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Shareholders' equity (Tables)
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
HEI ConsolidatedHawaiian Electric Consolidated
 (in thousands) Net unrealized gains (losses) on securities Unrealized gains (losses) on derivativesRetirement benefit plansAOCIAOCI-Retirement benefit plans
Balance, December 31, 2024$— $2,120 $1,341 $3,461 $2,786 
Current period other comprehensive loss
— (438)(22)(460)(47)
Balance, March 31, 2025$— $1,682 $1,319 $3,001 $2,739 
Balance, December 31, 2023$(282,963)$1,638 $(8,025)$(289,350)$2,849 
Current period other comprehensive income (loss)(10,503)692 10 (9,801)(49)
Balance, March 31, 2024$(293,466)$2,330 $(8,015)$(299,151)$2,800 
Schedule of Reclassification out of AOCI
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended March 31
(in thousands)20252024
HEI consolidated
Amortization of unrealized holding losses on held-to-maturity securities
$— $3,086 
Assets of discontinued operations
Net realized gains on derivatives qualifying as cash flow hedges
(50)(48)Interest expense
Retirement benefit plans:   
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost
(505)(449)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets483 459 
See Note 8 for additional details
Total reclassifications$(72)$3,048  
Hawaiian Electric consolidated
Retirement benefit plans:  
Amortization of prior service credit and net gains recognized during the period in net periodic benefit cost
$(530)$(508)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets483 459 
See Note 8 for additional details
Total reclassifications$(47)$(49)