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COMMON STOCK: Common Stock Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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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.

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