Consolidated Statements of Cash Flows - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 248,056	$ 199,714	$ 219,772
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	246,158	238,114	229,858
Other amortization	32,544	52,664	48,255
Deferred income taxes	(5,398)	(1,706)	(15,085)
Allowance for equity funds used during construction	(9,534)	(8,768)	(11,987)
Other	(7,060)	1,366	18,568
Changes in assets and liabilities
Decrease (increase) in fuel oil stock	(45,819)	34,202	(11,493)
Decrease (increase) in regulatory assets	(13,874)	1,007	71,262
Increase (decrease) in regulatory liabilities	15,358	(16,562)	1,953
Change in prepaid and accrued income taxes, tax credits and revenue taxes	41,331	(35,610)	(27,538)
Decrease in defined benefit pension and other postretirement benefit plans liability	(6,660)	(2,029)	(4,482)
Change in other assets and liabilities	(52,882)	(42,189)	(36,677)
Net cash provided by operating activities	375,673	429,407	512,470
Cash flows from investing activities
Capital expenditures	(314,524)	(383,895)	(457,520)
Other, net	27	3,412	13,291
Net cash used in investing activities	(1,179,592)	(1,413,648)	(541,709)
Cash flows from financing activities
Common stock dividends	(148,643)	(144,096)	(139,463)
Proceeds from issuance of long-term debt	285,886	415,997	289,349
Repayment of long-term debt and funds transferred for repayment of long-term debt	(82,262)	(178,969)	(287,285)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	(10,493)	(71,219)	86,718
Proceeds from issuance of short-term debt	0	165,000	75,000
Repayment of short-term debt	(65,000)	(150,000)	(50,000)
Other	(3,080)	(3,203)	(1,836)
Net cash used in financing activities	756,402	1,115,535	87,716
Net increase (decrease) in cash and equivalents	(47,517)	131,294	58,477
Cash, cash equivalents and restricted cash, January 1	358,979	227,685	169,208
Cash, cash equivalents and restricted cash, December 31	311,462	358,979	227,685
Less: Restricted cash	(5,911)	(17,558)	(30,872)
Cash and cash equivalents	305,551	341,421	196,813
Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income	179,637	171,335	158,835
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	229,469	222,733	215,731
Other amortization	21,737	33,746	29,631
Deferred income taxes	(3,829)	3,151	(16,284)
State refundable credit	(10,582)	(9,961)	(8,369)
Bad debt expense	2,183	2,115	2,150
Allowance for equity funds used during construction	(9,534)	(8,768)	(11,987)
Bill credits	2,000	0	0
Accrued environmental reserve	0	6,556	406
Other	1,350	2,610	27,459
Changes in assets and liabilities
Decrease (increase) in accounts receivable	(50,090)	(7,286)	18,822
Decrease (increase) in accrued unbilled revenues	(27,464)	15,285	4,495
Decrease (increase) in fuel oil stock	(45,840)	33,699	(12,002)
Increase in materials and supplies	(4,533)	(6,642)	(5,498)
Decrease (increase) in regulatory assets	(13,874)	1,007	71,262
Increase (decrease) in regulatory liabilities	15,358	(16,562)	1,953
Increase (decrease) in accounts payable	17,671	(33,129)	(2,051)
Change in prepaid and accrued income taxes, tax credits and revenue taxes	26,930	(37,180)	(28,523)
Decrease in defined benefit pension and other postretirement benefit plans liability	(5,154)	(4,306)	(4,448)
Change in other assets and liabilities	(52,302)	(31,852)	(17,626)
Net cash provided by operating activities	273,133	336,551	423,956
Cash flows from investing activities
Capital expenditures	(292,000)	(350,864)	(419,898)
Other, net	6,035	6,070	11,374
Net cash used in investing activities	(285,965)	(344,794)	(408,524)
Cash flows from financing activities
Common stock dividends	(111,700)	(107,134)	(101,252)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,995)	(1,995)	(1,995)
Proceeds from issuance of common stock	54,400	34,000	35,500
Proceeds from issuance of long-term debt	115,000	255,000	280,000
Repayment of long-term debt and funds transferred for repayment of long-term debt	0	(109,000)	(283,546)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0	(38,987)	38,987
Proceeds from issuance of short-term debt	0	100,000	75,000
Repayment of short-term debt	(50,000)	(100,000)	(50,000)
Other	(941)	(2,209)	(2,109)
Net cash used in financing activities	4,764	29,675	(9,415)
Net increase (decrease) in cash and equivalents	(8,068)	21,432	6,017
Cash, cash equivalents and restricted cash, January 1	63,326	41,894	35,877
Cash, cash equivalents and restricted cash, December 31	55,258	63,326	41,894
Less: Restricted cash	(3,089)	(15,966)	(30,872)
Cash and cash equivalents	$ 52,169	$ 47,360	$ 11,022