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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Alternative revenue programs | $ 2,883 | $ (19,038)
Total utility revenues | 609,394 | 474,505
Non-utility revenues | 22 | 126
Total operating revenues | 609,416 | 474,631
Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 149,183 | 129,704
Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 99,874 | 88,492
Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 28,066 | 25,167
Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,230 | 2,019
Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 279,353 | 245,382
Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 9,592 | 7,947
Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 16,061 | 17,293
Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 305,006 | 270,622
Avista Utilities [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 499,382 | 478,775
Derivative revenues | 89,580 | (3,062)
Alternative revenue programs | 2,883 | (19,038)
Deferrals and amortizations for rate refunds to customers | 365 | 417
Other utility revenues | 2,726 | 3,050
Total utility revenues | 594,936 | 460,142
Avista Utilities [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 142,029 | 122,823
Avista Utilities [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 92,792 | 81,226
Avista Utilities [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 28,066 | 25,167
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,164 | 1,955
Avista Utilities [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 265,051 | 231,171
Avista Utilities [Member] | Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 9,592 | 7,947
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 16,061 | 17,293
Avista Utilities [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 290,704 | 256,411
Avista Utilities [Member] | Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 132,970 | 140,836
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 67,999 | 72,325
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 3,965 | 5,528
Avista Utilities [Member] | Retail Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 204,934 | 218,689
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,338 | 2,269
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 | 208,678 | 222,364
Alaska Electric Light & Power [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 14,302 | 14,211
Other utility revenues | 156 | 152
Total utility revenues | 14,458 | 14,363
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,154 | 6,881
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7,082 | 7,266
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 66 | 64
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 14,302 | 14,211
Alaska Electric Light & Power [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 14,302 | 14,211
Corporate and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Non-utility revenues | $ 22 | $ 126

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Data Type: | na
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