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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2024
Long-Term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments |
Maturity Year |  | Description |  | Interest Rate |  | 2024 |  |  | 2023 |
Avista Corp. Secured Long-Term Debt |  |  |  |  |  |  |  |
2028 |  | Secured Medium-Term Notes |  | 6.37% |  | $ | 25 |  |  | $ | 25 |
2032 |  | Secured Pollution Control Bonds (1) |  | 3.88% |  |  | 67 |  |  |  | 67 |
2034 |  | Secured Pollution Control Bonds (1) |  | 3.88% |  |  | 17 |  |  |  | 17 |
2035 |  | First Mortgage Bonds |  | 6.25% |  |  | 150 |  |  |  | 150 |
2037 |  | First Mortgage Bonds |  | 5.70% |  |  | 150 |  |  |  | 150 |
2040 |  | First Mortgage Bonds |  | 5.55% |  |  | 35 |  |  |  | 35 |
2041 |  | First Mortgage Bonds |  | 4.45% |  |  | 85 |  |  |  | 85 |
2044 |  | First Mortgage Bonds |  | 4.11% |  |  | 60 |  |  |  | 60 |
2045 |  | First Mortgage Bonds |  | 4.37% |  |  | 100 |  |  |  | 100 |
2047 |  | First Mortgage Bonds |  | 4.23% |  |  | 80 |  |  |  | 80 |
2047 |  | First Mortgage Bonds |  | 3.91% |  |  | 90 |  |  |  | 90 |
2048 |  | First Mortgage Bonds |  | 4.35% |  |  | 375 |  |  |  | 375 |
2049 |  | First Mortgage Bonds |  | 3.43% |  |  | 180 |  |  |  | 180 |
2050 |  | First Mortgage Bonds |  | 3.07% |  |  | 165 |  |  |  | 165 |
2051 |  | First Mortgage Bonds |  | 3.54% |  |  | 175 |  |  |  | 175 |
2051 |  | First Mortgage Bonds |  | 2.90% |  |  | 140 |  |  |  | 140 |
2052 |  | First Mortgage Bonds |  | 4.00% |  |  | 400 |  |  |  | 400 |
2053 |  | First Mortgage Bonds |  | 5.66% |  |  | 250 |  |  |  | 250 |
|  | Total Avista Corp. secured long-term debt |  |  |  |  | 2,544 |  |  |  | 2,544 |
Alaska Electric Light and Power Company Secured Long-Term Debt |  |  |  |  |  |  |  |
2044 |  | First Mortgage Bonds |  | 4.54% |  |  | 75 |  |  |  | 75 |
|  | Total secured long-term debt |  |  |  |  | 2,619 |  |  |  | 2,619 |
Alaska Energy and Resources Company Unsecured Long-Term Debt |  |  |  |  |  |  |  |
2029 |  | Unsecured Term Loan (2) |  | 5.92% |  |  | 15 |  |  |  | 15 |
|  | Total secured and unsecured long-term debt |  |  |  |  | 2,634 |  |  |  | 2,634 |
Other Long-Term Debt Components |  |  |  |  |  |  |  |
|  | Unamortized debt discount |  |  |  |  | (1 | ) |  |  | (1 | )
|  | Unamortized long-term debt issuance costs |  |  |  |  | (19 | ) |  |  | (19 | )
|  | Total |  |  |  |  | 2,614 |  |  |  | 2,614 |
|  | Secured Pollution Control Bonds held by Avista Corporation (1) |  |  |  |  | — |  |  |  | (84 | )
|  | Current portion of long-term debt |  |  |  |  | — |  |  |  | (15 | )
|  | Total long-term debt |  |  |  | $ | 2,614 |  |  | $ | 2,515 |
(1) In April 2024, the Company remarketed the City of Forsyth, Montana Pollution Control Revenue Refunding Bonds. The bonds are not subject to ordinary optional redemption. The bonds are secured by equal principal amounts of non-transferable first mortgage bonds of the Company. Avista Corp. had purchased the Forsyth bonds upon original issuance in December 2010 and held the bonds until market conditions were favorable for remarketing the bonds to unaffiliated investors. In connection with the pricing of the Forsyth bonds, the Company cash-settled two interest rate swap derivatives (notional aggregate amount of $20 million) and received a net amount of $4 million. See note 8 for a discussion of interest rate swap derivatives. (2) In December 2024, AERC entered an amended agreement for its $15 million unsecured term loan. The amendment extends the maturity to December 2029, and increases the interest rate from 3.44 percent to 5.92 percent.
Schedule of Maturities of Long-term Debt |
|  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | Thereafter |  |  | Total |
Debt maturities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 25 |  |  | $ | 15 |  |  | $ | 2,646 |  |  | $ | 2,686 |

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