Derivatives and Risk Management (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedges, Assets [Abstract]

Schedule of Energy Commodity Derivative Volumes

The following table presents the underlying energy commodity derivative volumes as of December 31, 2023 expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
2024		9		—		22,747		74,596		472		510		1,723		12,038
2025		—		—		12,505		19,590		11		96		1,115		1,125
2026		—		—		5,570		3,940		—		—		—		—

As of December 31, 2023, there are no expected deliveries of energy commodity derivatives after 2026.

The following table presents the underlying energy commodity derivative volumes as of December 31, 2022 that were expected to be delivered in each respective year (in thousands of MWhs and mmBTUs):

	Purchases								Sales
	Electric Derivatives				Gas Derivatives				Electric Derivatives				Gas Derivatives
Year	Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs		Physical (1) MWh		Financial (1) MWh		Physical (1) mmBTUs		Financial (1) mmBTUs
2023		5		—		19,140		79,253		136		1,011		4,145		29,473
2024		—		—		533		30,658		—		—		1,370		9,668
2025		—		—		450		4,895		—		—		1,115		1,125

As of December 31, 2022, there were no expected deliveries of energy commodity derivatives after 2025.

(1)Physical transactions represent commodity transactions in which Avista Corp. will take or make delivery of either electricity or natural gas; financial transactions represent derivative instruments with delivery of cash in the amount of

the benefit or cost but with no physical delivery of the commodity, such as futures, swap derivatives, options, or forward contracts.

Summary of Foreign Currency Exchange Derivatives

The following table summarizes the foreign currency exchange derivatives outstanding as of December 31 (dollars in thousands):

	2023		2022
Number of contracts		5		19
Notional amount (in United States dollars)	$	81	$	8,563
Notional amount (in Canadian dollars)		109		11,659

Summary of Unsettled Interest Rate Swap Derivatives

The following table summarizes the unsettled interest rate swap derivatives outstanding as of the balance sheet date indicated below (dollars in thousands):

Balance Sheet Date	Number of Contracts		Notional Amount		Mandatory Cash Settlement Date
December 31, 2023		2	$	20,000	2024
		1		10,000	2025
December 31, 2022		4	$	40,000	2023
		1		10,000	2024

Schedules of Fair Values and Locations of Derivative Instruments

The following table presents the fair values and locations of derivative instruments recorded on the Consolidated Balance Sheets as of December 31, 2023 (dollars in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netting		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current assets	$	2	$	—		$	—	$	2
Interest rate swap derivatives
Other current assets		3,667		—			—		3,667
Other non-current liabilities and deferred credits		—		(182	)		—		(182	)
Energy commodity derivatives
Other current assets		8,531		(379	)		—		8,152
Other current liabilities		19,510		(79,082	)		42,355		(17,217	)
Other non-current liabilities and deferred credits		2,913		(20,633	)		—		(17,720	)
Total derivative instruments recorded on the    balance sheet	$	34,623	$	(100,276	)	$	42,355	$	(23,298	)

The following table presents the fair values and locations of derivative instruments recorded on the Consolidated Balance Sheets as of December 31, 2022 (dollars in thousands):

	Fair Value
Derivative and Balance Sheet Location	Gross Asset		Gross Liability			Collateral Netting		Net Asset (Liability) on Balance Sheet
Foreign currency exchange derivatives
Other current assets	$	43	$	—		$	—	$	43
Other current liabilities		—		(3	)		—		(3	)
Interest rate swap derivatives
Other current assets		8,536		—			—		8,536
Other property and investments-net and other non-current assets		2,648		—			—		2,648
Other current liabilities		—		(52	)		—		(52	)
Energy commodity derivatives
Other current assets		32,257		(22,638	)		—		9,619
Other property and investments-net and other    non-current assets		312		(16	)		—		296
Other current liabilities		107,902		(229,607	)		94,850		(26,855	)
Other non-current liabilities and deferred credits		6,049		(24,530	)		10,589		(7,892	)
Total derivative instruments recorded on the    balance sheet	$	157,747	$	(276,846	)	$	105,439	$	(13,660	)

Schedule of Collateral Outstanding Related to Derivative Instruments

The following table presents collateral outstanding related to its derivative instruments as of December 31 (dollars in thousands):

	2023		2022
Energy commodity derivatives
Cash collateral posted	$	43,095	$	171,581
Letters of credit outstanding		20,000		49,425
Balance sheet offsetting (cash collateral against net derivative positions)		42,355		105,439

There were no letters of credit outstanding related to interest rate swap derivatives as of December 31, 2023 and December 31, 2022.

Certain of Avista Corp.’s derivative instruments contain provisions requiring Avista Corp. to maintain an “investment grade” credit rating from the major credit rating agencies. If Avista Corp.’s credit ratings were to fall below “investment grade,” it would be in violation of these provisions, and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing collateralization on derivative instruments in net liability positions.

The following table presents the aggregate fair value of all derivative instruments with credit-risk-related contingent features in a liability position and the amount of additional collateral Avista Corp. could be required to post as of December 31 (dollars in thousands):

	2023
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features	$	182
Additional collateral to post		182
Energy commodity derivatives
Liabilities with credit-risk-related contingent features	$	18,016
Additional collateral to post		15,125