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Electric utility segment - Condensed consolidating statement of cash flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Cash flows from operating activities
Net cash provided by operating activities	$ 212,987	$ 267,205
Cash flows from investing activities
Capital expenditures	(236,278)	(219,252)
Other	15,646	10,078
Net cash used in investing activities	(794,762)	(984,839)
Cash flows from financing activities
Common stock dividends	(114,917)	(111,477)
Repayment of short-term debt	0	(65,000)
Proceeds from issuance of long-term debt	67,312	206,988
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	320,735	39,635
Other	(6,112)	(7,462)
Net cash provided by financing activities	449,491	595,990
Net decrease in cash, cash equivalents and restricted cash	(132,284)	(121,644)
Cash, cash equivalents and restricted cash, beginning of period	311,462	358,979
Cash, cash equivalents and restricted cash, end of period	179,178	237,335
Less: Restricted cash	(3,898)	(9,412)	$ (5,911)
Cash and cash equivalents	175,280	227,923	305,551
Hawaiian Electric Consolidated
Cash flows from operating activities
Net cash provided by operating activities	124,167	198,256
Cash flows from investing activities
Capital expenditures	(225,876)	(203,746)
Advances to affiliates	0	0
Other	6,750	6,157
Net cash used in investing activities	(219,126)	(197,589)
Cash flows from financing activities
Common stock dividends	(94,425)	(83,775)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,496)	(1,496)
Repayment of short-term debt	0	(50,000)
Proceeds from issuance of long-term debt	60,000	115,000
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	97,450	0
Payments of obligations under finance leases	(266)	0
Other	(258)	(942)
Net cash provided by financing activities	61,005	(21,213)
Net decrease in cash, cash equivalents and restricted cash	(33,954)	(20,546)
Cash, cash equivalents and restricted cash, beginning of period	55,258	63,326
Cash, cash equivalents and restricted cash, end of period	21,304	42,780
Less: Restricted cash	0	(6,313)	(3,089)
Cash and cash equivalents	21,304	36,467	52,169
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric
Cash flows from operating activities
Net cash provided by operating activities	74,053	157,191
Cash flows from investing activities
Capital expenditures	(152,015)	(137,916)
Advances to affiliates	1,000	26,000
Other	4,545	4,136
Net cash used in investing activities	(146,470)	(107,780)
Cash flows from financing activities
Common stock dividends	(94,425)	(83,775)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(810)	(810)
Repayment of short-term debt		(50,000)
Proceeds from issuance of long-term debt	40,000	60,000
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	114,950	0
Payments of obligations under finance leases	(266)
Other	(170)	(703)
Net cash provided by financing activities	59,279	(75,288)
Net decrease in cash, cash equivalents and restricted cash	(13,138)	(25,877)
Cash, cash equivalents and restricted cash, beginning of period	26,433	58,171
Cash, cash equivalents and restricted cash, end of period	13,295	32,294
Less: Restricted cash		(6,313)	(3,089)
Cash and cash equivalents	13,295	25,981	23,344
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light
Cash flows from operating activities
Net cash provided by operating activities	38,302	32,698
Cash flows from investing activities
Capital expenditures	(34,055)	(33,511)
Advances to affiliates	(1,500)	0
Other	825	1,121
Net cash used in investing activities	(34,730)	(32,390)
Cash flows from financing activities
Common stock dividends	(12,300)	(10,950)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(400)	(400)
Repayment of short-term debt		0
Proceeds from issuance of long-term debt	10,000	30,000
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(1,000)	(18,100)
Payments of obligations under finance leases	0
Other	(44)	(116)
Net cash provided by financing activities	(3,744)	434
Net decrease in cash, cash equivalents and restricted cash	(172)	742
Cash, cash equivalents and restricted cash, beginning of period	5,326	3,046
Cash, cash equivalents and restricted cash, end of period	5,154	3,788
Less: Restricted cash		0	0
Cash and cash equivalents	5,154	3,788	5,326
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric
Cash flows from operating activities
Net cash provided by operating activities	35,512	30,643
Cash flows from investing activities
Capital expenditures	(39,806)	(32,319)
Advances to affiliates	(16,000)	0
Other	1,380	900
Net cash used in investing activities	(54,426)	(31,419)
Cash flows from financing activities
Common stock dividends	(11,400)	(11,326)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(286)	(286)
Repayment of short-term debt		0
Proceeds from issuance of long-term debt	10,000	25,000
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0	(7,900)
Payments of obligations under finance leases	0
Other	(44)	(123)
Net cash provided by financing activities	(1,730)	5,365
Net decrease in cash, cash equivalents and restricted cash	(20,644)	4,589
Cash, cash equivalents and restricted cash, beginning of period	23,422	2,032
Cash, cash equivalents and restricted cash, end of period	2,778	6,621
Less: Restricted cash		0	0
Cash and cash equivalents	2,778	6,621	23,422
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries
Cash flows from operating activities
Net cash provided by operating activities	0	0
Cash flows from investing activities
Capital expenditures	0	0
Advances to affiliates	0	0
Other	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities
Common stock dividends	0	0
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Repayment of short-term debt		0
Proceeds from issuance of long-term debt	0	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0	0
Payments of obligations under finance leases	0
Other	0	0
Net cash provided by financing activities	0	0
Net decrease 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	77
Less: Restricted cash		0	0
Cash and cash equivalents	77	77	77
Hawaiian Electric Consolidated | Consolidating adjustments
Cash flows from operating activities
Net cash provided by operating activities	(23,700)	(22,276)
Cash flows from investing activities
Capital expenditures	0	0
Advances to affiliates	16,500	(26,000)
Other	0	0
Net cash used in investing activities	16,500	(26,000)
Cash flows from financing activities
Common stock dividends	23,700	22,276
Preferred stock dividends of Hawaiian Electric and subsidiaries	0	0
Repayment of short-term debt		0
Proceeds from issuance of long-term debt	0	0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(16,500)	26,000
Payments of obligations under finance leases	0
Other	0	0
Net cash provided by financing activities	7,200	48,276
Net decrease 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	0
Less: Restricted cash		0	0
Cash and cash equivalents	$ 0	$ 0	$ 0

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