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Shareholders' equity - Reclassification out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications $ (72) $ 3,048
Hawaiian Electric Company, Inc. and Subsidiaries    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (48,315) (39,720)
Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (47) (49)
Amortization of unrealized holding losses on held-to-maturity securities | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Assets of discontinued operations 0 3,086
Net realized gains on derivatives qualifying as cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Interest expense (50) (48)
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (505) (449)
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications (530) (508)
Impact of D&Os of the PUC included in regulatory assets | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications 483 459
Impact of D&Os of the PUC included in regulatory assets | Hawaiian Electric Company, Inc. and Subsidiaries | Reclassification out of Accumulated Other Comprehensive Income    
Reclassifications out of accumulated other comprehensive income/(loss)    
Total reclassifications $ 483 $ 459