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Shareholders' equity
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Shareholders' equity
Note 8 · Shareholders’ equity
Reserved shares.  As of December 31, 2024, HEI had a total of 27.5 million of authorized and unissued shares of common stock available for future issuance under the HEI Dividend Reinvestment and Stock Purchase Plan (DRIP), the Hawaiian Electric Industries Retirement Savings Plan (HEIRSP), the HEI 2011 Nonemployee Director Stock Plan, the 2010 Equity and Incentive Plan, as amended, and at-the-market offering program.
Accumulated other comprehensive income/(loss).  Changes in the balances of each component of 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, 2021$(32,037)$(3,638)$(16,858)$(52,533)$(3,280)
Current period other comprehensive income (loss) and reclassifications, net of taxes
(296,867)5,629 7,743 (283,495)6,141 
Balance, December 31, 2022(328,904)1,991 (9,115)(336,028)2,861 
Current period other comprehensive income (loss) and reclassifications, net of taxes
45,941 (353)1,090 46,678 (12)
Balance, December 31, 2023(282,963)1,638 (8,025)(289,350)2,849 
Current period other comprehensive income (loss) and reclassifications, net of taxes
1,785 482 917 3,184 (63)
Discontinued operations
281,178 — 8,449 289,627 — 
Balance, December 31, 2024$— $2,120 $1,341 $3,461 $2,786 
Reclassifications out of AOCI were as follows:
 Amount reclassified from AOCIAffected line item in the Statement of
Income/Balance Sheet
Years ended December 31202420232022
(in thousands)
HEI consolidated
Available-for sale investment securities:
Net realized losses on securities included in net income
$— $10,954 $— 
Assets of discontinued operations
Amortization of unrealized holding losses on held-to-maturity securities13,012 14,398 3,993 
Income (loss) from discontinued operations
Net realized losses (gains) on derivatives qualifying as cash flow hedges
(201)(186)172 Interest expense
Retirement benefit plans:    
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost
(1,730)(1,560)19,659 
See Note 11 for additional details
Impact of D&Os of the PUC included in regulatory assets(63,708)(8,204)(199,936)
See Note 11 for additional details
Total reclassifications$(52,627)$15,402 $(176,112) 
Hawaiian Electric consolidated
Retirement benefit plans:    
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost
$(2,035)$(1,983)$18,884 
See Note 11 for additional details
Impact of D&Os of the PUC included in regulatory assets(63,708)(8,204)(199,936)
See Note 11 for additional details
Total reclassifications$(65,743)$(10,187)$(181,052)