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COMMON STOCK: Common Stock Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
At-the-Market Offering Program      
Class of Stock [Line Items]      
At-the-Market Offering Program, Maximum Value Of Shares To Be Issued $ 300,000    
Common Stock, Capital Shares Reserved For Future Issuance $ 155,500    
Registered Public Offering, Initial Common Shares Offered | shares 452,256 801,914  
Registered Public Offering, Executed Amount $ 52,200 $ 92,400  
Registered Public Offering, Commission and Fees Amount $ 700 $ 1,200  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares 452,256    
Cash To Be Received On Settlement Of Forward Sale Agreement $ 51,759    
Cash To Deliver To Settle Forward Sales Agreement, Net $ 7,200    
Registered Public Offering, Price Per Share | $ / shares $ 114.45    
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares 801,914    
Cash Received On Settlement Of Forward Sale Agreement [1] $ 91,717    
Forward Sale Price, Per Share, Settled | $ / shares $ 114.37    
Common Shares To Deliver To Settle Forward Sales Agreement, Net | shares 54,968    
ATM Forward Sale Agreements Maturity 3/31/26 1      
Class of Stock [Line Items]      
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares 198,086    
Cash To Be Received On Settlement Of Forward Sale Agreement $ 22,789    
Registered Public Offering, Price Per Share | $ / shares $ 115.05    
ATM Forward Sale Agreements Maturity 3/31/26 2      
Class of Stock [Line Items]      
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares 254,170    
Cash To Be Received On Settlement Of Forward Sale Agreement $ 28,970    
Registered Public Offering, Price Per Share | $ / shares $ 113.98    
ATM Forward Sale Agreements Maturity 11/12/25      
Class of Stock [Line Items]      
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares 500,000    
Cash Received On Settlement Of Forward Sale Agreement [1] $ 56,924    
Forward Sale Price, Per Share, Settled | $ / shares $ 113.85    
ATM Forward Sale Agreements Maturity 12/31/25      
Class of Stock [Line Items]      
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares 301,914    
Cash Received On Settlement Of Forward Sale Agreement [1] $ 34,793    
Forward Sale Price, Per Share, Settled | $ / shares $ 115.24    
Forward Sale Agreements (2025 Series)      
Class of Stock [Line Items]      
Registered Public Offering, Initial Common Shares Offered | shares 4,504,505    
Registered Public Offering, Executed Amount $ 500,000    
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares 5,180,180    
Cash To Be Received On Settlement Of Forward Sale Agreement $ 560,900    
Cash To Deliver To Settle Forward Sales Agreement, Net $ 113,800    
Registered Public Offering, Price Per Share | $ / shares $ 111.00    
Common Shares To Deliver To Settle Forward Sales Agreement, Net | shares 874,426    
Registered Public Offering, Initial Common Shares Offered, Greenshoe | shares 675,675    
Registered Public Offering, Issuance Amount, Greenshoe $ 75,000    
Registered Public Offering, Initial Common Shares Offered, Total | shares 5,180,180    
Initial Forward Sale Price, Per Share | $ / shares $ 107.67    
Forward Sale Agreements (2023 Series)      
Class of Stock [Line Items]      
Registered Public Offering, Initial Common Shares Offered | shares     2,801,724
Registered Public Offering, Executed Amount     $ 260,000
Registered Public Offering, Price Per Share | $ / shares     $ 92.80
Registered Public Offering, Initial Common Shares Offered, Greenshoe | shares     420,258
Registered Public Offering, Issuance Amount, Greenshoe     $ 39,000
Registered Public Offering, Initial Common Shares Offered, Total | shares     3,221,982
Initial Forward Sale Price, Per Share | $ / shares     $ 90.016
Registered Public Offering, Common Shares Settled | shares   2,542,442  
Registered Public Offering, Settled Amount   $ 230,000  
Registered Public Offering, Common Shares Settled, Final | shares   679,540  
Registered Public Offering, Settled Amount, Final   $ 62,200  
IDACORP      
Class of Stock [Line Items]      
Maximum leverage ratio requirement 0.65    
Leverage ratio 0.52    
Amount dividends were limited to based on covenant restrictions $ 1,500,000    
Incremental CommonShares Attributable To Share Based Payment Arrangements, Forward Sale Agreement | shares 490,000 47,000 34,000
Idaho Power Company      
Class of Stock [Line Items]      
Proceeds from Contributed Capital $ 195,000 $ 200,000  
Amount dividends were limited to based on covenant restrictions $ 1,300,000    
Percentage of capital threshold below which Idaho Power will not pay dividends to IDACORP 0.35    
Equity Capital Ratio 0.48    
Shares of preferred stock outstanding | shares 0    
[1] Settlement of the FSAs are reflected in IDACORP’s equity.