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Information by Business Segments - Schedule of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Operating revenues $ 393,742 $ 379,626 $ 1,405,230 $ 1,234,194  
Resource costs 142,033 148,282 579,476 482,454  
Other operating expenses 107,614 103,072 329,128 312,881  
Depreciation and amortization 67,889 66,905 203,650 198,272  
Income (loss) from operations 48,768 38,087 204,140 158,496  
Interest expense 37,326 35,484 111,467 106,765  
Income tax expense (benefit) (478) (3,786) 2,323 (16,224)  
Net income (loss) 18,487 14,716 112,840 87,045  
Capital expenditures 154,221 132,531 405,428 359,277  
Total Assets 7,780,883   7,780,883   $ 7,702,477
Operating Segments [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 393,565 379,524 1,404,991 1,233,827  
Resource costs 142,033 148,282 579,476 482,454  
Other operating expenses 107,298 102,469 328,138 310,518  
Depreciation and amortization 67,886 66,860 203,642 198,196  
Income (loss) from operations 48,910 38,633 204,899 160,568  
Interest expense 37,195 35,352 111,076 106,374  
Income tax expense (benefit) (101) (3,809) 3,274 (15,301)  
Net income (loss) 19,844 13,786 116,307 89,624  
Capital expenditures 154,221 132,531 405,428 359,277  
Total Assets 7,612,787   7,612,787   7,532,387
Operating Segments [Member] | Avista Utilities [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 383,746 369,673 1,369,496 1,198,419  
Resource costs 140,669 146,793 576,302 478,947  
Other operating expenses 103,106 98,609 315,953 299,274  
Depreciation and amortization 65,024 64,125 195,082 190,008  
Income (loss) from operations 47,738 37,081 194,127 148,897  
Interest expense 35,762 33,896 106,828 102,014  
Income tax expense (benefit) (39) (3,845) 1,475 (17,349)  
Net income (loss) 19,803 13,498 111,246 83,935  
Capital expenditures 143,938 127,666 389,098 347,264  
Total Assets 7,336,820   7,336,820   7,262,704
Operating Segments [Member] | Alaska Electric Light & Power [Member] | Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 9,819 9,851 35,495 35,408  
Resource costs 1,364 1,489 3,174 3,507  
Other operating expenses 4,192 3,860 12,185 11,244  
Depreciation and amortization 2,862 2,735 8,560 8,188  
Income (loss) from operations 1,172 1,552 10,772 11,671  
Interest expense 1,433 1,456 4,248 4,360  
Income tax expense (benefit) (62) 36 1,799 2,048  
Net income (loss) 41 288 5,061 5,689  
Capital expenditures 10,283 4,865 16,330 12,013  
Total Assets 275,967   275,967   269,683
Other [Member] | Non-Utility Revenue [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 177 102 239 367  
Resource costs 0 0 0 0  
Other operating expenses 316 603 990 2,363  
Depreciation and amortization 3 45 8 76  
Income (loss) from operations (142) (546) (759) (2,072)  
Interest expense 674 538 1,886 1,333  
Income tax expense (benefit) (377) 23 (951) (923)  
Net income (loss) (1,357) 930 (3,467) (2,579)  
Capital expenditures 0 0 0 0  
Total Assets 194,801   194,801   191,665
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Operating revenues 0 0 0 0  
Resource costs 0 0 0 0  
Other operating expenses 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Income (loss) from operations 0 0 0 0  
Interest expense (543) (406) (1,495) (942)  
Income tax expense (benefit) 0 0 0 0  
Net income (loss) 0 0 0 0  
Capital expenditures 0 $ 0 0 $ 0  
Total Assets $ (26,705)   $ (26,705)   $ (21,575)