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SHARE-BASED COMPENSATION Share-based Compensation Narrative (Details) - USD ($)	12 Months Ended
	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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