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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