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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Long Term Debt [Abstract] |
Schedule of Long-term Debt Instruments |
Maturity Year |  | Description |  | Interest Rate |  |  | 2020 |  |  | 2019 |
Avista Corp. Secured Long-Term Debt |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | First Mortgage Bonds |  | 3.89% |  |  |  | — |  |  |  | 52,000 |
2022 |  | First Mortgage Bonds |  | 5.13% |  |  |  | 250,000 |  |  |  | 250,000 |
2023 |  | Secured Medium-Term Notes |  | 7.18%-7.54% |  |  |  | 13,500 |  |  |  | 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 (2) |  | 3.07% |  |  |  | 165,000 |  |  |  | — |
2051 |  | First Mortgage Bonds |  | 3.54% |  |  |  | 175,000 |  |  |  | 175,000 |
|  | Total Avista Corp. secured long-term debt |  |  |  |  |  |  | 2,017,200 |  |  |  | 1,904,200 |
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 |  |  |  |  |  |  | 2,092,200 |  |  |  | 1,979,200 |
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 |  |  |  |  |  |  | 2,107,200 |  |  |  | 1,994,200 |
Other Long-Term Debt Components |  |  |  |  |  |  |  |  |  |  |  |
|  | Unamortized debt discount |  |  |  |  |  |  | (710 | ) |  |  | (788 | )
|  | Unamortized long-term debt issuance costs |  |  |  |  |  |  | (14,256 | ) |  |  | (13,944 | )
|  | Total |  |  |  |  |  |  | 2,092,234 |  |  |  | 1,979,468 |
|  | Secured Pollution Control Bonds held by Avista Corporation (1) |  |  |  |  |  |  | (83,700 | ) |  |  | (83,700 | )
|  | Current portion of long-term debt |  |  |  |  |  |  | — |  |  |  | (52,000 | )
|  | Total long-term debt |  |  |  |  |  | $ | 2,008,534 |  |  | $ | 1,843,768 |
(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 (Series 2010A and Series 2010B). The new bonds were not offered to the public and were purchased by Avista Corp. due to market conditions. The Company expects that at a later date, subject to market conditions, these bonds may be remarketed to
| unaffiliated investors. So long as Avista Corp. is the holder of these bonds, the bonds will not be reflected as an asset or a liability on Avista Corp.'s Consolidated Balance Sheets.
(2) | In September 2020, the Company issued and sold $165.0 million of 3.07 percent first mortgage bonds due in 2050 pursuant to a bond purchase agreement with institutional investors in the private placement market. The total net proceeds from the sale of the bonds were used to repay maturing long-term debt of $52.0 million and repay a portion of the outstanding balance under Avista Corp.'s $400.0 million committed line of credit. In connection with the pricing of the first mortgage bonds in June 2020, the Company cash settled seven interest rate swap derivatives (notional aggregate amount of $70.0 million) and paid a net amount of $33.5 million. See Note 7 for a discussion of interest rate swap derivatives.
Schedule of Maturities of Long-term Debt |
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Debt maturities |  | $ | — |  |  | $ | 250,000 |  |  | $ | 13,500 |  |  | $ | 15,000 |  |  | $ | — |  |  | $ | 1,796,547 |  |  | $ | 2,075,047 |

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