IDACORP INC - Form 8-K Summary
Business Context and Reporting Period
This Current Report (Form 8-K) dated December 30, 2025, concerns IDACORP, Inc. and its subsidiary, Idaho Power Company. The filing reports the approval of a settlement stipulation regarding a general rate case (Case No. IPC-E-25-16) by the Idaho Public Utilities Commission (IPUC).
Key Financial Metrics and Terms
- Revenue Impact: Revised tariff schedules will increase annual Idaho-jurisdictional retail revenue by approximately $110.0 million (7.48 percent), effective January 1, 2026. This includes a $13.1 million increase from the Power Cost Adjustment (PCA).
- Rate of Return: A 9.6 percent return on equity (ROE) and a 7.410 percent authorized rate of return based on the filed cost of debt and capital structure.
- Rate Base: Approximately $4.9 billion, based on the average of monthly average plant balances for January through December 2025.
- Net Power Supply Expense (NPSE): A base level of approximately $468.8 million, representing a $16.1 million decrease from the currently approved base level.
- Accumulated Deferred Investment Tax Credits (ADITC): An annual cap of $55 million on accelerated amortization for calendar year 2026 and thereafter.
Material Changes and Regulatory Actions
The IPUC issued an order on December 30, 2025, approving the Settlement Stipulation entered into by Idaho Power, the IPUC Staff, and intervening parties. Key changes include:
- Implementation of new tariff schedules effective January 1, 2026.
- Continued deferral of certain wildfire mitigation costs (incremental vegetation management and insurance) measured from 2024 actual costs through the earlier of the next general rate case or 2027.
- Inclusion of Idaho Power's share of capital expenditures at jointly-owned coal-fired plants through year-end 2024 in the stipulated revenue requirement.
- Updates to fixed cost adjustment mechanism rates.
Outlook, Risks, and Management Commentary
The Settlement Stipulation does not include a tracking mechanism for incremental depreciation and interest expense that Idaho Power had requested. The IPUC Staff completed its prudence review of capital projects through July 2025; investments placed in service after July 2025 will be addressed in the next general rate case. The Order does not preclude Idaho Power from filing another general rate case in the future. The filing text does not provide specific guidance on future earnings, cash flow, or debt levels beyond the rate case terms.
Key Facts for Investor Verification
- Verify the effective date of the new tariff schedules (January 1, 2026) and the specific impact on customer rates.
- Confirm the $110.0 million revenue increase and the $16.1 million reduction in base NPSE.
- Review the terms of the ADITC mechanism, specifically the $55 million annual cap on accelerated amortization.
- Monitor the status of deferred wildfire mitigation costs and the timeline for their recovery.
- Check for future filings regarding capital projects placed in service after July 2025, as these were not included in the current prudence review.