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Electric utility segment - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |
Net income (loss) | $ 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 |  |  |
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)
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 | 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 | (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
Net increase (decrease) in other bank borrowings with original maturities of three months or less | (1,365) | (25,440) | 5,070
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 (parent only) |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 246,166 | 197,824 | 217,882
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation of property, plant and equipment | 414 | 485 | 570
Changes in assets and liabilities |  |  |
Net cash provided by operating activities | 154,151 | 134,363 | 131,120
Cash flows from investing activities |  |  |
Capital expenditures | (10) | (20) | (47)
Other | 180 | 2,435 | (1,001)
Net cash used in investing activities | (76,062) | (17,530) | (41,170)
Cash flows from financing activities |  |  |
Common stock dividends | (148,643) | (144,096) | (139,463)
Proceeds from issuance of long-term debt | 150,000 | 50,000 | 0
Repayment of long-term debt | (50,000) | 0 | 0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (10,493) | (32,232) | 47,731
Proceeds from issuance of short-term debt | 0 | 65,000 | 0
Repayment of short-term debt | (15,000) | (50,000) | 0
Other | (1,767) | (459) | (10)
Net cash used in financing activities | (77,909) | (117,487) | (92,739)
Net increase (decrease) in cash and equivalents | 180 | (654) | (2,789)
Cash, cash equivalents and restricted cash, January 1 | 299 | 953 | 3,742
Cash, cash equivalents and restricted cash, December 31 | 479 | 299 | 953
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 179,637 | 171,335 | 158,835
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 0 | 0 | (37)
Common stock dividends received from subsidiaries | 0 | 0 | 35
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
Increase in fuel oil stock | (45,840) | 33,699 | (12,002)
Decrease (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 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)
Changes in other assets and liabilities | (52,302) | (31,852) | (17,624)
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)
Advances from (to) affiliates | 0 | 0 | 0
Other | 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 | 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
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | (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
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaiian Electric (parent only) |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 178,722 | 170,420 | 157,920
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | (45,353) | (47,504) | (43,204)
Common stock dividends received from subsidiaries | 29,700 | 30,704 | 32,783
Depreciation of property, plant and equipment | 155,607 | 151,387 | 143,470
Other amortization | 16,688 | 24,511 | 23,351
Deferred income taxes | (3,191) | 2,130 | (13,547)
State refundable credit | (7,120) | (6,668) | (6,245)
Bad debt expense | 1,159 | 1,042 | 1,236
Allowance for equity funds used during construction | (7,734) | (7,335) | (9,955)
Bill credits | 1,400 |  |
Accrued environmental reserve |  | 6,556 | 406
Other | 366 | 1,201 | 27,575
Changes in assets and liabilities |  |  |
Decrease (increase) in accounts receivable | (41,727) | (8,093) | 24,150
Decrease (increase) in accrued unbilled revenues | (18,345) | 8,832 | 4,902
Increase in fuel oil stock | (32,407) | 30,226 | (14,741)
Decrease (increase) in materials and supplies | (3,220) | (3,910) | (4,585)
Decrease (increase) in regulatory assets | (15,422) | 8,526 | 55,494
Increase (decrease) in regulatory liabilities | 16,269 | (5,490) | 102
Increase in accounts payable | 9,828 | (26,093) | 4,687
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 21,217 | (25,757) | (24,900)
Decrease in defined benefit pension and other postretirement benefit plans liability | (3,480) | (3,092) | (3,033)
Changes in other assets and liabilities | (36,733) | (21,124) | (15,747)
Net cash provided by operating activities | 216,224 | 280,469 | 340,119
Cash flows from investing activities |  |  |
Capital expenditures | (194,984) | (229,127) | (311,538)
Advances from (to) affiliates | 25,700 | 1,000 | (27,700)
Other | (29,596) | (14,340) | 5,241
Net cash used in investing activities | (198,880) | (242,467) | (333,997)
Cash flows from financing activities |  |  |
Common stock dividends | (111,700) | (107,134) | (101,252)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (1,080) | (1,080) | (1,080)
Proceeds from issuance of common stock | 54,400 | 34,000 | 35,500
Proceeds from issuance of long-term debt | 60,000 | 205,000 | 190,000
Repayment of long-term debt |  | (95,000) | (183,546)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 0 |  | 46,987
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | (46,987) |
Proceeds from issuance of short-term debt |  | 100,000 | 75,000
Repayment of short-term debt | (50,000) | (100,000) | (50,000)
Other | (702) | (1,618) | (1,475)
Net cash used in financing activities | (49,082) | (12,819) | 10,134
Net increase (decrease) in cash and equivalents | (31,738) | 25,183 | 16,256
Cash, cash equivalents and restricted cash, January 1 | 58,171 | 32,988 | 16,732
Cash, cash equivalents and restricted cash, December 31 | 26,433 | 58,171 | 32,988
Less: Restricted cash | (3,089) | (15,966) | (30,749)
Cash and cash equivalents | 23,344 | 42,205 | 2,239
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaii Electric Light |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 21,714 | 28,027 | 21,351
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 0 | 0 | 0
Common stock dividends received from subsidiaries | 0 | 0 | 0
Depreciation of property, plant and equipment | 40,201 | 39,041 | 41,812
Other amortization | 3,532 | 5,090 | 4,810
Deferred income taxes | (1,955) | (463) | (2,383)
State refundable credit | (1,672) | (1,593) | (559)
Bad debt expense | 509 | 620 | 470
Allowance for equity funds used during construction | (586) | (543) | (816)
Bill credits | 300 |  |
Accrued environmental reserve |  | 0 | 0
Other | (41) | 1,322 | (61)
Changes in assets and liabilities |  |  |
Decrease (increase) in accounts receivable | (6,832) | (3,349) | 2,858
Decrease (increase) in accrued unbilled revenues | (5,816) | 3,327 | (22)
Increase in fuel oil stock | (4,343) | 430 | 2,126
Decrease (increase) in materials and supplies | 169 | (1,583) | (1,158)
Decrease (increase) in regulatory assets | 24 | (2,908) | 9,218
Increase (decrease) in regulatory liabilities | (1,031) | (4,489) | (1,558)
Increase in accounts payable | 4,723 | (1,819) | (3,160)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 3,861 | (5,483) | (893)
Decrease in defined benefit pension and other postretirement benefit plans liability | (950) | (643) | (762)
Changes in other assets and liabilities | (5,833) | (8,864) | (6,152)
Net cash provided by operating activities | 45,974 | 46,120 | 65,121
Cash flows from investing activities |  |  |
Capital expenditures | (50,516) | (64,346) | (49,811)
Advances from (to) affiliates | 0 | 8,000 | (8,000)
Other | 1,072 | 1,032 | 297
Net cash used in investing activities | (49,444) | (55,314) | (57,514)
Cash flows from financing activities |  |  |
Common stock dividends | (14,600) | (16,320) | (17,680)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (534) | (534) | (534)
Proceeds from issuance of common stock | 8,803 | 7,500 | 0
Proceeds from issuance of long-term debt | 30,000 | 10,000 | 72,500
Repayment of long-term debt |  | (14,000) | (70,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (17,800) |  | 0
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 18,800 |
Proceeds from issuance of short-term debt |  | 0 | 0
Repayment of short-term debt | 0 | 0 | 0
Other | (119) | (214) | (508)
Net cash used in financing activities | 5,750 | 5,232 | (16,222)
Net increase (decrease) in cash and equivalents | 2,280 | (3,962) | (8,615)
Cash, cash equivalents and restricted cash, January 1 | 3,046 | 7,008 | 15,623
Cash, cash equivalents and restricted cash, December 31 | 5,326 | 3,046 | 7,008
Less: Restricted cash | 0 | 0 | (123)
Cash and cash equivalents | 5,326 | 3,046 | 6,885
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Maui Electric |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 24,554 | 20,392 | 22,731
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 0 | 0 | 0
Common stock dividends received from subsidiaries | 0 | 0 | 0
Depreciation of property, plant and equipment | 33,661 | 32,305 | 30,449
Other amortization | 1,517 | 4,145 | 1,470
Deferred income taxes | 1,317 | 1,484 | (354)
State refundable credit | (1,790) | (1,700) | (1,565)
Bad debt expense | 515 | 453 | 444
Allowance for equity funds used during construction | (1,214) | (890) | (1,216)
Bill credits | 300 |  |
Accrued environmental reserve |  | 0 | 0
Other | 1,025 | 87 | (55)
Changes in assets and liabilities |  |  |
Decrease (increase) in accounts receivable | (3,071) | (1,343) | 3,029
Decrease (increase) in accrued unbilled revenues | (3,303) | 3,126 | (385)
Increase in fuel oil stock | (9,090) | 3,043 | 613
Decrease (increase) in materials and supplies | (1,482) | (1,149) | 245
Decrease (increase) in regulatory assets | 1,524 | (4,611) | 6,550
Increase (decrease) in regulatory liabilities | 120 | (6,583) | 3,409
Increase in accounts payable | 3,120 | (5,217) | (3,578)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 1,938 | (5,998) | (3,097)
Decrease in defined benefit pension and other postretirement benefit plans liability | (724) | (571) | (653)
Changes in other assets and liabilities | (8,196) | 3,635 | (6,940)
Net cash provided by operating activities | 40,721 | 40,608 | 51,097
Cash flows from investing activities |  |  |
Capital expenditures | (46,500) | (57,391) | (58,549)
Advances from (to) affiliates | 0 | 0 | 0
Other | 1,073 | 960 | 1,303
Net cash used in investing activities | (45,427) | (56,431) | (57,246)
Cash flows from financing activities |  |  |
Common stock dividends | (15,100) | (14,384) | (15,068)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (381) | (381) | (381)
Proceeds from issuance of common stock | 24,597 | 11,000 | 4,900
Proceeds from issuance of long-term debt | 25,000 | 40,000 | 17,500
Repayment of long-term debt |  | 0 | (30,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (7,900) |  | 27,700
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | (19,800) |
Proceeds from issuance of short-term debt |  | 0 | 0
Repayment of short-term debt | 0 | 0 | 0
Other | (120) | (377) | (126)
Net cash used in financing activities | 26,096 | 16,058 | 4,525
Net increase (decrease) in cash and equivalents | 21,390 | 235 | (1,624)
Cash, cash equivalents and restricted cash, January 1 | 2,032 | 1,797 | 3,421
Cash, cash equivalents and restricted cash, December 31 | 23,422 | 2,032 | 1,797
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | 23,422 | 2,032 | 1,797
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Other subsidiaries |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 0 | 0 | 0
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 0 | 0 | 0
Common stock dividends received from subsidiaries | 0 | 0 | 0
Depreciation of property, plant and equipment | 0 | 0 | 0
Other amortization | 0 | 0 | 0
Deferred income taxes | 0 | 0 | 0
State refundable credit | 0 | 0 | 0
Bad debt expense | 0 | 0 | 0
Allowance for equity funds used during construction | 0 | 0 | 0
Bill credits | 0 |  |
Accrued environmental reserve |  | 0 | 0
Other | 0 | 0 | 0
Changes in assets and liabilities |  |  |
Decrease (increase) in accounts receivable | 0 | 0 | 0
Decrease (increase) in accrued unbilled revenues | 0 | 0 | 0
Increase in fuel oil stock | 0 | 0 | 0
Decrease (increase) in materials and supplies | 0 | 0 | 0
Decrease (increase) in regulatory assets | 0 | 0 | 0
Increase (decrease) in regulatory liabilities |  |  |
Increase in accounts payable | 0 | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 0 | 0 | 0
Decrease in defined benefit pension and other postretirement benefit plans liability | 0 | 0 | 0
Changes in other assets and liabilities | 0 | 0 | 0
Net cash provided by operating activities | 0 | 0 | 0
Cash flows from investing activities |  |  |
Capital expenditures | 0 | 0 | 0
Advances from (to) affiliates | 0 | 0 | 0
Other |  | (24) | 0
Net cash used in investing activities | 0 | (24) | 0
Cash flows from financing activities |  |  |
Common stock dividends | 0 | 0 | 0
Preferred stock dividends of Hawaiian Electric and subsidiaries | 0 | 0 | 0
Proceeds from issuance of common stock | 0 | 0 | 0
Proceeds from issuance of long-term debt | 0 | 0 | 0
Repayment 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
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 0 |
Proceeds from issuance of short-term debt |  | 0 | 0
Repayment of short-term debt | 0 | 0 | 0
Other | 0 | 0 | 0
Net cash used in financing activities | 0 | 0 | 0
Net increase (decrease) in cash and equivalents | 0 | (24) | 0
Cash, cash equivalents and restricted cash, January 1 | 77 | 101 | 101
Cash, cash equivalents and restricted cash, December 31 | 77 | 77 | 101
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | 77 | 77 | 101
Hawaiian Electric Company, Inc. and Subsidiaries | Consolidating adjustments |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | (45,353) | (47,504) | (43,167)
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 45,353 | 47,504 | 43,167
Common stock dividends received from subsidiaries | (29,700) | (30,704) | (32,748)
Depreciation of property, plant and equipment | 0 | 0 | 0
Other amortization | 0 | 0 | 0
Deferred income taxes | 0 | 0 | 0
State refundable credit | 0 | 0 | 0
Bad debt expense | 0 | 0 | 0
Allowance for equity funds used during construction | 0 | 0 | 0
Bill credits | 0 |  |
Accrued environmental reserve |  | 0 | 0
Other | 0 | 0 | 0
Changes in assets and liabilities |  |  |
Decrease (increase) in accounts receivable | 1,540 | 5,499 | (11,215)
Decrease (increase) in accrued unbilled revenues | 0 | 0 | 0
Increase in fuel oil stock | 0 | 0 | 0
Decrease (increase) in materials and supplies | 0 | 0 | 0
Decrease (increase) in regulatory assets | 0 | 0 | 0
Increase (decrease) in regulatory liabilities |  |  |
Increase in accounts payable | 0 | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (86) | 58 | 367
Decrease in defined benefit pension and other postretirement benefit plans liability | 0 | 0 | 0
Changes in other assets and liabilities | (1,540) | (5,499) | 11,215
Net cash provided by operating activities | (29,786) | (30,646) | (32,381)
Cash flows from investing activities |  |  |
Capital expenditures | 0 | 0 | 0
Advances from (to) affiliates | (25,700) | (9,000) | 35,700
Other | 33,486 | 18,442 | 4,533
Net cash used in investing activities | 7,786 | 9,442 | 40,233
Cash flows from financing activities |  |  |
Common stock dividends | 29,700 | 30,704 | 32,748
Preferred stock dividends of Hawaiian Electric and subsidiaries | 0 | 0 | 0
Proceeds from issuance of common stock | (33,400) | (18,500) | (4,900)
Proceeds from issuance of long-term debt | 0 | 0 | 0
Repayment 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 | 25,700 |  | (35,700)
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 9,000 |
Proceeds from issuance of short-term debt |  | 0 | 0
Repayment of short-term debt | 0 | 0 | 0
Other | 0 | 0 | 0
Net cash used in financing activities | 22,000 | 21,204 | (7,852)
Net increase (decrease) in cash and equivalents | 0 | 0 | 0
Cash, cash equivalents and restricted cash, January 1 | 0 | 0 | 0
Cash, cash equivalents and restricted cash, December 31 | 0 | 0 | 0
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | $ 0 | $ 0 | $ 0

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