8-K: Idaho Power Settles Rate Case for $110M Revenue Boost

Idaho Power Company has reached a settlement stipulation with the IPUC for a 7.48% annual revenue increase, effective January 1, 2026.

Summary

• Idaho Power Company initially filed a general rate case on May 30, 2025, requesting approximately $199.1 million in additional Idaho-jurisdiction annual revenues, aiming for a 13.09% overall average net increase.
• The initial request included an authorized return on equity (ROE) of 10.4% and an Idaho retail rate base of approximately $5.1 billion.
• On October 24, 2025, Idaho Power filed a motion for approval of a settlement stipulation with the Idaho Public Utilities Commission (IPUC) and several intervening parties.
• If approved, the settlement will authorize an increase in annual Idaho-jurisdictional retail revenue by approximately $110.0 million, or 7.48%, effective January 1, 2026.
• The approved ROE under the settlement is 9.6%, and the authorized rate of return is 7.410%, applied to an Idaho-jurisdictional rate base of approximately $4.9 billion.
• The settlement also includes a decrease of $16.1 million in the base level net power supply expense (NPSE) to approximately $468.8 million.
• Key terms include continued deferral of certain wildfire mitigation costs and modifications to the accumulated deferred investment tax credits (ADITC) and revenue sharing mechanism, including an annual cap of $55 million on accelerated amortization of ADITCs.
• 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.

Sentiment

Score: 6

Explanation: While the approved rate increase is lower than initially requested, securing a $110 million revenue increase and a 9.6% ROE provides regulatory certainty and a reasonable return for a regulated utility. The settlement avoids the uncertainty and potential for a worse outcome of a full litigation process.

Positives

• Secured an approximate $110.0 million increase in annual Idaho-jurisdictional retail revenue, representing a 7.48% increase, effective January 1, 2026.
• Achieved a 9.6% authorized return on equity (ROE), providing a stable return for investors.
• Inclusion of Idaho Power's share of capital expenditures at jointly-owned coal-fired plants through year-end 2024 for recovery in the stipulated revenue requirement.
• Continued deferral of certain wildfire mitigation related costs, including incremental vegetation management and insurance costs, through the earlier of the next general rate case or 2027.
• The settlement provides regulatory certainty for a significant portion of the requested rate adjustment, avoiding prolonged litigation.

Negatives

• The approved annual revenue increase of $110.0 million is significantly lower than the initially requested $199.1 million.
• The authorized return on equity (ROE) of 9.6% is lower than the initially requested 10.4%.
• The approved Idaho-jurisdictional rate base of approximately $4.9 billion is lower than the initially requested $5.1 billion.
• The settlement includes an annual cap of $55 million on the accelerated amortization of accumulated deferred investment tax credits (ADITCs) for calendar year 2026 and thereafter.

Risks

• Decisions or actions by the IPUC and the Federal Energy Regulatory Commission (FERC) could impact Idaho Power's ability to recover costs and earn a return on investment.
• Changes to or the elimination of Idaho Power's regulatory cost recovery mechanisms.
• Regulatory decisions could negatively impact credit ratings and investor perceptions, affecting IDACORP's and Idaho Power's ability to obtain debt and equity financing on reasonable terms.
• Changes in tax laws, regulations, or interpretations, as well as the availability of expected tax credits or other tax benefits, could adversely affect financial performance.
• IDACORP's ability to pay dividends to shareholders is dependent on actual cash collections through authorized customer rates.
• The IPUC's determination on the settlement stipulation is pending, and there is no guarantee of approval or that terms will not be materially changed.

Future Outlook

Idaho Power anticipates that new rates, if approved by the IPUC, would become effective on or after January 1, 2026. The company acknowledges that the IPUC's determination is pending and cannot predict the outcome of the general rate case. The settlement does not prevent Idaho Power from filing another general rate case in the future.

Management Comments

• 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.

Industry Context

This filing reflects a common practice in the regulated utility industry where companies periodically seek rate adjustments to recover costs, fund infrastructure investments, and earn a fair return on equity. The settlement process, involving regulatory staff and intervening parties, is typical for balancing utility financial health with consumer interests. The focus on wildfire mitigation costs and investment tax credits highlights ongoing industry challenges and regulatory mechanisms to address them. The reduction from the initial request to the settlement amount is also a common outcome in such negotiations, indicating the balancing act regulators perform.

Comparison to Industry Standards

• The authorized Return on Equity (ROE) of 9.6% for Idaho Power is within the typical range for regulated electric utilities in the U.S., which often falls between 9% and 10.5%. For example, recent authorized ROEs for utilities like Duke Energy (various jurisdictions) or Southern Company subsidiaries have generally been in this range, reflecting a balance between investor returns and consumer rates.
• The rate base of approximately $4.9 billion for Idaho-jurisdictional operations is specific to Idaho Power's asset portfolio and service territory. Direct comparisons to other utilities would require detailed analysis of their respective rate bases, which are highly dependent on size, infrastructure, and regulatory jurisdiction.
• The inclusion of wildfire mitigation costs and mechanisms for investment tax credits are standard practices across the utility industry, particularly in regions prone to wildfires or where significant capital investments are being made in renewable energy or grid modernization. Companies like Pacific Gas and Electric (PG&E) in California have extensive wildfire mitigation programs and cost recovery mechanisms due to high risk.

Stakeholder Impact

• Shareholders: Will benefit from the approved revenue increase and a stable 9.6% ROE, providing predictable earnings, though lower than initially sought. The regulatory certainty from the settlement is also positive.
• Customers: Will face a 7.48% average net Idaho-jurisdictional revenue increase, which is lower than the initially proposed 13.09% increase, mitigating the impact on their bills.
• Regulators (IPUC): The settlement stipulation indicates a collaborative outcome between Idaho Power, IPUC Staff, and intervening parties, suggesting a balanced approach to regulatory oversight.

Next Steps

• IPUC determination on the settlement stipulation is pending.
• If approved, new rates are anticipated to become effective on or after January 1, 2026.
• IPUC Staff will address potential prudence concerns with investments after July 2025 in Idaho Power's next Idaho general rate case.
• Idaho Power may file another general rate case in Idaho at any time in the future.

Key Dates

Recommendation

The settlement provides regulatory clarity and a reasonable, albeit lower than requested, rate increase and ROE. This outcome is generally positive for a regulated utility, ensuring stable cash flows and returns. However, the reduction from the initial request suggests some pressure, and the stock is likely to reflect this balanced outcome rather than a significant upside surprise. Investors should hold, awaiting the final IPUC approval and monitoring future capital expenditure plans and regulatory environments.

Keywords

Idaho Power, IDACORP, Rate Case, IPUC, Utility Regulation, Revenue Increase, Return on Equity, Rate Base, Wildfire Mitigation, Investment Tax Credits, Energy Sector, Public Utilities