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LONG-TERM DEBT: Long-term debt narrative Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 | Mar. 13, 2025 | Feb. 03, 2025 | Dec. 31, 2024 | Dec. 02, 2024 | Aug. 12, 2024 | Oct. 14, 2022
First Mortgage Bonds 5.7% Series K Due 2055 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
First mortgage bonds | $ 400,000 |  |  | $ 0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% |  |  | 5.70% |  |  |
First Mortgage Bonds 5.7% Series K Due 2055 | First Mortgage |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.70% |  |  |  |  |
Variable Rate American Falls [Domain] | Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | $ 19,900 |  |  |  |
Humboldt County pollution control revenue bonds | Pollution Control Bonds 5.15 due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  | $ 49,800 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.45% |  |
First mortgage bonds 5.20 Series due 2034 | First Mortgage |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 300,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.20% |
Idaho Power Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount of debt securities and first mortgage bonds authorized | $ 1,200,000 |  |  |  |  |  |
Debt instrument interest rate limit | 8.00% |  |  |  |  |  |
Indenture, Unused Borrowing Capacity, Amount | $ 2,000,000 |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 2,300,000 |  |  |  |  |  |
Earnings test does not apply to refunding bonds that mature in less than this period of time | 2 years |  |  |  |  |  |
Percent of Operating Revenues Required to be Spent or Appropriated | 15.00% |  |  |  |  |  |
Time Period Expenditures or Appropriations can be Made Up | 5 years |  |  |  |  |  |
Idaho Power Company | Public Utility Commisions - Idaho, Oregon, and Washington |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Indenture, Unused Borrowing Capacity, Amount | $ 500,000 |  |  |  |  |  |
Idaho Power Company | Principal amount of debt securities in Selling Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount of debt securities in Selling Agreement | $ 2,100,000 |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  |  | $ 5,500,000

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