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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