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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 474,631 | $ 462,046
Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 129,704 | 127,464
Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 88,492 | 90,004
Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 25,167 | 24,892
Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,019 | 1,924
Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 245,382 | 244,284
Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 7,947 | 4,685
Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 17,293 | 8,762
Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 270,622 | 257,731
Avista Utilities [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 460,142 | 448,872
Avista Utilities [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 122,823 | 121,003
Avista Utilities [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 81,226 | 83,570
Avista Utilities [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 25,167 | 24,892
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 1,955 | 1,864
Avista Utilities [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 231,171 | 231,329
Avista Utilities [Member] | Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 7,947 | 4,685
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 17,293 | 8,762
Avista Utilities [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 256,411 | 244,776
Avista Utilities [Member] | Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 140,836 | 103,215
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 72,325 | 50,621
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 5,528 | 2,962
Avista Utilities [Member] | Retail Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 218,689 | 156,798
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,269 | 2,357
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 | 1,406 | 1,406
Avista Utilities [Member] | Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 222,364 | 160,561
Avista Utilities [Member] | Revenue from Contracts with Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 478,775 | 405,337
Avista Utilities [Member] | Derivative revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (3,062) | 57,373
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (19,038) | (16,777)
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 417 | 369
Avista Utilities [Member] | Other Utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,050 | 2,570
Alaska Electric Light & Power [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14,363 | 13,054
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 6,881 | 6,461
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 7,266 | 6,434
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 | 64 | 60
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 14,211 | 12,955
Alaska Electric Light & Power [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 14,211 | 12,955
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14,211 | 12,955
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues |  | (48)
Alaska Electric Light & Power [Member] | Other Utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 152 | 147
Corporate and Other [Member] | Other Non-utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 126 | $ 120

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