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Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]    
Construction work-in-progress (CWIP) and other $ 179,527 $ 164,147
Total 7,979,008 7,725,835
Other Property 393,985 365,085
Total 7,985,433 7,742,466
Avista Utilities [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Total 7,786,150 7,545,007
Common Plant 759,498 744,173
Avista Utilities [Member] | Electricity [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Production 1,498,398 1,593,795
Transmission 1,059,389 994,709
Distribution 2,383,201 2,236,376
Construction work-in-progress (CWIP) and other 394,711 376,981
Total 5,335,699 5,201,861
Avista Utilities [Member] | Natural Gas [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Distribution 1,539,467 1,452,637
Construction work-in-progress (CWIP) and other 91,492 88,264
Total 1,690,953 1,598,973
Natural gas underground storage 59,994 58,072
Alaska Electric Light & Power [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Total 192,858 180,828
Common Plant 10,340 10,018
Alaska Electric Light & Power [Member] | Electricity [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Production 118,817 106,390
Transmission 22,827 22,856
Distribution 32,322 29,269
Construction work-in-progress (CWIP) and other 8,552 12,295
Total 182,518 170,810
Corporate and Other [Member]    
Public Utility, Property, Plant and Equipment [Line Items]    
Other Property $ 6,425 $ 16,631