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SHARE-BASED COMPENSATION Share-based Compensation Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Equity compensation costs capitalized | $ 0 |  |
2000 Long-Term Incentive and Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Percent of target award, minimum | 0.00% |  |
Percent of target award, maximum | 200.00% |  |
Total fair value of shares vested (in shares) | $ 7,400,000 | $ 8,500,000 | $ 7,500,000
Vesting period of restricted stock awards | 3 years |  |
2000 Long-Term Incentive and Compensation Plan | Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares granted - weighted average grant-date fair value (in dollars per share) | $ 117.98 |  |
Deferred shares (in shares) | 5,532 |  |
Shares granted (in shares) | 11,268 |  |
2000 Long-Term Incentive and Compensation Plan | IDACORP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Unrecognized compensation cost | $ 11,500,000 |  |
Shares granted - weighted average grant-date fair value (in dollars per share) | $ 107.76 |  |
Shares granted (in shares) | 82,344 |  |
Period over which unrecognized compensation cost will be recognized (in years) | 1 year 8 months 12 days |  |
2000 Long-Term Incentive and Compensation Plan | Idaho Power Company |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares granted - weighted average grant-date fair value (in dollars per share) | $ 107.76 |  |
Shares granted (in shares) | 81,973 |  |
Share-based Payment Arrangement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Maximum shares outstanding (in shares) | 1,119,104 |  |
2000 Long-term incentive and compensation plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |

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