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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating revenues $ 609,416 $ 474,631  
Resource costs 293,117 192,928  
Other operating expenses 111,565 105,989  
Depreciation and amortization 67,930 65,219  
Income (loss) from operations 101,116 76,601  
Interest expense 37,561 35,655  
Income tax expense (benefit) 2,306 (6,628)  
Net income (loss) 71,495 54,845  
Capital expenditures 118,709 100,493  
Total Assets 7,648,984   $ 7,702,477
Operating Segments [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 609,394 474,505  
Resource costs 293,117 192,928  
Other operating expenses 111,249 104,978  
Depreciation and amortization 67,927 65,188  
Income (loss) from operations 101,413 77,517  
Interest expense 37,431 35,526  
Income tax expense (benefit) 2,287 (6,409)  
Net income (loss) 71,419 55,669  
Capital expenditures 118,709 100,490  
Total Assets 7,478,844   7,532,387
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 594,936 460,142  
Resource costs 292,508 192,137  
Other operating expenses 107,315 101,389  
Depreciation and amortization 65,085 62,464  
Income (loss) from operations 94,637 70,559  
Interest expense 36,031 34,074  
Income tax expense (benefit) 800 (7,948)  
Net income (loss) 67,508 51,627  
Capital expenditures 117,244 97,764  
Total Assets 7,206,221   7,262,704
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 14,458 14,363  
Resource costs 609 791  
Other operating expenses 3,934 3,589  
Depreciation and amortization 2,842 2,724  
Income (loss) from operations 6,776 6,958  
Interest expense 1,400 1,452  
Income tax expense (benefit) 1,487 1,539  
Net income (loss) 3,911 4,042  
Capital expenditures 1,465 2,726  
Total Assets 272,623   269,683
Other [Member] | Non-Utility Revenue [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 22 126  
Resource costs 0 0  
Other operating expenses 316 1,011  
Depreciation and amortization 3 31  
Income (loss) from operations (297) (916)  
Interest expense 570 347  
Income tax expense (benefit) 19 (219)  
Net income (loss) 76 (824)  
Capital expenditures 0 3  
Total Assets 192,904   191,665
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating revenues 0 0  
Resource costs 0 0  
Other operating expenses 0 0  
Depreciation and amortization 0 0  
Income (loss) from operations 0 0  
Interest expense (440) (218)  
Income tax expense (benefit) 0 0  
Net income (loss) 0 0  
Capital expenditures 0 $ 0  
Total Assets $ (22,764)   $ (21,575)