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INCOME TAXES:
 3 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
 
In accordance with interim reporting requirements, IDACORP and Idaho Power use an estimated annual effective tax rate for computing their provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual effective tax rate is applied to year-to-date pre-tax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period's year-to-date amount.
Income Tax Expense

The following table provides a summary of income tax benefit for the three months ended March 31, 2025 and 2024 (in thousands): 
 IDACORPIdaho Power
 2025202420252024
Income tax at statutory rates (federal and state)$11,809 $10,972 $11,381 $10,880 
Excess deferred income tax reversal(2,431)(2,512)(2,431)(2,512)
Other(1)
(2,594)(1,506)(2,358)(899)
Income tax expense before ADITC$6,784 $6,954 $6,592 $7,469 
Additional ADITC amortization(19,250)(12,500)(19,250)(12,500)
Income tax benefit$(12,466)$(5,546)$(12,658)$(5,031)
Effective tax rate(26.4)%(13.0)%(27.8)%(11.9)%
(1) "Other" primarily consists of the net tax effect of Idaho Power's regulatory flow-through tax adjustments.