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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