Consolidated Statements of Cash Flows - HECO - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation of property, plant and equipment	$ 261,701	$ 254,990	$ 244,477
Other amortization	31,832	27,316	25,928
Deferred income tax expense (benefit)	(486,188)	9,352	(33,157)
Allowance for equity funds used during construction	(13,786)	(15,164)	(10,574)
Other	(13,790)	(2,989)	(5,323)
Changes in assets and liabilities
Decrease (increase) in fuel oil stock	49,361	43,388	(87,569)
Decrease (increase) in regulatory assets	(22,743)	(10,613)	34,600
Increase in regulatory liabilities	48,433	54,470	44,888
Change in prepaid and accrued income taxes, tax credits and revenue taxes	(25,525)	(9,858)	120,738
Change in defined benefit pension and other postretirement benefit plans asset/liability	(9,358)	(8,215)	(4,564)
Increase in wildfire tort-related claims	1,840,000	75,000	0
Change in other assets and liabilities	(53,812)	(57,255)	(25,924)
Net cash provided by operating activities	487,481	551,471	454,476
Cash flows from investing activities
Capital expenditures	(344,251)	(442,727)	(339,333)
Other, net	10,330	6,558	14,184
Net cash used in investing activities	258,318	(257,399)	(1,128,682)
Cash flows from financing activities
Common stock dividends	0	(73,957)	(111,229)
Proceeds from issuance of common stock/capital contribution from parent	556,612	1,223	0
Proceeds from issuance of long-term debt	5,475	625,000	227,312
Repayment of long-term debt and funds transferred for repayment of long-term debt	(97,698)	(167,080)	(221,910)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0	(137,650)	83,652
Proceeds from issuance of short-term debt	50,000	65,000	35,000
Payments of obligations under finance leases	(4,678)	(3,519)
Other	(13,867)	(5,133)	(2,041)
Net cash provided by (used in) financing activities	154,705	195,575	567,671
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations	900,504	489,647	(106,535)
Cash, cash equivalents and restricted cash, including cash from discontinued operations, January 1	694,574	204,927	311,462
Cash, cash equivalents and restricted cash, including cash from discontinued operations, December 31	1,595,078	694,574	204,927
Less: Restricted cash	(492,317)	(15,028)	(5,050)
Cash and cash equivalents	750,535	244,091	43,728
Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income (loss)	(1,224,367)	195,947	190,924
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation of property, plant and equipment	251,142	243,705	235,424
Other amortization	31,828	26,490	25,320
Deferred income tax expense (benefit)	(481,624)	1,439	(41,415)
State refundable credit	(11,914)	(11,325)	(10,999)
Bad debt expense	4,720	8,161	6,027
Allowance for equity funds used during construction	(13,786)	(15,164)	(10,574)
Other	(6,311)	460	(139)
Changes in assets and liabilities
Decrease (increase) in accounts receivable	88,376	(65,004)	(91,742)
Decrease (increase) in accrued unbilled revenues	7,561	(3,048)	(54,023)
Decrease (increase) in fuel oil stock	49,334	43,293	(87,452)
Increase in materials and supplies	(4,033)	(34,865)	(7,691)
Decrease (increase) in regulatory assets	(22,743)	(10,613)	34,600
Increase in regulatory liabilities	48,433	54,470	44,888
Increase in accounts payable	9,644	20,454	22,355
Change in prepaid and accrued income taxes, tax credits and revenue taxes	(26,542)	1,878	103,198
Change in defined benefit pension and other postretirement benefit plans asset/liability	(9,218)	(8,186)	(4,828)
Increase in wildfire tort-related claims	1,840,000	75,000	0
Change in other assets and liabilities	(64,767)	(48,725)	(25,943)
Net cash provided by operating activities	465,733	474,367	327,930
Cash flows from investing activities
Capital expenditures	(329,479)	(438,775)	(329,457)
Other, net	11,848	6,176	5,372
Net cash used in investing activities	(317,631)	(432,599)	(324,085)
Cash flows from financing activities
Common stock dividends	(26,000)	(129,000)	(125,900)
Preferred stock dividends of Hawaiian Electric and subsidiaries	(1,995)	(1,995)	(1,995)
Proceeds from issuance of common stock/capital contribution from parent	270	0	13,101
Proceeds from issuance of long-term debt	0	350,000	60,000
Repayment of long-term debt and funds transferred for repayment of long-term debt	(81,000)	(100,000)	(52,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less	0	(87,967)	87,967
Proceeds from issuance of short-term debt	50,000	0	0
Payments of obligations under finance leases	(4,119)	(3,128)	(670)
Other	(9,187)	(843)	(364)
Net cash provided by (used in) financing activities	(72,031)	27,067	(19,861)
Net increase (decrease) in cash, cash equivalents and restricted cash, including cash from discontinued operations	76,071	68,835	(16,016)
Cash, cash equivalents and restricted cash, including cash from discontinued operations, January 1	108,077	39,242	55,258
Cash, cash equivalents and restricted cash, including cash from discontinued operations, December 31	184,148	108,077	39,242
Less: Restricted cash	0	(2,000)	0
Cash and cash equivalents	$ 184,148	$ 106,077	$ 39,242