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Electric utility segment - Condensed Consolidating Statement of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Increase (decrease) in stockholders' equity            
Beginning balance $ 1,505,876 $ 1,479,089 $ 2,377,380 $ 2,344,841 $ 1,479,089 $ 2,344,841
Net income (loss) for common stock 26,085 26,671 (1,295,484) 42,122    
Other comprehensive loss, net of taxes (306) (460) 1,594 (9,801) (766) (8,207)
Ending balance 1,534,432 1,505,876 1,085,273 2,377,380 1,534,432 1,085,273
Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance 1,492,244 1,156,955 2,435,282 2,409,110 1,156,955 2,409,110
Net income (loss) for common stock 39,150 47,816 (1,229,394) 39,221 86,966 (1,190,173)
Other comprehensive loss, net of taxes (47) (47) (46) (49) (94) (95)
Common stock dividends (10,000)   (13,000) (13,000) (10,000) (26,000)
Additional paid-in capital 270 287,520     287,790  
Ending balance 1,521,617 1,492,244 1,192,842 2,435,282 1,521,617 1,192,842
Consolidating adjustments | Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance   (680,414)   (722,211) (680,414) (722,211)
Net income (loss) for common stock         (17,492) 240,075
Other comprehensive loss, net of taxes 13   11   31 24
Additional paid-in capital         (458)  
Ending balance (698,333)   (482,112)   (698,333) (482,112)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance   1,156,955   2,409,110 1,156,955 2,409,110
Net income (loss) for common stock         86,966 (1,190,173)
Other comprehensive loss, net of taxes (47)   (46)   (94) (95)
Common stock dividends         (10,000) (26,000)
Additional paid-in capital         287,790  
Ending balance 1,521,617   1,192,842   1,521,617 1,192,842
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance   243,964   359,790 243,964 359,790
Net income (loss) for common stock         9,296 (115,905)
Other comprehensive loss, net of taxes (4)   (4)   (11) (7)
Additional paid-in capital         267  
Ending balance 253,516   243,878   253,516 243,878
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance   282,876   362,344 282,876 362,344
Net income (loss) for common stock         5,537 (124,170)
Other comprehensive loss, net of taxes (9)   (7)   (20) (17)
Additional paid-in capital         191  
Ending balance 288,584   238,157   288,584 238,157
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated            
Increase (decrease) in stockholders' equity            
Beginning balance   $ 153,574   $ 77 153,574 77
Net income (loss) for common stock         2,659  
Other comprehensive loss, net of taxes 0   0   0 0
Ending balance $ 156,233   $ 77   $ 156,233 $ 77