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Segment financial information - Segment Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment financial information      
Revenues $ 744,070 $ 792,014  
Income (loss) from continuing operations before income taxes 33,539 28,456  
Income taxes (benefit) 6,395 6,795  
Income from continuing operations for common stock 27,144 21,661  
Preferred stock dividends of Hawaiian Electric 473 473  
Income from continuing operations for common stock 26,671 21,188  
Total assets 8,766,181   $ 8,931,416
All other      
Segment financial information      
Revenues 5,704 3,436  
Income (loss) from continuing operations before income taxes (27,980) (22,444)  
Income taxes (benefit) (6,809) (4,385)  
Income from continuing operations for common stock (21,171) (18,059)  
Preferred stock dividends of Hawaiian Electric (26) (26)  
Income from continuing operations for common stock (21,145) (18,033)  
Total assets 902,037   1,317,812
Electric utility | Operating Segments      
Segment financial information      
Revenues 738,366 788,578  
Income (loss) from continuing operations before income taxes 61,519 50,900  
Income taxes (benefit) 13,204 11,180  
Income from continuing operations for common stock 48,315 39,720  
Preferred stock dividends of Hawaiian Electric 499 499  
Income from continuing operations for common stock 47,816 $ 39,221  
Total assets $ 7,864,144   $ 7,613,604