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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation of property, plant and equipment | $ 256,069 | $ 246,158 | $ 238,114
Other amortization | 38,772 | 32,544 | 52,664
Deferred income taxes | (32,502) | (5,398) | (1,706)
Allowance for equity funds used during construction | (10,574) | (9,534) | (8,768)
Other | (7,580) | (7,060) | 1,366
Changes in assets and liabilities |  |  |
Increase in fuel oil stock | (87,569) | (45,819) | 34,202
Decrease in regulatory assets | 34,600 | (13,874) | 1,007
Increase in regulatory liabilities | 44,888 | 15,358 | (16,562)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 121,636 | 41,331 | (35,610)
Decrease in defined benefit pension and other postretirement benefit plans liability | (5,191) | (6,660) | (2,029)
Net cash provided by operating activities | 454,476 | 375,673 | 429,407
Cash flows from investing activities |  |  |
Capital expenditures | (344,037) | (314,524) | (383,895)
Other | 13,046 | 27 | 3,412
Net cash used in investing activities | (1,128,682) | (1,179,592) | (1,413,648)
Cash flows from financing activities |  |  |
Common stock dividends | (153,229) | (148,643) | (144,096)
Proceeds from issuance of long-term debt | 227,312 | 285,886 | 415,997
Repayment of long-term debt | (221,910) | (82,262) | (178,969)
Net increase (decrease) in other bank borrowings with original maturities of three months or less | 606,815 | (1,365) | (25,440)
Proceeds from issuance of short-term debt | 35,000 | 0 | 165,000
Repayment of short-term debt | 0 | (65,000) | (150,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 83,652 | (10,493) | (71,219)
Payments of obligations under finance leases | (849) |  |
Other | (2,398) | (3,080) | (3,203)
Net cash used in financing activities | 567,671 | 756,402 | 1,115,535
Net increase (decrease) in cash and equivalents | (106,535) | (47,517) | 131,294
Cash, cash equivalents and restricted cash, January 1 | 311,462 | 358,979 | 227,685
Cash, cash equivalents and restricted cash, December 31 | 204,927 | 311,462 | 358,979
Less: Restricted cash | (5,050) | (5,911) | (17,558)
Cash and cash equivalents | 199,877 | 305,551 | 341,421
Hawaiian Electric (parent only) |  |  |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation of property, plant and equipment | 399 | 414 | 485
Changes in assets and liabilities |  |  |
Net cash provided by operating activities | 167,150 | 154,151 | 134,363
Cash flows from investing activities |  |  |
Capital expenditures | (224) | (10) | (20)
Other | 1,662 | 180 | 2,435
Net cash used in investing activities | (50,331) | (76,062) | (17,530)
Cash flows from financing activities |  |  |
Common stock dividends | (153,229) | (148,643) | (144,096)
Proceeds from issuance of long-term debt | 160,000 | 150,000 | 50,000
Repayment of long-term debt | (150,000) | (50,000) | 0
Proceeds from issuance of short-term debt | 35,000 | 0 | 65,000
Repayment of short-term debt | 0 | (15,000) | (50,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (4,315) | (10,493) | (32,232)
Other | (978) | (1,767) | (459)
Net cash used in financing activities | (116,687) | (77,909) | (117,487)
Net increase (decrease) in cash and equivalents | 132 | 180 | (654)
Cash, cash equivalents and restricted cash, January 1 | 479 | 299 | 953
Cash, cash equivalents and restricted cash, December 31 | 611 | 479 | 299
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 190,924 | 179,637 | 171,335
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 | 235,424 | 229,469 | 222,733
Other amortization | 25,320 | 21,737 | 33,746
Deferred income taxes | (41,415) | (3,829) | 3,151
State refundable credit | (10,999) | (10,582) | (9,961)
Bad debt expense | 6,027 | 2,183 | 2,115
Allowance for equity funds used during construction | (10,574) | (9,534) | (8,768)
Accrued environmental reserve | 0 | 0 | 6,556
Bill credits | 0 | 2,000 | 0
Other | (139) | 1,350 | 2,610
Changes in assets and liabilities |  |  |
Increase in accounts receivable | (91,742) | (50,090) | (7,286)
Decrease (increase) in accrued unbilled revenues | (54,023) | (27,464) | 15,285
Increase in fuel oil stock | (87,452) | (45,840) | 33,699
Increase in materials and supplies | (7,691) | (4,533) | (6,642)
Decrease in regulatory assets | 34,600 | (13,874) | 1,007
Increase in regulatory liabilities | 44,888 | 15,358 | (16,562)
Increase in accounts payable | 22,355 | 17,671 | (33,129)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 103,198 | 26,930 | (37,180)
Decrease in defined benefit pension and other postretirement benefit plans liability | (4,828) | (5,154) | (4,306)
Change in other assets and liabilities | (25,943) | (52,302) | (31,852)
Net cash provided by operating activities | 327,930 | 273,133 | 336,551
Cash flows from investing activities |  |  |
Capital expenditures | (329,457) | (292,000) | (350,864)
Advances to affiliates | 0 | 0 | 0
Other | 5,372 | 6,035 | 6,070
Net cash used in investing activities | (324,085) | (285,965) | (344,794)
Cash flows from financing activities |  |  |
Common stock dividends | (125,900) | (111,700) | (107,134)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (1,995) | (1,995) | (1,995)
Proceeds from issuance of common stock | 13,101 | 54,400 | 34,000
Proceeds from issuance of long-term debt | 60,000 | 115,000 | 255,000
Repayment of long-term debt | (52,000) | 0 | (109,000)
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 0 | (38,987)
Proceeds from issuance of short-term debt | 0 | 0 | 100,000
Repayment of short-term debt | 0 | (50,000) | (100,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 87,967 | 0 | (38,987)
Payments of obligations under finance leases | (670) | 0 | 0
Other | (364) | (941) | (2,209)
Net cash used in financing activities | (19,861) | 4,764 | 29,675
Net increase (decrease) in cash and equivalents | (16,016) | (8,068) | 21,432
Cash, cash equivalents and restricted cash, January 1 | 55,258 | 63,326 | 41,894
Cash, cash equivalents and restricted cash, December 31 | 39,242 | 55,258 | 63,326
Less: Restricted cash | 0 | (3,089) | (15,966)
Cash and cash equivalents | 39,242 | 52,169 | 47,360
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaiian Electric (parent only) |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 190,009 | 178,722 | 170,420
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | (47,493) | (45,353) | (47,504)
Common stock dividends received from subsidiaries | 31,600 | 29,700 | 30,704
Depreciation of property, plant and equipment | 158,725 | 155,607 | 151,387
Other amortization | 16,708 | 16,688 | 24,511
Deferred income taxes | (33,648) | (3,191) | 2,130
State refundable credit | (7,375) | (7,120) | (6,668)
Bad debt expense | 4,175 | 1,159 | 1,042
Allowance for equity funds used during construction | (8,464) | (7,734) | (7,335)
Accrued environmental reserve |  |  | 6,556
Bill credits |  | 1,400 |
Other | (65) | 366 | 1,201
Changes in assets and liabilities |  |  |
Increase in accounts receivable | (74,067) | (41,727) | (8,093)
Decrease (increase) in accrued unbilled revenues | (43,972) | (18,345) | 8,832
Increase in fuel oil stock | (82,158) | (32,407) | 30,226
Increase in materials and supplies | (6,124) | (3,220) | (3,910)
Decrease in regulatory assets | 28,076 | (15,422) | 8,526
Increase in regulatory liabilities | 28,621 | 16,269 | (5,490)
Increase in accounts payable | 18,657 | 9,828 | (26,093)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 77,903 | 21,217 | (25,757)
Decrease in defined benefit pension and other postretirement benefit plans liability | (3,545) | (3,480) | (3,092)
Change in other assets and liabilities | (17,884) | (36,733) | (21,124)
Net cash provided by operating activities | 229,679 | 216,224 | 280,469
Cash flows from investing activities |  |  |
Capital expenditures | (223,223) | (194,984) | (229,127)
Advances to affiliates | 1,000 | 25,700 | 1,000
Other | (5,687) | (29,596) | (14,340)
Net cash used in investing activities | (227,910) | (198,880) | (242,467)
Cash flows from financing activities |  |  |
Common stock dividends | (125,900) | (111,700) | (107,134)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (1,080) | (1,080) | (1,080)
Proceeds from issuance of common stock | 13,101 | 54,400 | 34,000
Proceeds from issuance of long-term debt | 40,000 | 60,000 | 205,000
Repayment of long-term debt | (40,000) |  | (95,000)
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 0 | (46,987)
Proceeds from issuance of short-term debt |  |  | 100,000
Repayment of short-term debt |  | (50,000) | (100,000)
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 114,167 |  |
Payments of obligations under finance leases | (670) |  |
Other | (241) | (702) | (1,618)
Net cash used in financing activities | (623) | (49,082) | (12,819)
Net increase (decrease) in cash and equivalents | 1,146 | (31,738) | 25,183
Cash, cash equivalents and restricted cash, January 1 | 26,433 | 58,171 | 32,988
Cash, cash equivalents and restricted cash, December 31 | 27,579 | 26,433 | 58,171
Less: Restricted cash | 0 | (3,089) | (15,966)
Cash and cash equivalents | 27,579 | 23,344 | 42,205
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaii Electric Light |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 22,350 | 21,714 | 28,027
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 | 41,404 | 40,201 | 39,041
Other amortization | 4,996 | 3,532 | 5,090
Deferred income taxes | (4,040) | (1,955) | (463)
State refundable credit | (1,734) | (1,672) | (1,593)
Bad debt expense | 1,073 | 509 | 620
Allowance for equity funds used during construction | (898) | (586) | (543)
Accrued environmental reserve |  |  | 0
Bill credits |  | 300 |
Other | (50) | (41) | 1,322
Changes in assets and liabilities |  |  |
Increase in accounts receivable | (11,644) | (6,832) | (3,349)
Decrease (increase) in accrued unbilled revenues | (4,289) | (5,816) | 3,327
Increase in fuel oil stock | (4,150) | (4,343) | 430
Increase in materials and supplies | (56) | 169 | (1,583)
Decrease in regulatory assets | 1,546 | 24 | (2,908)
Increase in regulatory liabilities | 7,977 | (1,031) | (4,489)
Increase in accounts payable | 3,294 | 4,723 | (1,819)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 11,117 | 3,861 | (5,483)
Decrease in defined benefit pension and other postretirement benefit plans liability | (626) | (950) | (643)
Change in other assets and liabilities | 213 | (5,833) | (8,864)
Net cash provided by operating activities | 66,483 | 45,974 | 46,120
Cash flows from investing activities |  |  |
Capital expenditures | (49,004) | (50,516) | (64,346)
Advances to affiliates | (4,500) | 0 | 8,000
Other | 760 | 1,072 | 1,032
Net cash used in investing activities | (52,744) | (49,444) | (55,314)
Cash flows from financing activities |  |  |
Common stock dividends | (16,400) | (14,600) | (16,320)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (534) | (534) | (534)
Proceeds from issuance of common stock | 6,023 | 8,803 | 7,500
Proceeds from issuance of long-term debt | 10,000 | 30,000 | 10,000
Repayment of long-term debt | (12,000) |  | (14,000)
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | (17,800) | 18,800
Proceeds from issuance of short-term debt |  |  | 0
Repayment of short-term debt |  | 0 | 0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (1,000) |  |
Payments of obligations under finance leases | 0 |  |
Other | (62) | (119) | (214)
Net cash used in financing activities | (13,973) | 5,750 | 5,232
Net increase (decrease) in cash and equivalents | (234) | 2,280 | (3,962)
Cash, cash equivalents and restricted cash, January 1 | 5,326 | 3,046 | 7,008
Cash, cash equivalents and restricted cash, December 31 | 5,092 | 5,326 | 3,046
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | 5,092 | 5,326 | 3,046
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Maui Electric |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | 26,058 | 24,554 | 20,392
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 | 35,295 | 33,661 | 32,305
Other amortization | 3,616 | 1,517 | 4,145
Deferred income taxes | (3,727) | 1,317 | 1,484
State refundable credit | (1,890) | (1,790) | (1,700)
Bad debt expense | 779 | 515 | 453
Allowance for equity funds used during construction | (1,212) | (1,214) | (890)
Accrued environmental reserve |  |  | 0
Bill credits |  | 300 |
Other | (24) | 1,025 | 87
Changes in assets and liabilities |  |  |
Increase in accounts receivable | (10,680) | (3,071) | (1,343)
Decrease (increase) in accrued unbilled revenues | (5,762) | (3,303) | 3,126
Increase in fuel oil stock | (1,144) | (9,090) | 3,043
Increase in materials and supplies | (1,511) | (1,482) | (1,149)
Decrease in regulatory assets | 4,978 | 1,524 | (4,611)
Increase in regulatory liabilities | 8,290 | 120 | (6,583)
Increase in accounts payable | 404 | 3,120 | (5,217)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 14,178 | 1,938 | (5,998)
Decrease in defined benefit pension and other postretirement benefit plans liability | (657) | (724) | (571)
Change in other assets and liabilities | (3,623) | (8,196) | 3,635
Net cash provided by operating activities | 63,368 | 40,721 | 40,608
Cash flows from investing activities |  |  |
Capital expenditures | (57,230) | (46,500) | (57,391)
Advances to affiliates | (21,700) | 0 | 0
Other | 1,253 | 1,073 | 960
Net cash used in investing activities | (77,677) | (45,427) | (56,431)
Cash flows from financing activities |  |  |
Common stock dividends | (15,200) | (15,100) | (14,384)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (381) | (381) | (381)
Proceeds from issuance of common stock | 3,023 | 24,597 | 11,000
Proceeds from issuance of long-term debt | 10,000 | 25,000 | 40,000
Repayment of long-term debt | 0 |  | 0
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | (7,900) | (19,800)
Proceeds from issuance of short-term debt |  |  | 0
Repayment of short-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 |  |
Payments of obligations under finance leases | 0 |  |
Other | (61) | (120) | (377)
Net cash used in financing activities | (2,619) | 26,096 | 16,058
Net increase (decrease) in cash and equivalents | (16,928) | 21,390 | 235
Cash, cash equivalents and restricted cash, January 1 | 23,422 | 2,032 | 1,797
Cash, cash equivalents and restricted cash, December 31 | 6,494 | 23,422 | 2,032
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | 6,494 | 23,422 | 2,032
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
Allowance for equity funds used during construction | 0 | 0 | 0
Accrued environmental reserve |  |  | 0
Bill credits |  | 0 |
Other | 0 | 0 | 0
Changes in assets and liabilities |  |  |
Increase in accounts receivable | 0 | 0 | 0
Decrease (increase) in accrued unbilled revenues | 0 | 0 | 0
Increase in fuel oil stock | 0 | 0 | 0
Increase in materials and supplies | 0 | 0 | 0
Decrease in regulatory assets | 0 | 0 | 0
Increase 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
Change 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 to affiliates | 0 | 0 | 0
Other | 0 |  | (24)
Net cash used in investing activities | 0 | 0 | (24)
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 other bank borrowings with original maturities of three months or less |  | 0 | 0
Proceeds from issuance of short-term debt |  |  | 0
Repayment of short-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 |  |
Payments of obligations under finance leases | 0 |  |
Other | 0 | 0 | 0
Net cash used in financing activities | 0 | 0 | 0
Net increase (decrease) in cash and equivalents | 0 | 0 | (24)
Cash, cash equivalents and restricted cash, January 1 | 77 | 77 | 101
Cash, cash equivalents and restricted cash, December 31 | 77 | 77 | 77
Less: Restricted cash | 0 | 0 | 0
Cash and cash equivalents | 77 | 77 | 77
Hawaiian Electric Company, Inc. and Subsidiaries | Consolidating adjustments |  |  |
Cash flows from operating activities |  |  |
Net income (loss) | (47,493) | (45,353) | (47,504)
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Equity in earnings of subsidiaries | 47,493 | 45,353 | 47,504
Common stock dividends received from subsidiaries | (31,600) | (29,700) | (30,704)
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
Allowance for equity funds used during construction | 0 | 0 | 0
Accrued environmental reserve |  |  | 0
Bill credits |  | 0 |
Other | 0 | 0 | 0
Changes in assets and liabilities |  |  |
Increase in accounts receivable | 4,649 | 1,540 | 5,499
Decrease (increase) in accrued unbilled revenues | 0 | 0 | 0
Increase in fuel oil stock | 0 | 0 | 0
Increase in materials and supplies | 0 | 0 | 0
Decrease in regulatory assets | 0 | 0 | 0
Increase in regulatory liabilities | 0 |  |
Increase in accounts payable | 0 | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes | 0 | (86) | 58
Decrease in defined benefit pension and other postretirement benefit plans liability | 0 | 0 | 0
Change in other assets and liabilities | (4,649) | (1,540) | (5,499)
Net cash provided by operating activities | (31,600) | (29,786) | (30,646)
Cash flows from investing activities |  |  |
Capital expenditures | 0 | 0 | 0
Advances to affiliates | 25,200 | (25,700) | (9,000)
Other | 9,046 | 33,486 | 18,442
Net cash used in investing activities | 34,246 | 7,786 | 9,442
Cash flows from financing activities |  |  |
Common stock dividends | 31,600 | 29,700 | 30,704
Preferred stock dividends of Hawaiian Electric and subsidiaries | 0 | 0 | 0
Proceeds from issuance of common stock | (9,046) | (33,400) | (18,500)
Proceeds from issuance of long-term debt | 0 | 0 | 0
Repayment of long-term debt | 0 |  | 0
Net increase (decrease) in other bank borrowings with original maturities of three months or less |  | 25,700 | 9,000
Proceeds from issuance of short-term debt |  |  | 0
Repayment of short-term debt |  | 0 | 0
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | (25,200) |  |
Payments of obligations under finance leases | 0 |  |
Other | 0 | 0 | 0
Net cash used in financing activities | (2,646) | 22,000 | 21,204
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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