XML 77 R46.htm IDEA: XBRL DOCUMENT
v3.20.4

Energy Purchase Contracts (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Energy Purchase Contracts [Line Items] |
Schedule of Utility Total Expenses | Total expenses for power purchased, natural gas purchased, fuel for generation and other fuel costs, which are included in utility resource costs in the Consolidated Statements of Income, were as follows for the years ended December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Utility power resources |  | $ | 324,297 |  |  | $ | 376,769 |  |  | $ | 357,656 |
Future Contractual Commitments for Power Resources and Natural Gas Resources | The following table details Avista Utilities’ future contractual commitments for power resources (including transmission contracts) and natural gas resources (including transportation contracts) (dollars in thousands):
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Power resources |  | $ | 181,872 |  |  | $ | 177,786 |  |  | $ | 173,536 |  |  | $ | 157,221 |  |  | $ | 157,887 |  |  | $ | 849,444 |  |  | $ | 1,697,746 |
Natural gas resources |  |  | 67,717 |  |  |  | 52,158 |  |  |  | 42,499 |  |  |  | 35,598 |  |  |  | 32,473 |  |  |  | 241,145 |  |  |  | 471,590 |
Total |  | $ | 249,589 |  |  | $ | 229,944 |  |  | $ | 216,035 |  |  | $ | 192,819 |  |  | $ | 190,360 |  |  | $ | 1,090,589 |  |  | $ | 2,169,336 |
Contractual Obligations [Member] |
Energy Purchase Contracts [Line Items] |
Future Contractual Commitments for Power Resources and Natural Gas Resources | The following table details future contractual commitments under these agreements (dollars in thousands):
|  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | Thereafter |  |  | Total |
Contractual obligations |  | $ | 33,885 |  |  | $ | 31,339 |  |  | $ | 32,083 |  |  | $ | 35,682 |  |  | $ | 33,706 |  |  | $ | 208,526 |  |  | $ | 375,221 |

X
- Definition Energy Purchase Contracts [Line Items] + References No definition available. + Details
Name: | ava_EnergyPurchaseContractsLineItems
Namespace Prefix: | ava_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of the total amount of power purchased, natural gas purchased, fuel for generation and other fuel costs, which are included in utility resource costs in the Consolidated Statements of Income. + References No definition available. + Details
Name: | ava_ScheduleOfUtilityPowerResourcesTableTextBlock
Namespace Prefix: | ava_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=ava_ContractualObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |