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COMMON STOCK: Common Stock, Number of Shares, Par Value and Other Disclosures (Details) - shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Class of Stock [Line Items]      
Common Stock, Shares, Issued 50,561,892 50,516,479 50,461,885
Shares issued during the year 53,345 45,413 54,594
Common Stock, Shares, Issued 50,615,237 50,561,892 50,516,479
Shares granted (in shares) 75,295 73,131 76,147
Directors      
Class of Stock [Line Items]      
Shares granted (in shares) 12,459 12,021 14,025
Directors | 2000 Long-Term Incentive and Compensation Plan      
Class of Stock [Line Items]      
Shares granted (in shares) 13,842 8,674 12,784
Continuous equity program (inactive)      
Class of Stock [Line Items]      
Shares issued during the year 0 0 0
Shares reserved for future issuance 3,000,000    
Dividend reinvestment and stock purchase plan      
Class of Stock [Line Items]      
Shares issued during the year 0 0 0
Shares reserved for future issuance 2,841,702    
Employee savings plan      
Class of Stock [Line Items]      
Shares issued during the year 0 0 0
Shares reserved for future issuance 3,567,954    
Long-term incentive and compensation plan      
Class of Stock [Line Items]      
Shares issued during the year [1] 53,345 45,413 54,594
Shares reserved for future issuance 1,161,509    
Restricted stock plan | Directors      
Class of Stock [Line Items]      
Shares granted (in shares) 12,459    
Forward Contracts      
Class of Stock [Line Items]      
Shares issued during the year 0 0 0
Shares reserved for future issuance 3,221,982    
[1] During 2023, 2022, and 2021, IDACORP granted 75,295, 73,131, and 76,147 restricted stock unit awards, respectively, to employees and 12,459, 12,021, and 14,025 shares of common stock, respectively, to directors. During 2023, 2022, and 2021, IDACORP issued 53,345, 45,413, and 54,594 shares of common stock, respectively, using original issuances of shares pursuant to the LTICP, including 13,842, 8,674, and 12,784 shares of common stock, respectively, issued to members of the board of directors.