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Derivatives and Risk Management (Tables)

12 Months Ended

Dec. 31, 2020

Derivative Instruments And Hedges [Abstract]

Schedule of Energy Commodity Derivative Volumes

The following table presents the underlying energy commodity derivative volumes as of December 31, 2020 that are 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
2021			1				224				10,353				65,188				17				451				5,448				39,273
2022			—				—				450				25,525				—				—				1,360				12,030
2023			—				—				—				4,950				—				—				1,360				900
2024			—				—				—				—				—				—				1,370				—
2025			—				—				—				—				—				—				1,115				—

As of December 31, 2020, there are no expected deliveries of energy commodity derivatives after 2025.

The following table presents the underlying energy commodity derivative volumes as of December 31, 2019 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
2020			2				442				9,813				78,803				133				1,724				2,984				37,848
2021			—				—				153				25,523				—				246				1,040				13,108
2022			—				—				225				4,725				—				—				—				675

As of December 31, 2019, there were no expected deliveries of energy commodity derivatives after 2022.

(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 that Avista Corp. has outstanding as of December 31 (dollars in thousands):

		2020				2019
Number of contracts			22				20
Notional amount (in United States dollars)		$	3,860			$	5,932
Notional amount (in Canadian dollars)			4,949				7,828

Summary of Unsettled Interest Rate Swap Derivatives

The following table summarizes the unsettled interest rate swap derivatives that Avista Corp. has 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, 2020			4				45,000			2021
			11				120,000			2022
			1				10,000			2023
December 31, 2019			7				70,000			2020
			3				35,000			2021
			10				110,000			2022

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, 2020 (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		$	30			$	—			$	—			$	30
Interest rate swap derivatives
Other current liabilities			—				(19,575	)			8,050				(11,525	)
Other non-current liabilities and deferred credits			952				(32,190	)			—				(31,238	)
Energy commodity derivatives
Other current assets			9,203				(8,306	)			—				897
Other property and investments-net and other    non-current assets			1,755				(1,159	)			—				596
Other current liabilities			11,037				(14,007	)			487				(2,483	)
Other non-current liabilities and deferred credits			1,725				(8,043	)			129				(6,189	)
Total derivative instruments recorded on the    balance sheet		$	24,702			$	(83,280	)		$	8,666			$	(49,912	)

The following table presents the fair values and locations of derivative instruments recorded on the Consolidated Balance Sheets as of December 31, 2019 (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		$	97			$	—			$	—			$	97
Interest rate swap derivatives
Other current assets			589				—				—				589
Other current liabilities			238				(9,379	)			1,316				(7,825	)
Other non-current liabilities and deferred credits			725				(24,677	)			5,454				(18,498	)
Energy commodity derivatives
Other current assets			416				(245	)			—				171
Other property and investments-net and other    non-current assets			6,369				(5,446	)			—				923
Other current liabilities			34,760				(41,241	)			3,378				(3,103	)
Other non-current liabilities and deferred credits			28				(1,215	)			—				(1,187	)
Total derivative instruments recorded on the    balance sheet		$	43,222			$	(82,203	)		$	10,148			$	(28,833	)

Schedule of Collateral Outstanding Related to Derivative Instruments

The following table presents Avista Corp.'s collateral outstanding related to its derivative instruments as of December 31 (in thousands):

		2020				2019
Energy commodity derivatives
Cash collateral posted		$	4,953			$	7,812
Letters of credit outstanding			23,500				17,400
Balance sheet offsetting (cash collateral against net derivative positions)			616				3,378
Interest rate swap derivatives
Cash collateral posted (offset by net derivative positions)			8,050				6,770

There were no letters of credit outstanding related to interest rate swap derivatives as of December 31, 2020 and December 31, 2019.

Certain of Avista Corp.’s derivative instruments contain provisions that require the Company 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 that are in a liability position and the amount of additional collateral Avista Corp. could be required to post as of December 31 (in thousands):

		2020				2019
Interest rate swap derivatives
Liabilities with credit-risk-related contingent features		$	50,813			$	34,056
Additional collateral to post			42,763				26,912

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