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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-Term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments |
Maturity Year |  | Description |  | Interest Rate |  | 2023 |  |  | 2022 |
Avista Corp. Secured Long-Term Debt |  |  |  |  |  |  |  |
2023 |  | Secured Medium-Term Notes |  | 7.18%-7.54% |  |  | — |  |  |  | 13,500 |
2028 |  | Secured Medium-Term Notes |  | 6.37% |  |  | 25,000 |  |  |  | 25,000 |
2032 |  | Secured Pollution Control Bonds (1) |  | (1) |  |  | 66,700 |  |  |  | 66,700 |
2034 |  | Secured Pollution Control Bonds (1) |  | (1) |  |  | 17,000 |  |  |  | 17,000 |
2035 |  | First Mortgage Bonds |  | 6.25% |  |  | 150,000 |  |  |  | 150,000 |
2037 |  | First Mortgage Bonds |  | 5.70% |  |  | 150,000 |  |  |  | 150,000 |
2040 |  | First Mortgage Bonds |  | 5.55% |  |  | 35,000 |  |  |  | 35,000 |
2041 |  | First Mortgage Bonds |  | 4.45% |  |  | 85,000 |  |  |  | 85,000 |
2044 |  | First Mortgage Bonds |  | 4.11% |  |  | 60,000 |  |  |  | 60,000 |
2045 |  | First Mortgage Bonds |  | 4.37% |  |  | 100,000 |  |  |  | 100,000 |
2047 |  | First Mortgage Bonds |  | 4.23% |  |  | 80,000 |  |  |  | 80,000 |
2047 |  | First Mortgage Bonds |  | 3.91% |  |  | 90,000 |  |  |  | 90,000 |
2048 |  | First Mortgage Bonds |  | 4.35% |  |  | 375,000 |  |  |  | 375,000 |
2049 |  | First Mortgage Bonds |  | 3.43% |  |  | 180,000 |  |  |  | 180,000 |
2050 |  | First Mortgage Bonds |  | 3.07% |  |  | 165,000 |  |  |  | 165,000 |
2051 |  | First Mortgage Bonds |  | 3.54% |  |  | 175,000 |  |  |  | 175,000 |
2051 |  | First Mortgage Bonds |  | 2.90% |  |  | 140,000 |  |  |  | 140,000 |
2052 |  | First Mortgage Bonds |  | 4.00% |  |  | 400,000 |  |  |  | 400,000 |
2053 |  | First Mortgage Bonds (2) |  | 5.66% |  |  | 250,000 |  |  |  | — |
|  | Total Avista Corp. secured long-term debt |  |  |  |  | 2,543,700 |  |  |  | 2,307,200 |
Alaska Electric Light and Power Company Secured Long-Term Debt |  |  |  |  |  |  |  |
2044 |  | First Mortgage Bonds |  | 4.54% |  |  | 75,000 |  |  |  | 75,000 |
|  | Total secured long-term debt |  |  |  |  | 2,618,700 |  |  |  | 2,382,200 |
Alaska Energy and Resources Company Unsecured Long-Term Debt |  |  |  |  |  |  |  |
2024 |  | Unsecured Term Loan |  | 3.44% |  |  | 15,000 |  |  |  | 15,000 |
|  | Total secured and unsecured long-term debt |  |  |  |  | 2,633,700 |  |  |  | 2,397,200 |
Other Long-Term Debt Components |  |  |  |  |  |  |  |
|  | Unamortized debt discount |  |  |  |  | (689 | ) |  |  | (726 | )
|  | Unamortized long-term debt issuance costs |  |  |  |  | (18,953 | ) |  |  | (18,261 | )
|  | Total |  |  |  |  | 2,614,058 |  |  |  | 2,378,213 |
|  | Secured Pollution Control Bonds held by Avista Corporation (1) |  |  |  |  | (83,700 | ) |  |  | (83,700 | )
|  | Current portion of long-term debt |  |  |  |  | (15,000 | ) |  |  | (13,500 | )
|  | Total long-term debt |  |  |  | $ | 2,515,358 |  |  | $ | 2,281,013 |
(1) In December 2010, $66.7 million and $17.0 million of the City of Forsyth, Montana Pollution Control Revenue Refunding Bonds (Avista Corporation Colstrip Project) due in 2032 and 2034, respectively, which had been held by Avista Corp. since 2008 and 2009, respectively, were refunded by new variable rate bond issues. The new bonds were not offered to the public and were purchased by Avista Corp. due to market conditions. The Company can remarket these bonds to unaffiliated investors at a later date, subject to market conditions. So long as Avista Corp. is the holder of these bonds, the bonds are not reflected as an asset or a liability on the Consolidated Balance Sheets. (2) In March 2023, the Company issued and sold $250.0 million of 5.66 percent first mortgage bonds due in 2053 with institutional investors in the private placement market. A portion of the net proceeds from the sale of these bonds was used for the construction or improvement of utility facilities, and a portion was used to refinance existing indebtedness, including the repayment of Avista Corp.'s $150.0 million term loan. In connection with the pricing of the first mortgage bonds in March 2023, the Company cash settled four interest rate swap derivatives (notional aggregate amount of $40.0 million) and received a net amount of $7.5 million. See Note 8 for a discussion of interest rate swap derivatives.
Schedule of Maturities of Long-term Debt |
|  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | Thereafter |  |  | Total |
Debt maturities |  | $ | 15,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 25,000 |  |  | $ | 2,561,547 |  |  | $ | 2,601,547 |

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