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Shareholders' equity - Accumulated Other Comprehensive Income (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
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 1,505,876 $ 1,479,089 $ 2,377,380 $ 2,344,841 $ 1,479,089 $ 2,344,841
Current period other comprehensive income (loss) (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
AOCI            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 3,001 3,461 (299,151) (289,350) 3,461 (289,350)
Current period other comprehensive income (loss) (306) (460) 1,594 (9,801)    
Ending balance 2,695 3,001 (297,557) (299,151) 2,695 (297,557)
Net unrealized gains (losses) on securities            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   0   (282,963) 0 (282,963)
Current period other comprehensive income (loss)         0 (8,901)
Ending balance 0   (291,864)   0 (291,864)
Unrealized gains (losses) on derivatives            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   2,120   1,638 2,120 1,638
Current period other comprehensive income (loss)         (720) 670
Ending balance 1,400   2,308   1,400 2,308
Retirement benefit plans            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   1,341   (8,025) 1,341 (8,025)
Current period other comprehensive income (loss)         (46) 24
Ending balance 1,295   (8,001)   1,295 (8,001)
Hawaiian Electric Company, Inc. and Subsidiaries            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 1,492,244 1,156,955 2,435,282 2,409,110 1,156,955 2,409,110
Current period other comprehensive income (loss) (47) (47) (46) (49) (94) (95)
Ending balance 1,521,617 1,492,244 1,192,842 2,435,282 1,521,617 1,192,842
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 2,739 2,786 2,800 2,849 2,786 2,849
Current period other comprehensive income (loss) (47) (47) (46) (49)    
Ending balance 2,692 2,739 2,754 2,800 2,692 2,754
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   $ 2,786   $ 2,849 2,786 2,849
Current period other comprehensive income (loss)         (94) (95)
Ending balance $ 2,692   $ 2,754   $ 2,692 $ 2,754