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Derivatives and Risk Management (Tables) | 12 Months Ended
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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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