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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2022

Long-Term Debt, Unclassified [Abstract]

Schedule of Long-term Debt Instruments

Maturity Year		Description		Interest Rate		2022				2021
Avista Corp. Secured Long-Term Debt
2022		First Mortgage Bonds		5.13%		$	—			$	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		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 (2)		4.00%			400,000				—
		Total Avista Corp. secured long-term debt					2,307,200				2,157,200
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					2,382,200				2,232,200
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					2,397,200				2,247,200
Other Long-Term Debt Components
		Unamortized debt discount					(726	)			(632	)
		Unamortized long-term debt issuance costs					(18,261	)			(14,498	)
		Total					2,378,213				2,232,070
		Secured Pollution Control Bonds held by Avista    Corporation (1)					(83,700	)			(83,700	)
		Current portion of long-term debt					(13,500	)			(250,000	)
		Total long-term debt				$	2,281,013			$	1,898,370

(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 has the ability to 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 will not be reflected as an asset or a liability on the Consolidated Balance Sheets.

(2)In March 2022, the Company issued and sold $400.0 million of 4.00 percent first mortgage bonds due in 2052 through a public offering. The total net proceeds from the sale of the bonds were used to repay the borrowings outstanding under Avista Corp.'s $400.0 million committed line of credit, as well as $250.0 million of maturing debt. In connection with the pricing of the first mortgage bonds in March 2022, the Company cash settled thirteen interest rate swap derivatives (notional aggregate amount of $140.0 million) and paid a net amount of $17.0 million. See Note 8 for a discussion of interest rate swap derivatives.

Schedule of Maturities of Long-term Debt

		2023				2024				2025				2026				2027				Thereafter				Total
Debt maturities		$	13,500			$	15,000			$	—			$	—			$	—			$	2,336,547			$	2,365,047

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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