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Shareholders' equity
 9 Months Ended
Sep. 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 $2,786 
Current period other comprehensive loss
— (1,466)(34)(1,500)(118)
Balance, September 30, 2025$— $654 $1,307 $1,961 $2,668 
Balance, December 31, 2023$(282,963)$1,638 $(8,025)$(289,350)$2,849 
Current period other comprehensive income (loss)31,260 (220)113 31,153 (93)
Balance, September 30, 2024$(251,703)$1,418 $(7,912)$(258,197)$2,756 
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the
 Statements of Income / Balance Sheets
Three months ended September 30Nine months ended September 30
(in thousands)2025202420252024
HEI consolidated
Amortization of unrealized holding losses on held-to-maturity securities
$— $3,366 $— $9,740 
Assets of discontinued operations
Net realized gains on derivatives qualifying as cash flow hedges
(877)(52)(977)(151)
Interest expense and gain on sale of subsidiaries
Retirement benefit plans:     
Amortization of net gains recognized during the period in net periodic benefit cost(540)(1,244)(1,553)(2,138)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets552 1,333 1,519 2,251 
See Note 8 for additional details
Total reclassifications$(865)$3,403 $(1,011)$9,702  
Hawaiian Electric consolidated
Retirement benefit plans:   
Amortization of net gains recognized during the period in net periodic benefit cost$(576)$(1,331)$(1,637)$(2,344)
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets552 1,333 1,519 2,251 
See Note 8 for additional details
Total reclassifications$(24)$2 $(118)$(93)