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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract] |  |  |  |
Reclassifications |  | $ 682 | $ 1,138 | $ 586
Accumulated Defined Benefit Pension Items |  |  |  |
Reclassifications out of Accumulated Other Comprehensive Income before Tax [Abstract] |  |  |  |
Amortization of prior service cost | [1] | 221 | 220 | 219
Amortization of net loss | [1] | 690 | 1,312 | 570
Total reclassifications, before tax - pension and postretirement benefits | [1] | 911 | 1,532 | 789
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent | [2] | (229) | (394) | (203)
Total reclassification, net of tax - pension and postretirement benefits |  | 682 | 1,138 | 586
Reclassifications |  | $ 682 | $ 1,138 | $ 586
[1] | Amortization of these items is included in "Other (income) expense, net" in the consolidated income statements of both IDACORP and Idaho Power.
[2] | The tax benefit is included in "Income tax expense" in the consolidated income statements of both IDACORP and Idaho Power

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