclusive of rate base associated with Idaho Power's jointly-owned coal facilities, the costs of which are recovered under separate rate mechanisms. In its application, Idaho Power proposed a capitalization structure of approximately 49 percent long-term debt and 51 percent common stock equity. Idaho Power included an average cost of debt of 5.132 percent and an overall cost of capital of 7.818 percent.
On October 24, 2025, Idaho Power filed a motion for approval of a settlement stipulation (Settlement Stipulation) with the IPUC related to the Idaho general rate case filing. The Settlement Stipulation was entered into by Idaho Power, the Staff of the IPUC, and several of the intervening parties. If the IPUC approves the Settlement Stipulation, it will authorize Idaho Power's filed general rate case, with the modifications contained in the Settlement Stipulation.
The Settlement Stipulation contains the following significant terms, among other items:
•Idaho Power would implement revised tariff schedules designed to increase annual Idaho-jurisdictional retail revenue by approximately $110.0 million, or 7.48 percent, effective January 1, 2026. The approximate $110 million of additional annual revenue is inclusive of a PCA rate increase of $13.1 million;
•a 9.6 percent return on equity and a 7.410 percent authorized rate of return based on the filed cost of debt and capital structure, applied to an Idaho-jurisdictional rate base of approximately $4.9 billion (which is based on the average of monthly average plant balances for January through December 2025);
•a base level net power supply expense (NPSE) of approximately $468.8 million, a decrease of $16.1 million from the currently approved base level NPSE;
•updates to the Idaho fixed cost adjustment mechanism rates to reflect approved fixed costs and Idaho Power's proposed rate designs;
•continued deferral of certain wildfire mitigation related costs, including incremental vegetation management and insurance costs, as measured from 2024 actual costs, through the earlier of Idaho Power's next general rate case or 2027;
•modifications to Idaho Power's accumulated deferred investment tax credits (ADITC) and revenue sharing mechanism: (1) to include an additional amount of investment tax credits equal to the total of existing ADITCs not currently eligible for accelerated amortization under the mechanism and all investment tax credits generated through the end of calendar-year 2028; (2) to establish an annual cap of $55 million on the amount of accelerated amortization of ADITCs for calendar year 2026 and thereafter; (3) to re-affirm the existing minimum specified Idaho-jurisdiction return on year-end equity (Idaho ROE) of 9.12 percent for additional amortization of ADITCs; (4) to re-affirm the existing 9.6 percent Idaho ROE as the threshold for revenue sharing of Idaho-jurisdiction earnings between Idaho Power and Idaho customers; and (5) to continue to implement all revenue sharing through the PCA; and
•agreement that Idaho Power's share of capital expenditures at jointly-owned coal-fired plants through year-end 2024 are included for recovery in the stipulated revenue requirement.
At the time of the Settlement Stipulation, Staff of the IPUC had completed its prudence review of capital projects included in the test year rate base through July 2025. To the extent IPUC Staff identifies potential prudence concerns with investments after July 2025, it will address those in Idaho Power's next Idaho general rate case.
The Settlement Stipulation does not preclude Idaho Power from filing another general rate case in Idaho at any time in the future. If the IPUC were to deny the Settlement Stipulation or materially change its terms, no party would be bound by the terms of the Settlement Stipulation. As of the date of this report, the IPUC's determination in this matter is pending.
Idaho Power is unable to predict the outcome of the general rate case. Idaho Power anticipates that new rates, if approved by the IPUC, would become effective on or after January 1, 2026.
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