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Short-Term Borrowings - Schedule of Balances Outstanding and Interest Rates of Borrowings (Details) - USD ($)
$ in Millions

Jun. 30, 2025

Dec. 31, 2024

Avista Utilities [Member]

Short-term Debt [Line Items]

Borrowings outstanding at end of period

^[1]

$ 389

$ 342

Letters of credit outstanding at end of period

$ 5

$ 5

Average interest rate on borrowings at end of period

5.42%

5.52%

Alaska Electric Light & Power [Member]

Short-term Debt [Line Items]

Borrowings outstanding at end of period

^[2]

$ 16

$ 12

Average interest rate on borrowings at end of period

5.89%

6.13%

[1]

As of June 30, 2025, there was $389 million outstanding under the committed line of credit; however, $270 million was classified as short-term borrowings and $119 million was classified as long-term on the Condensed Consolidated Balance Sheet due to the Company's intention to refinance such amount on a long-term basis. The amount classified as long-term debt was refinanced through the issuance and sale of first mortgage bonds in July 2025. See Note 9 for further discussion of the first mortgage bonds and the refinancing of short-term debt on a long-term basis. The entire outstanding amount of the committed line of credit as of December 31, 2024 was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

[2]

As of June 30, 2025, the $16 million outstanding under the committed line of credit was classified as long-term on the Condensed Consolidated Balance Sheet due to AEL&P's intention to refinance such amount on a long-term basis. The borrowings were refinanced through entering a term loan agreement in July 2025. See Note 9 for further discussion of the term loan and the refinancing of short-term debt on a long-term basis. The entire outstanding amount of the committed line of credit as of December 31, 2024 was classified as short-term borrowings on the Condensed Consolidated Balance Sheet.

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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