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Short-Term Borrowings (Tables) | 6 Months Ended
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Jun. 30, 2025
Avista Utilities [Member] |
Line of Credit Facility [Line Items] |
Schedule of Balances Outstanding and Interest Rates of Borrowings | Balances outstanding and interest rates on borrowings (excluding letters of credit) under Avista Corp.’s revolving committed line of credit were as follows as of June 30, 2025 and December 31, 2024 (dollars in millions):
|  | June 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
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 | %
(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.
Alaska Electric Light & Power [Member] |
Line of Credit Facility [Line Items] |
Schedule of Balances Outstanding and Interest Rates of Borrowings | Balances outstanding and interest rates on borrowings under AEL&P’s revolving committed line of credit were as follows as of June 30, 2025 and December 31, 2024 (dollars in millions):
|  | June 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Borrowings outstanding at end of period (1) |  | $ | 16 |  |  | $ | 12 |
Average interest rate on borrowings at end of period |  |  | 5.89 | % |  |  | 6.13 | %
(1) 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.

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