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Shareholders' equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,479,089 $ 2,344,841
Current period other comprehensive income (loss) (460) (9,801)
Ending balance 1,505,876 2,377,380
AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 3,461 (289,350)
Current period other comprehensive income (loss) (460) (9,801)
Ending balance 3,001 (299,151)
Net unrealized gains (losses) on securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0 (282,963)
Current period other comprehensive income (loss) 0 (10,503)
Ending balance 0 (293,466)
Unrealized gains (losses) on derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 2,120 1,638
Current period other comprehensive income (loss) (438) 692
Ending balance 1,682 2,330
Retirement benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1,341 (8,025)
Current period other comprehensive income (loss) (22) 10
Ending balance 1,319 (8,015)
Hawaiian Electric Company, Inc. and Subsidiaries    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1,156,955 2,409,110
Current period other comprehensive income (loss) (47) (49)
Ending balance 1,492,244 2,435,282
Hawaiian Electric Company, Inc. and Subsidiaries | AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 2,786 2,849
Current period other comprehensive income (loss) (47) (49)
Ending balance 2,739 2,800
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 2,786 2,849
Current period other comprehensive income (loss) (47) (49)
Ending balance $ 2,739 $ 2,800