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Shareholders' equity
 6 Months Ended
Jun. 30, 2025
Equity [Abstract]  
Shareholders' equity Shareholders' equity
Accumulated other comprehensive income/(loss).  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 $2,786 
Current period other comprehensive loss
— (720)(46)(766)(94)
Balance, June 30, 2025$— $1,400 $1,295 $2,695 $2,692 
Balance, December 31, 2023$(282,963)$1,638 $(8,025)$(289,350)$2,849 
Current period other comprehensive income (loss)(8,901)670 24 (8,207)(95)
Balance, June 30, 2024$(291,864)$2,308 $(8,001)$(297,557)$2,754 
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended June 30Six months ended June 30
(in thousands)2025202420252024
HEI consolidated
Amortization of unrealized holding losses on held-to-maturity securities
$— $3,288 $— $6,374 
Assets of discontinued operations
Net realized gains on derivatives qualifying as cash flow hedges
(50)(51)(100)(99)Interest expense
Retirement benefit plans:     
Amortization of net gains recognized during the period in net periodic benefit cost(508)(445)(1,013)(894)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets484 459 967 918 
See Note 8 for additional details
Total reclassifications$(74)$3,251 $(146)$6,299  
Hawaiian Electric consolidated
Retirement benefit plans:   
Amortization of net gains recognized during the period in net periodic benefit cost$(531)$(505)$(1,061)$(1,013)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets484 459 967 918 
See Note 8 for additional details
Total reclassifications$(47)$(46)$(94)$(95)