v3.26.1
Segment financial information - Schedule of Segment Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment financial information          
Revenues $ 939,703 $ 746,392 $ 1,686,150 $ 1,490,462  
Depreciation and amortization 75,366 76,105 150,813 152,667  
Interest and dividend income 5,284 7,579 15,279 20,202  
Interest income   7,579   20,202  
Interest expense, net 48,383 27,256 79,511 61,468  
Income (loss) before income taxes 164,662 39,975 203,254 73,514  
Income tax expense (benefit) 41,462 13,417 49,604 19,812  
Net income 123,200 26,558 153,650 53,702  
Preferred stock dividends of Hawaiian Electric 0 473 0 946  
Net income for common stock 123,200 26,085 153,650 52,756  
Capital expenditures     242,090 161,493  
Total assets 8,401,802   8,401,802   $ 8,922,879
All other          
Segment financial information          
Revenues 2,839 3,910 5,246 9,614  
Depreciation and amortization 188 2,474 373 5,483  
Interest and dividend income 2,571   8,698    
Interest income   6,364   17,006  
Interest expense, net 3,032 5,550 6,284 17,310  
Income (loss) before income taxes (18,697) (10,294) (25,149) (38,274)  
Income tax expense (benefit) (4,039) 2,797 (5,598) (4,012)  
Net income   (13,091)   (34,262)  
Preferred stock dividends of Hawaiian Electric   (26)   (52)  
Net income for common stock (14,658) (13,065) (19,551) (34,210)  
Capital expenditures     280 1,543  
Total assets 231,912   231,912   392,359
Electric utility          
Segment financial information          
Revenues 936,864 742,482 1,680,904 1,480,848  
Electric utility | Operating Segments          
Segment financial information          
Revenues 936,864 742,482 1,680,904 1,480,848  
Depreciation and amortization 75,178 73,631 150,440 147,184  
Interest and dividend income 2,713   6,581    
Interest income   1,215   3,196  
Interest expense, net 45,351 21,706 73,227 44,158  
Income (loss) before income taxes 183,359 50,269 228,403 111,788  
Income tax expense (benefit) 45,501 10,620 55,202 23,824  
Net income   39,649   87,964  
Preferred stock dividends of Hawaiian Electric   499   998  
Net income for common stock 137,858 $ 39,150 173,201 86,966  
Capital expenditures     241,810 $ 159,950  
Total assets $ 8,169,890   $ 8,169,890   $ 8,530,520