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Electric utility segment - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Cash flows from operating activities
Net cash provided by operating activities	$ 49,665	$ 124,619
Cash flows from investing activities
Capital expenditures	(86,538)	(98,882)
Other	2,264	(1,611)
Net cash used in investing activities	(78,493)	(5,592)
Cash flows from financing activities
Repayment of long-term debt	(98,067)	(8,268)
Other	(3,488)	(3,478)
Net cash used in financing activities	(102,206)	(310,878)
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	(131,034)	(191,851)
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	1,242,852	694,574
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period	1,111,818	502,723
Less: Restricted cash	(482,480)	(17,531)
Cash and cash equivalents	629,338	258,252	$ 750,535
Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	79,014	127,201
Cash flows from investing activities
Capital expenditures	(85,126)	(98,032)
Advanced (to) from affiliates	0	0
Other	980	(1,641)
Net cash used in investing activities	(84,146)	(99,673)
Cash flows from financing activities
Preferred stock dividends of Hawaiian Electric and subsidiaries	(499)	(499)
Proceeds from capital contribution from parent	270	0
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Repayment of long-term debt	(45,000)	0
Payments of obligations under finance leases	(2,312)	(1,800)
Other	(1,049)	(1,552)
Net cash used in financing activities	(48,590)	(3,851)
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	(53,722)	23,677
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	184,148	108,077
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period	130,426	131,754
Less: Restricted cash	0	(2,000)
Cash and cash equivalents	130,426	129,754	184,148
Consolidating adjustments | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	(233)	0
Cash flows from investing activities
Capital expenditures	0	0
Advanced (to) from affiliates	14,000	22,500
Other	233	0
Net cash used in investing activities	14,233	22,500
Cash flows from financing activities
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from capital contribution from parent	0
Net decrease in short-term borrowings with original maturities of three months or less	(14,000)	(22,500)
Repayment of long-term debt	0
Payments of obligations under finance leases	0
Other	0	0
Net cash used in financing activities	(14,000)	(22,500)
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	0	0
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	0	0
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period		0
Less: Restricted cash		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	63,617	103,556
Cash flows from investing activities
Capital expenditures	(45,122)	(55,261)
Advanced (to) from affiliates	(14,000)	(22,500)
Other	582	(1,093)
Net cash used in investing activities	(58,540)	(78,854)
Cash flows from financing activities
Preferred stock dividends of Hawaiian Electric and subsidiaries	(499)	(499)
Proceeds from capital contribution from parent	270
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Repayment of long-term debt	(45,000)
Payments of obligations under finance leases	(1,972)	(1,646)
Other	(752)	(1,112)
Net cash used in financing activities	(47,953)	(3,257)
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	(42,876)	21,445
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	118,367	91,755
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period		113,200
Less: Restricted cash		(2,000)
Cash and cash equivalents	75,491	111,200	118,367
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	10,929	15,965
Cash flows from investing activities
Capital expenditures	(13,854)	(14,954)
Advanced (to) from affiliates	0	0
Other	164	(240)
Net cash used in investing activities	(13,690)	(15,194)
Cash flows from financing activities
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from capital contribution from parent	0
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Repayment of long-term debt	0
Payments of obligations under finance leases	(163)	(154)
Other	(87)	(129)
Net cash used in financing activities	(250)	(283)
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	(3,011)	488
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	31,534	10,658
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period		11,146
Less: Restricted cash		0
Cash and cash equivalents	28,523	11,146	31,534
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	2,090	7,680
Cash flows from investing activities
Capital expenditures	(26,150)	(27,817)
Advanced (to) from affiliates	0	0
Other	1	(308)
Net cash used in investing activities	(26,149)	(28,125)
Cash flows from financing activities
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from capital contribution from parent	0
Net decrease in short-term borrowings with original maturities of three months or less	14,000	22,500
Repayment of long-term debt	0
Payments of obligations under finance leases	(177)	0
Other	(210)	(311)
Net cash used in financing activities	13,613	22,189
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	(10,446)	1,744
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	16,456	5,587
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period		7,331
Less: Restricted cash		0
Cash and cash equivalents	6,010	7,331	16,456
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	2,611	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
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Proceeds from capital contribution from parent	0
Net decrease in short-term borrowings with original maturities of three months or less	0	0
Repayment of long-term debt	0
Payments of obligations under finance leases	0
Other	0	0
Net cash used in financing activities	0	0
Net decrease in cash, cash equivalents and restricted cash, including cash from discontinued operations	2,611	0
Cash, cash equivalents and restricted cash, including cash from discontinued operations, beginning of period	17,791	77
Cash, cash equivalents and restricted cash, including cash from discontinued operations, end of period		77
Less: Restricted cash		0
Cash and cash equivalents	$ 20,402	$ 77	$ 17,791

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