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Energy Purchase Contracts (Tables) | 12 Months Ended
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Dec. 31, 2024
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 millions):
|  | 2024 |  |  | 2023 |  |  | 2022 |
Utility power resources |  | $ | 548 |  |  | $ | 607 |  |  | $ | 661 |
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 millions):
|  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | Thereafter |  |  | Total |
Power resources |  | $ | 333 |  |  | $ | 311 |  |  | $ | 285 |  |  | $ | 263 |  |  | $ | 264 |  |  | $ | 2,570 |  |  | $ | 4,026 |
Natural gas resources |  |  | 108 |  |  |  | 81 |  |  |  | 64 |  |  |  | 55 |  |  |  | 50 |  |  |  | 249 |  |  |  | 607 |
Total |  | $ | 441 |  |  | $ | 392 |  |  | $ | 349 |  |  | $ | 318 |  |  | $ | 314 |  |  | $ | 2,819 |  |  | $ | 4,633 |
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 millions):
|  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028 |  |  | 2029 |  |  | Thereafter |  |  | Total |
Contractual obligations |  | $ | 39 |  |  | $ | 40 |  |  | $ | 18 |  |  | $ | 18 |  |  | $ | 9 |  |  | $ | 165 |  |  | $ | 289 |

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- Definition Tabular disclosure of unconditional purchase obligation not recognized as liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 + Details
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