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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 379,937 | $ 378,566 | $ 854,568 | $ 840,612
Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 90,917 | 88,264 | 220,621 | 215,728
Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 87,890 | 86,764 | 176,382 | 176,768
Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,956 | 27,253 | 53,123 | 52,145
Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 2,041 | 1,971 | 4,060 | 3,895
Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 208,804 | 204,252 | 454,186 | 448,536
Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 8,475 | 8,417 | 16,422 | 13,102
Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,934 | 7,409 | 24,227 | 16,171
Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 224,213 | 220,078 | 494,835 | 477,809
Avista Utilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 368,604 | 368,515 | 828,746 | 817,387
Avista Utilities [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 86,499 | 84,108 | 209,322 | 205,111
Avista Utilities [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 81,346 | 80,713 | 162,572 | 164,283
Avista Utilities [Member] | Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,956 | 27,253 | 53,123 | 52,145
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,980 | 1,912 | 3,935 | 3,776
Avista Utilities [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 197,781 | 193,986 | 428,952 | 425,315
Avista Utilities [Member] | Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 8,475 | 8,417 | 16,422 | 13,102
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,934 | 7,409 | 24,227 | 16,171
Avista Utilities [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 213,190 | 209,812 | 469,601 | 454,588
Avista Utilities [Member] | Residential Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 48,004 | 48,480 | 188,840 | 151,695
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 25,477 | 23,736 | 97,802 | 74,357
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,128 | 2,346 | 9,656 | 5,308
Avista Utilities [Member] | Retail Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 77,609 | 74,562 | 296,298 | 231,360
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,923 | 2,142 | 4,192 | 4,499
Avista Utilities [Member] | Other Natural Gas Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,407 | 1,406 | 2,813 | 2,812
Avista Utilities [Member] | Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 80,939 | 78,110 | 303,303 | 238,671
Avista Utilities [Member] | Revenue from Contracts with Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 294,129 | 287,922 | 772,904 | 693,259
Avista Utilities [Member] | Derivative revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 66,580 | 84,403 | 63,518 | 141,776
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,513 | (5,793) | (13,525) | (22,570)
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 228 | (500) | 645 | (131)
Avista Utilities [Member] | Other Utility Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,154 | 2,483 | 5,204 | 5,053
Alaska Electric Light & Power [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,194 | 9,906 | 25,557 | 22,960
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,418 | 4,156 | 11,299 | 10,617
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,544 | 6,051 | 13,810 | 12,485
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 61 | 59 | 125 | 119
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 11,023 | 10,266 | 25,234 | 23,221
Alaska Electric Light & Power [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 11,023 | 10,266 | 25,234 | 23,221
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,023 | 10,266 | 25,234 | 23,221
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues |  | (517) |  | (565)
Alaska Electric Light & Power [Member] | Other Utility Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 171 | 157 | 323 | 304
Corporate and Other [Member] | Other Utility Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 139 | $ 145 | $ 265 | $ 265

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