v3.26.1
COMMON STOCK: Level 4 (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 14, 2026
USD ($)
Jul. 13, 2026
USD ($)
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
shares
Jul. 13, 2026
USD ($)
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
shares
Idaho Power Company              
Shareholders' equity              
Proceeds from Contributed Capital | $     $ 100,000     $ 190,000  
Ratio of Indebtedness to Net Capital     0.52     0.52  
Dividend Distribution Restriction Amount | $     $ 1,500,000     $ 1,500,000  
Dividend Distribution Restriction Threshold     0.35     0.35  
Ratio of total Capital to total capital and long-term debt     0.48     0.48  
Preferred Stock, Shares Outstanding | shares     0     0  
Idaho Power Company | Subsequent Event              
Shareholders' equity              
Proceeds from Contributed Capital | $ $ 186,800            
IDACORP              
Shareholders' equity              
Stock Issued During Period, Shares, New Issues | shares           1,255,676  
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements | shares     1,291,000 186,000   1,236,000 89,000
Maximum leverage ratio requirement     0.65     0.65  
Ratio of Indebtedness to Net Capital     0.53     0.53  
Dividend Distribution Restriction Amount | $     $ 1,500,000     $ 1,500,000  
IDACORP | Performance Shares              
Shareholders' equity              
Stock Issued During Period, Shares, New Issues | shares           55,032  
Restricted Stock Unit Awards to Employees | shares           71,855  
IDACORP | Directors              
Shareholders' equity              
Stock Issued During Period, Shares, New Issues | shares           31,837  
IDACORP | Dividend Reinvestment and Stock Purchase Plan              
Shareholders' equity              
Stock Issued During Period, Shares, New Issues | shares           20,667  
IDACORP | At-the-Market Offering Program (2024 Series)              
Shareholders' equity              
At-the-Market Offering Program, Maximum Value Of Shares To Be Issued, Gross Sales Price | $           $ 300,000  
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares           452,256  
Cash Received On Settlement Of Forward Sale Agreement | $ [1]           $ 51,729  
Forward Sale Price, Per Share, Settled | $ / shares           $ 114.38  
IDACORP | At-the-Market Offering Program (2026 Series)              
Shareholders' equity              
At-the-Market Offering Program, Maximum Value Of Shares To Be Issued, Gross Sales Price | $           $ 600,000  
At-the-Market Offering Program, Remaining Value Of Shares Available for Issuance, Gross Sales Price | $     337,400     $ 337,400  
IDACORP | At-the-Market Offering Programs (2024 & 2026 Series)              
Shareholders' equity              
At-the-Market Offering Program, Initial Common Shares Offered | shares           2,995,502  
At-the-Market Offering Program, Executed Amount | $           $ 418,000  
At-the-Market Offering Program, Commission and Fees Amount | $           4,300  
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 414,797     $ 414,797  
Forward Sale Price, Price Per Share | $ / shares     $ 138.47     $ 138.47  
Cash To Deliver To Settle Forward Sales Agreement, Net | $     $ 17,600     $ 17,600  
Common Shares To Deliver To Settle Forward Sales Agreement, Net | shares     121,620     121,620  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     2,995,502     2,995,502  
IDACORP | ATM Forward Sale Agreements Maturity 3/31/27              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 74,104     $ 74,104  
Forward Sale Price, Price Per Share | $ / shares     $ 139.82     $ 139.82  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     530,000     530,000  
IDACORP | ATM Forward Sale Agreements Maturity 3/31/27 1 [Member]              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 34,763     $ 34,763  
Forward Sale Price, Price Per Share | $ / shares     $ 141.41     $ 141.41  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     245,830     245,830  
IDACORP | ATM Forward Sale Agreements Maturity 3/31/27 2              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 45,027     $ 45,027  
Forward Sale Price, Price Per Share | $ / shares     $ 138.31     $ 138.31  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     325,561     325,561  
IDACORP | ATM Forward Sale Agreements Maturity 5/28/27              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 74,490     $ 74,490  
Forward Sale Price, Price Per Share | $ / shares     $ 139.46     $ 139.46  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     534,111     534,111  
IDACORP | ATM Forward Sale Agreements Maturity 5/28/27 1              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 73,953     $ 73,953  
Forward Sale Price, Price Per Share | $ / shares     $ 139.53     $ 139.53  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     530,000     530,000  
IDACORP | ATM Forward Sale Agreements Maturity 12/3/27              
Shareholders' equity              
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 112,460     $ 112,460  
Forward Sale Price, Price Per Share | $ / shares     $ 135.49     $ 135.49  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     830,000     830,000  
IDACORP | ATM Forward Sale Agreements Maturity 3/31/26              
Shareholders' equity              
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares           198,086  
Cash Received On Settlement Of Forward Sale Agreement | $ [1]           $ 22,777  
Forward Sale Price, Per Share, Settled | $ / shares           $ 114.99  
IDACORP | ATM Forward Sale Agreements Maturity 3/31/26 1              
Shareholders' equity              
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares           254,170  
Cash Received On Settlement Of Forward Sale Agreement | $ [1]           $ 28,952  
Forward Sale Price, Per Share, Settled | $ / shares           $ 113.91  
IDACORP | Forward Sale Agreements (2025 Series)              
Shareholders' equity              
Registered Public Offering, Initial Common Shares Offered | shares           4,504,505  
Registered Public Offering, Executed Amount | $           $ 500,000  
Cash To Be Received On Settlement Of Forward Sale Agreement | $     $ 484,600     484,600  
Cash To Deliver To Settle Forward Sales Agreement, Net | $     $ 162,000     $ 162,000  
Common Shares To Deliver To Settle Forward Sales Agreement, Net | shares     1,124,318     1,124,318  
Registered Public Offering, Price Per Share | $ / shares           $ 111.00  
Registered Public Offering, Initial Common Shares Offered, Greenshoe | shares           675,675  
Registered Public Offering, Executed 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  
Common Shares To Deliver To Settle Forward Sales Agreement, Gross | shares     4,484,296     4,484,296  
IDACORP | Forward Sale Agreements (2025 Series) | Subsequent Event              
Shareholders' equity              
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares         2,422,611    
Cash Received On Settlement Of Forward Sale Agreement | $ [2]         $ 261,775    
Forward Sale Price, Per Share, Settled | $ / shares         $ 108.05    
IDACORP | Forward Sale Agreements Settlement Date 5/28/26 (2025 Series)              
Shareholders' equity              
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares           695,884  
Cash Received On Settlement Of Forward Sale Agreement | $ [2]           $ 75,000  
Forward Sale Price, Per Share, Settled | $ / shares           $ 107.78  
IDACORP | Forward Sale Agreements Settlement Date 5/28/26 1 (2025 Series) | Subsequent Event              
Shareholders' equity              
Common Shares Delivered To Settle Forward Sales Agreement, Gross | shares   1,726,727          
Cash Received On Settlement Of Forward Sale Agreement | $ [2]   $ 186,775          
Forward Sale Price, Per Share, Settled | $ / shares   $ 108.17          
[1] Settlement of the FSAs is recognized in IDACORP’s equity on the settlement date.
[2] Settlement of the FSAs is recognized in IDACORP’s equity on the settlement date.