Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income

Changes in the balances of each component of AOCI were as follows:

	HEI Consolidated								Hawaiian Electric Consolidated
(in thousands)	Net unrealized gains (losses) on securities		Unrealized gains (losses) on derivatives		Retirement benefit plans		AOCI		AOCI-Retirement benefit plans
Balance, December 31, 2020	$	19,986	$	(3,363)	$	(17,887)	$	(1,264)	$	(2,919)
Current period other comprehensive income (loss) and reclassifications, net of taxes	(52,023)		(275)		1,029		(51,269)		(361)
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

Schedule of Reclassifications Out of AOCI

Reclassifications out of AOCI were as follows:

	Amount reclassified from AOCI						Affected line item in the Statement of Income/Balance Sheet
Years ended December 31	2023		2022		2021
(in thousands)
HEI consolidated
Available-for sale investment securities:
Net realized losses (gains) on securities included in net income	$	10,954	$	—	$	(387)	Loss (gain) on sale of investment securities, net and equity-method investment
Amortization of unrealized holding losses on held-to-maturity securities	14,398		3,993		—		Bank revenues
Net realized losses (gains) on derivatives qualifying as cash flow hedges	(186)		172		37		Interest expense
Retirement benefit plans:
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost	(1,560)		19,659		19,253		See Note 11 for additional details
Impact of D&Os of the PUC included in regulatory assets	(8,204)		(199,936)		(171,345)		See Note 11 for additional details
Total reclassifications	$	15,402	$	(176,112)	$	(152,442)
Hawaiian Electric consolidated
Retirement benefit plans:
Amortization of prior service credit and net losses (gains) recognized during the period in net periodic benefit cost	$	(1,983)	$	18,884	$	19,461	See Note 11 for additional details
Impact of D&Os of the PUC included in regulatory assets	(8,204)		(199,936)		(171,345)		See Note 11 for additional details
Total reclassifications	$	(10,187)	$	(181,052)	$	(151,884)