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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |  |
Unbilled Accounts Receivable |  | Accounts receivable includes unbilled energy revenues of the following amounts as of December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |
Unbilled accounts receivable |  | $ | 78,531 |  |  | $ | 81,691 |
Schedule of Utilities Operating Revenue Expense Taxes |  | Utility-related taxes included in revenue from contracts with customers were as follows for the years ended December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |  |  | 2021 |
Utility-related taxes |  | $ | 75,404 |  |  | $ | 69,931 |  |  | $ | 62,736 |
Disaggregation of Revenue | Disaggregation of Total Operating Revenue The following table disaggregates total operating revenue by segment and source for the years ended December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |  |  | 2021 |
Avista Utilities |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  | $ | 1,485,510 |  |  | $ | 1,400,027 |  |  | $ | 1,233,904 |
Derivative revenues |  |  | 199,133 |  |  |  | 286,309 |  |  |  | 152,590 |
Alternative revenue programs |  |  | 4,899 |  |  |  | (33,357 | ) |  |  | (6,635 | )
Deferrals and amortizations for rate refunds to customers |  |  | 1,026 |  |  |  | 207 |  |  |  | 2,984 |
Other utility revenues |  |  | 12,289 |  |  |  | 10,629 |  |  |  | 10,156 |
Total Avista Utilities |  |  | 1,702,857 |  |  |  | 1,663,815 |  |  |  | 1,392,999 |
AEL&P |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  | 47,525 |  |  |  | 45,703 |  |  |  | 45,051 |
Deferrals and amortizations for rate refunds to customers |  |  | — |  |  |  | (614 | ) |  |  | (190 | )
Other utility revenues |  |  | 614 |  |  |  | 615 |  |  |  | 505 |
Total AEL&P |  |  | 48,139 |  |  |  | 45,704 |  |  |  | 45,366 |
Other |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  | — |  |  |  | — |  |  |  | 2 |
Other revenues |  |  | 558 |  |  |  | 688 |  |  |  | 569 |
Total Other |  |  | 558 |  |  |  | 688 |  |  |  | 571 |
Total operating revenues |  | $ | 1,751,554 |  |  | $ | 1,710,207 |  |  | $ | 1,438,936 |
Utility Revenue from Contracts with Customers by Type and Service The following table disaggregates revenue from contracts with customers associated with the Company's electric operations for the years ended December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | Avista Utilities |  |  | AEL&P |  |  | Total Utility |  |  | Avista Utilities |  |  | AEL&P |  |  | Total Utility |  |  | Avista Utilities |  |  | AEL&P |  |  | Total Utility |
ELECTRIC OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 425,258 |  |  | $ | 20,232 |  |  | $ | 445,490 |  |  | $ | 414,823 |  |  | $ | 19,667 |  |  | $ | 434,490 |  |  | $ | 394,717 |  |  | $ | 18,940 |  |  | $ | 413,657 |
Commercial and governmental |  |  | 343,523 |  |  |  | 27,026 |  |  |  | 370,549 |  |  |  | 338,656 |  |  |  | 25,782 |  |  |  | 364,438 |  |  |  | 326,173 |  |  |  | 25,861 |  |  |  | 352,034 |
Industrial |  |  | 109,689 |  |  |  | — |  |  |  | 109,689 |  |  |  | 107,740 |  |  |  | — |  |  |  | 107,740 |  |  |  | 106,756 |  |  |  | — |  |  |  | 106,756 |
Public street and highway lighting |  |  | 7,976 |  |  |  | 267 |  |  |  | 8,243 |  |  |  | 7,483 |  |  |  | 254 |  |  |  | 7,737 |  |  |  | 7,472 |  |  |  | 250 |  |  |  | 7,722 |
Total retail revenue |  |  | 886,446 |  |  |  | 47,525 |  |  |  | 933,971 |  |  |  | 868,702 |  |  |  | 45,703 |  |  |  | 914,405 |  |  |  | 835,118 |  |  |  | 45,051 |  |  |  | 880,169 |
Transmission |  |  | 32,941 |  |  |  | — |  |  |  | 32,941 |  |  |  | 32,307 |  |  |  | — |  |  |  | 32,307 |  |  |  | 21,005 |  |  |  | — |  |  |  | 21,005 |
Other revenue from contracts with customers |  |  | 45,332 |  |  |  | — |  |  |  | 45,332 |  |  |  | 49,920 |  |  |  | — |  |  |  | 49,920 |  |  |  | 33,870 |  |  |  | — |  |  |  | 33,870 |
Total revenue from contracts with customers |  | $ | 964,719 |  |  | $ | 47,525 |  |  | $ | 1,012,244 |  |  | $ | 950,929 |  |  | $ | 45,703 |  |  | $ | 996,632 |  |  | $ | 889,993 |  |  | $ | 45,051 |  |  | $ | 935,044 |
The following table disaggregates revenue from contracts with customers associated with the Company's natural gas operations for the years ended December 31 (dollars in thousands):
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  | Avista Utilities |  |  | Avista Utilities |  |  | Avista Utilities |
NATURAL GAS OPERATIONS |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  |
Residential |  | $ | 325,631 |  |  | $ | 284,452 |  |  | $ | 221,405 |
Commercial |  |  | 164,048 |  |  |  | 139,923 |  |  |  | 100,819 |
Industrial and interruptible |  |  | 17,315 |  |  |  | 10,471 |  |  |  | 7,796 |
Total retail revenue |  |  | 506,994 |  |  |  | 434,846 |  |  |  | 330,020 |
Transportation |  |  | 8,172 |  |  |  | 8,627 |  |  |  | 8,547 |
Other revenue from contracts with customers |  |  | 5,625 |  |  |  | 5,625 |  |  |  | 5,344 |
Total revenue from contracts with customers |  | $ | 520,791 |  |  | $ | 449,098 |  |  | $ | 343,911 |

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