Debt security and first mortgage bond maximum interest rate limit imposed by the OPUC.

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Period of time for maturity if issuing refunding bonds to retire outstanding bonds for which the earnings test does not apply.

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Maximum amount of first mortgage bonds that could be issued under Idaho Power's Indenture of Mortgage and Deed of Trust, as of the balance sheet date.

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Amount of additional first mortgage bonds that could be issued under Idaho Power's Indenture of Mortgage and Deed of Trust, as of the balance sheet date.

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Principal amount of debt securities in Selling Agreement

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	3 Months Ended
LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Feb. 03, 2025	Aug. 12, 2024	Mar. 14, 2024
First Mortgage Bonds 5.20 Series Due 2034 [Domain]
Debt Instrument [Line Items]
Secured Long-term Debt, Noncurrent			$ 400,000
Debt Instrument, Interest Rate, Stated Percentage			5.70%
Variable Rate American Falls [Domain]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 19,900
Idaho Power Company
Debt Instrument [Line Items]
Debt instrument interest rate limit	8.00%
Indenture, Unused Borrowing Capacity, Amount	$ 2,000,000
Earnings test does not apply to refunding bonds that mature in less than this period of time	2 years
Indenture, Limit of first mortgate bonds at any one time outstanding	$ 5,500,000
Idaho Power Company \| Principal amount of debt securities in Selling Agreement
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	1,900,000
Principal amount of debt securities in Selling Agreement	2,100,000
Idaho Power Company \| Public Utility Commisions - Idaho, Oregon, and Washington
Debt Instrument [Line Items]
Indenture, Unused Borrowing Capacity, Amount	$ 500,000			$ 1,200,000