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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Alternative revenue programs $ 3,978 $ 3,578 $ 23,032 $ (9,947)
Total utility revenues 393,565 379,524 1,404,991 1,233,827
Non-utility revenues 177 102 239 367
Total operating revenues 393,742 379,626 1,405,230 1,234,194
Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 113,772 99,067 360,312 319,688
Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 103,702 96,219 295,344 272,601
Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 36,910 29,584 95,014 82,707
Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2,255 2,072 6,802 6,132
Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 256,639 226,942 757,472 681,128
Transmission Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 9,250 7,721 28,380 24,143
Other Electric Revenues from Contracts With Customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 8,062 9,353 32,457 33,580
Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 273,951 244,016 818,309 738,851
Avista Utilities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 318,171 285,821 1,136,926 1,058,725
Derivative revenues 56,462 77,562 194,647 141,080
Alternative revenue programs 3,978 3,578 23,032 (9,947)
Other utility revenues 5,135 2,712 14,891 8,561
Total utility revenues 383,746 369,673 1,369,496 1,198,419
Avista Utilities [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 110,328 95,881 345,166 305,203
Avista Utilities [Member] | Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 97,389 89,772 275,525 252,344
Avista Utilities [Member] | Industrial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 36,910 29,584 95,014 82,707
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2,186 2,005 6,604 5,940
Avista Utilities [Member] | Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 246,813 217,242 722,309 646,194
Avista Utilities [Member] | Transmission Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 9,250 7,721 28,380 24,143
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 8,062 9,353 32,457 33,580
Avista Utilities [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 264,125 234,316 783,146 703,917
Avista Utilities [Member] | Residential Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 30,285 29,372 217,682 218,212
Avista Utilities [Member] | Commercial Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 17,203 15,381 114,495 113,183
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2,720 3,480 9,880 13,136
Avista Utilities [Member] | Retail Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 50,208 48,233 342,057 344,531
Avista Utilities [Member] | Transportation Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 2,432 1,866 7,504 6,058
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 4,219 4,219
Avista Utilities [Member] | Natural Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer including assessed tax 54,046 51,505 353,780 354,808
Alaska Electric Light & Power [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,826 9,700 35,163 34,934
Deferrals and amortizations for rate refunds to customers (183)   (183)  
Other utility revenues 176 151 515 474
Total utility revenues 9,819 9,851 35,495 35,408
Alaska Electric Light & Power [Member] | Residential Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,444 3,186 15,146 14,485
Alaska Electric Light & Power [Member] | Commercial Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6,313 6,447 19,819 20,257
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 69 67 198 192
Alaska Electric Light & Power [Member] | Retail Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,826 9,700 35,163 34,934
Alaska Electric Light & Power [Member] | Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,826 9,700 35,163 34,934
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Non-utility revenues $ 177 $ 102 $ 239 $ 367