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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,438,936 | $ 1,321,891 | $ 1,345,622
Residential Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 413,657 | 396,403 | 386,236
Commercial and Governmental Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 352,034 | 327,726 | 336,980
Industrial Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 106,756 | 103,103 | 105,802
Public Street and Highway Lighting Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 7,722 | 7,555 | 7,702
Retail Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 880,169 | 834,787 | 836,720
Transmission Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 21,005 | 18,236 | 18,180
Other Electric Revenues from Contracts With Customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 33,870 | 19,252 | 26,969
Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 935,044 | 872,275 | 881,869
Avista Utilities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,392,999 | 1,277,468 | 1,295,873
Avista Utilities [Member] | Residential Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 394,717 | 377,785 | 369,102
Avista Utilities [Member] | Commercial and Governmental Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 326,173 | 303,972 | 317,589
Avista Utilities [Member] | Industrial Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 106,756 | 103,103 | 105,802
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 7,472 | 7,303 | 7,448
Avista Utilities [Member] | Retail Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 835,118 | 792,163 | 799,941
Avista Utilities [Member] | Transmission Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 21,005 | 18,236 | 18,180
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 33,870 | 19,252 | 26,969
Avista Utilities [Member] | Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 889,993 | 829,651 | 845,090
Avista Utilities [Member] | Residential Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 221,405 | 213,612 | 196,430
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 100,819 | 94,937 | 92,168
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 7,796 | 7,128 | 5,263
Avista Utilities [Member] | Retail Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 330,020 | 315,677 | 293,861
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 8,547 | 7,917 | 8,674
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 | 5,344 | 4,501 | 4,500
Avista Utilities [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 343,911 | 328,095 | 307,035
Avista Utilities [Member] | Revenue from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,233,904 | 1,157,746 | 1,152,125
Avista Utilities [Member] | Derivative revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 152,590 | 110,313 | 118,741
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (6,635) | (3,814) | 9,614
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,984 | 5,335 | 4,509
Avista Utilities [Member] | Other Utility Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 10,156 | 7,888 | 10,884
Alaska Electric Light & Power [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45,366 | 42,809 | 37,265
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 18,940 | 18,618 | 17,134
Alaska Electric Light & Power [Member] | Commercial and Governmental Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 25,861 | 23,754 | 19,391
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 | 250 | 252 | 254
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 45,051 | 42,624 | 36,779
Alaska Electric Light & Power [Member] | Electric [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customer including assessed tax | 45,051 | 42,624 | 36,779
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45,051 | 42,624 | 36,779
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (190) | (190) | (190)
Alaska Electric Light & Power [Member] | Other Utility Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 505 | 375 | 676
Corporate and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 571 | 1,614 | 12,484
Corporate and Other [Member] | Revenue from Contracts with Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2 | 564 | 11,286
Corporate and Other [Member] | Other Revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 569 | $ 1,050 | $ 1,198

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