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COMMON STOCK: Common Stock, Number of Shares, Par Value and Other Disclosures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Class of Stock [Line Items]      
Common Stock, Shares, Issued 53,962,300 50,615,237 50,561,892
Common Stock, Shares, Issued 54,859,131 53,962,300 50,615,237
2000 Long-Term Incentive and Compensation Plan      
Class of Stock [Line Items]      
Shares issued during the year 45,348 61,997 53,345
Shares granted (in shares) 82,344 103,771 75,295
Directors | 2000 Long-Term Incentive and Compensation Plan      
Class of Stock [Line Items]      
Shares granted (in shares) 11,268 15,616 12,459
Shares issued (in shares) 9,273 10,571 13,842
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 49,569 63,084 0
Shares reserved for future issuance 2,729,049    
Employee savings plan      
Class of Stock [Line Items]      
Shares issued during the year 0 0 0
Shares reserved for future issuance 3,567,954    
2000 Long-term incentive and compensation plan      
Class of Stock [Line Items]      
Shares issued during the year [1] 45,348 61,997 53,345
Shares reserved for future issuance 2,154,164    
Forward Contracts      
Class of Stock [Line Items]      
Shares issued during the year 0 3,221,982 0
Shares reserved for future issuance 5,180,180    
At-the-Market Offering Program      
Class of Stock [Line Items]      
Shares issued during the year [2] 801,914 0 0
At-the-Market Offering Program, Maximum Value Of Shares To Be Issued $ 300,000    
Common Stock, Capital Shares Reserved For Future Issuance $ 155,500    
[1] During 2025, 2024, and 2023, IDACORP granted 82,344, 103,771, and 75,295 restricted stock unit awards, respectively, to employees and 11,268, 15,616, and 12,459 shares of common stock, respectively, to directors. During 2025, 2024, and 2023, IDACORP issued 45,348, 61,997, and 53,345 shares of common stock, respectively, using original issuances of shares pursuant to the LTICP, including 9,273, 10,571, and 13,842 shares of common stock, respectively, issued to members of the board of directors.
[2] During 2024, IDACORP reserved shares of its common stock through the ATM offering program, up to an aggregate gross sales price of $300 million. At December 31, 2025, $155.5 million in shares of IDACORP’s common stock remained reserved. For more details, see "At-the-Market Offering Program" below in this Note 6.