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Electric utility segment - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities
Net cash provided by operating activities	$ 124,619	$ 180,952
Cash flows from investing activities
Capital expenditures	(99,550)	(124,297)
Other	(1,568)	2,148
Net cash used in investing activities	(5,592)	(137,468)
Cash flows from financing activities
Common stock dividends	0	(39,446)
Proceeds from issuance of long-term debt	4,673	150,000
Net decrease in short-term borrowings with original maturities of three months or less	0	(88,666)
Other	(8,026)	(5,535)
Net cash provided by (used in) financing activities	(310,878)	71,139
Net increase in cash, cash equivalents and restricted cash	(191,851)	114,623
Cash, cash equivalents and restricted cash, beginning of period	694,574	204,927
Cash, cash equivalents and restricted cash, end of period	502,723	319,550
Less: Restricted cash	(17,531)	(4,216)	$ (15,028)
Cash and cash equivalents	485,192	315,334	679,546
Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	127,201	169,355
Cash flows from investing activities
Capital expenditures	(98,032)	(122,139)
Advanced (to) from affiliates	0	0
Other	(1,641)	1,545
Net cash used in investing activities	(99,673)	(120,594)
Cash flows from financing activities
Common stock dividends	0	(32,250)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(499)	(499)
Proceeds from issuance of long-term debt	0	150,000
Net decrease in short-term borrowings with original maturities of three months or less	0	(87,967)
Payments of obligations under finance leases	(1,800)	(575)
Other	(1,552)	(690)
Net cash provided by (used in) financing activities	(3,851)	28,019
Net increase in cash, cash equivalents and restricted cash	23,677	76,780
Cash, cash equivalents and restricted cash, beginning of period	108,077	39,242
Cash, cash equivalents and restricted cash, end of period	131,754	116,022
Less: Restricted cash	(2,000)	0	(2,000)
Cash and cash equivalents	129,754	116,022	106,077
Consolidating adjustments | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	0	(8,150)
Cash flows from investing activities
Capital expenditures	0	0
Advanced (to) from affiliates	22,500	(26,200)
Other	0	0
Net cash used in investing activities	22,500	(26,200)
Cash flows from financing activities
Common stock dividends		8,150
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from issuance of long-term debt		0
Net decrease in short-term borrowings with original maturities of three months or less	(22,500)	26,200
Payments of obligations under finance leases		0
Other	0	0
Net cash provided by (used in) financing activities	(22,500)	34,350
Net increase in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash, beginning of period	0	0
Cash, cash equivalents and restricted cash, end of period	0
Less: Restricted cash	0		0
Cash and cash equivalents	0	0	0
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	103,556	143,356
Cash flows from investing activities
Capital expenditures	(55,261)	(74,916)
Advanced (to) from affiliates	(22,500)	0
Other	(1,093)	1,094
Net cash used in investing activities	(78,854)	(73,822)
Cash flows from financing activities
Common stock dividends		(32,250)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(499)	(270)
Proceeds from issuance of long-term debt		100,000
Net decrease in short-term borrowings with original maturities of three months or less	0	(114,167)
Payments of obligations under finance leases	(1,646)	(575)
Other	(1,112)	(458)
Net cash provided by (used in) financing activities	(3,257)	(47,720)
Net increase in cash, cash equivalents and restricted cash	21,445	21,814
Cash, cash equivalents and restricted cash, beginning of period	91,755	27,579
Cash, cash equivalents and restricted cash, end of period	113,200
Less: Restricted cash	(2,000)		(2,000)
Cash and cash equivalents	111,200	49,393	89,755
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	15,965	18,733
Cash flows from investing activities
Capital expenditures	(14,954)	(20,747)
Advanced (to) from affiliates	0	4,500
Other	(240)	153
Net cash used in investing activities	(15,194)	(16,094)
Cash flows from financing activities
Common stock dividends		(4,475)
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	(134)
Proceeds from issuance of long-term debt		25,000
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Payments of obligations under finance leases	(154)	0
Other	(129)	(116)
Net cash provided by (used in) financing activities	(283)	20,275
Net increase in cash, cash equivalents and restricted cash	488	22,914
Cash, cash equivalents and restricted cash, beginning of period	10,658	5,092
Cash, cash equivalents and restricted cash, end of period	11,146
Less: Restricted cash	0		0
Cash and cash equivalents	11,146	28,006	10,658
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	7,680	15,416
Cash flows from investing activities
Capital expenditures	(27,817)	(26,476)
Advanced (to) from affiliates	0	21,700
Other	(308)	298
Net cash used in investing activities	(28,125)	(4,478)
Cash flows from financing activities
Common stock dividends		(3,675)
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	(95)
Proceeds from issuance of long-term debt		25,000
Net decrease in short-term borrowings with original maturities of three months or less	22,500	0
Payments of obligations under finance leases	0	0
Other	(311)	(116)
Net cash provided by (used in) financing activities	22,189	21,114
Net increase in cash, cash equivalents and restricted cash	1,744	32,052
Cash, cash equivalents and restricted cash, beginning of period	5,587	6,494
Cash, cash equivalents and restricted cash, end of period	7,331
Less: Restricted cash	0		0
Cash and cash equivalents	7,331	38,546	5,587
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	0	0
Cash flows from investing activities
Capital expenditures	0	0
Advanced (to) from affiliates	0	0
Other	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities
Common stock dividends		0
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from issuance of long-term debt		0
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Payments of obligations under finance leases		0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Net increase in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash, beginning of period	77	77
Cash, cash equivalents and restricted cash, end of period	77
Less: Restricted cash	0		0
Cash and cash equivalents	$ 77	$ 77	$ 77

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