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SHARE-BASED COMPENSATION Share-based Compensation Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Equity compensation costs capitalized | $ 0 |  |
Shares granted (in shares) | 75,295 | 73,131 | 76,147
Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares granted (in shares) | 12,459 | 12,021 | 14,025
Restricted stock 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) | $ 7,500,000 | $ 6,900,000 | $ 6,700,000
Vesting period of restricted stock awards | 3 years |  |
Restricted stock plan | Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares granted - weighted average grant-date fair value (in dollars per share) | $ 103.48 |  |
Deferred shares (in shares) | 4,640 |  |
Shares granted (in shares) | 12,459 |  |
Restricted stock plan | IDACORP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Unrecognized compensation cost | $ 8,000,000 |  |
Shares granted - weighted average grant-date fair value (in dollars per share) | $ 103.98 |  |
Shares granted (in shares) | 94,580 |  |
Period over which unrecognized compensation cost will be recognized (in years) | 1 year 7 months 6 days |  |
Restricted stock 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) | $ 103.98 |  |
Shares granted (in shares) | 94,118 |  |
Share-based Payment Arrangement [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Maximum shares outstanding (in shares) | 244,938 |  |
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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