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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Utility property, plant and equipment |  |  |  |
Total property, plant and equipment, net | $ 5,778,571 | $ 5,687,003 |  |
Current assets |  |  |  |
Cash and cash equivalents | 315,334 | 199,877 | $ 301,704 |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 110,920 | 115,684 |  |
Total assets | 16,443,785 | 16,284,244 |  |
Capitalization |  |  |  |
Common stock equity | 2,237,955 | 2,202,499 | 2,303,642 | $ 2,390,884
Preferred stock of subsidiaries - not subject to mandatory redemption | 34,293 | 34,293 |  |
Current liabilities |  |  |  |
Interest and preferred dividends payable | 41,382 | 21,333 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 273,081 | 262,462 |  |
Total liabilities and shareholders’ equity | 16,443,785 | 16,284,244 |  |
Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 52,060 | 52,060 |  |
Plant and equipment | 8,042,892 | 7,979,510 |  |
Finance lease right-of-use assets | 88,297 | 48,371 |  |
Less accumulated depreciation | (3,133,811) | (3,086,499) |  |
Construction in progress | 315,862 | 275,353 |  |
Utility property, plant and equipment, net | 5,365,300 | 5,268,795 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 6,945 | 6,945 |  |
Total property, plant and equipment, net | 5,372,245 | 5,275,740 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 116,022 | 39,242 | 29,055 |
Advances to affiliates |  | 0 |  |
Customer accounts receivable, net | 235,305 | 288,338 |  |
Accrued unbilled revenues, net | 160,532 | 183,280 |  |
Other accounts receivable, net | 11,427 | 13,567 |  |
Fuel oil stock, at average cost | 157,583 | 191,530 |  |
Materials and supplies, at average cost | 84,093 | 79,568 |  |
Prepayments and other | 43,909 | 33,482 |  |
Regulatory assets | 64,973 | 52,273 |  |
Total current assets | 873,844 | 881,280 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 84,930 | 89,318 |  |
Regulatory assets | 182,929 | 190,240 |  |
Other | 160,515 | 160,889 |  |
Total other long-term assets | 428,374 | 440,447 |  |
Total assets | 6,674,463 | 6,597,467 |  |
Capitalization |  |  |  |
Common stock equity | 2,358,884 | 2,344,170 | 2,276,884 | 2,261,899
Preferred stock of subsidiaries - not subject to mandatory redemption | 34,293 | 34,293 |  |
Long-term debt, net | 1,734,347 | 1,584,854 |  |
Total capitalization | 4,127,524 | 3,963,317 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 18,414 | 19,095 |  |
Current portion of long-term debt | 99,973 | 99,962 |  |
Short-term borrowings from affiliate |  | 0 |  |
Accounts payable | 191,769 | 202,492 |  |
Interest and preferred dividends payable | 29,367 | 17,176 |  |
Taxes accrued, including revenue taxes | 246,914 | 289,902 |  |
Regulatory liabilities | 25,234 | 31,475 |  |
Other | 86,580 | 85,596 |  |
Total current liabilities | 698,251 | 833,665 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 74,633 | 78,715 |  |
Finance lease liabilities | 84,341 | 46,048 |  |
Deferred income taxes | 384,953 | 384,430 |  |
Regulatory liabilities | 1,044,317 | 1,024,175 |  |
Unamortized tax credits | 93,445 | 95,300 |  |
Defined benefit pension and other postretirement benefit plans liability | 49,388 | 49,748 |  |
Other | 117,611 | 122,069 |  |
Total deferred credits and other liabilities | 1,848,688 | 1,800,485 |  |
Total liabilities and shareholders’ equity | 6,674,463 | 6,597,467 |  |
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric (parent only) |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 42,860 | 42,860 |  |
Plant and equipment | 5,302,293 | 5,260,685 |  |
Finance lease right-of-use assets | 88,297 | 48,371 |  |
Less accumulated depreciation | (1,889,007) | (1,855,150) |  |
Construction in progress | 248,788 | 215,560 |  |
Utility property, plant and equipment, net | 3,793,231 | 3,712,326 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 5,298 | 5,298 |  |
Total property, plant and equipment, net | 3,798,529 | 3,717,624 |  |
Investment in wholly owned subsidiaries, at equity | 705,212 | 701,833 |  |
Current assets |  |  |  |
Cash and cash equivalents | 49,393 | 27,579 | 19,894 |
Advances to affiliates |  | 0 |  |
Customer accounts receivable, net | 172,426 | 216,802 |  |
Accrued unbilled revenues, net | 118,035 | 136,508 |  |
Other accounts receivable, net | 22,376 | 23,746 |  |
Fuel oil stock, at average cost | 116,295 | 153,342 |  |
Materials and supplies, at average cost | 50,744 | 48,130 |  |
Prepayments and other | 33,369 | 24,040 |  |
Regulatory assets | 58,943 | 46,504 |  |
Total current assets | 621,581 | 676,651 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 40,724 | 42,752 |  |
Regulatory assets | 151,684 | 154,040 |  |
Other | 113,888 | 115,028 |  |
Total other long-term assets | 306,296 | 311,820 |  |
Total assets | 5,431,618 | 5,407,928 |  |
Capitalization |  |  |  |
Common stock equity | 2,358,884 | 2,344,170 | 2,276,884 | 2,261,899
Preferred stock of subsidiaries - not subject to mandatory redemption | 22,293 | 22,293 |  |
Long-term debt, net | 1,226,587 | 1,126,915 |  |
Total capitalization | 3,607,764 | 3,493,378 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 8,955 | 9,775 |  |
Current portion of long-term debt | 49,987 | 49,981 |  |
Short-term borrowings from affiliate |  | 26,200 |  |
Accounts payable | 146,125 | 143,253 |  |
Interest and preferred dividends payable | 20,788 | 12,398 |  |
Taxes accrued, including revenue taxes | 178,418 | 207,798 |  |
Regulatory liabilities | 9,505 | 13,145 |  |
Other | 61,360 | 64,659 |  |
Total current liabilities | 475,138 | 615,176 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 39,387 | 41,049 |  |
Finance lease liabilities | 84,341 | 46,048 |  |
Deferred income taxes | 271,588 | 271,234 |  |
Regulatory liabilities | 745,894 | 729,683 |  |
Unamortized tax credits | 68,123 | 69,614 |  |
Defined benefit pension and other postretirement benefit plans liability | 65,917 | 65,907 |  |
Other | 73,466 | 75,839 |  |
Total deferred credits and other liabilities | 1,348,716 | 1,299,374 |  |
Total liabilities and shareholders’ equity | 5,431,618 | 5,407,928 |  |
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 5,606 | 5,606 |  |
Plant and equipment | 1,431,852 | 1,425,442 |  |
Finance lease right-of-use assets | 0 | 0 |  |
Less accumulated depreciation | (651,463) | (644,457) |  |
Construction in progress | 28,136 | 23,989 |  |
Utility property, plant and equipment, net | 814,131 | 810,580 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 115 | 115 |  |
Total property, plant and equipment, net | 814,246 | 810,695 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 28,006 | 5,092 | 6,017 |
Advances to affiliates |  | 4,500 |  |
Customer accounts receivable, net | 34,224 | 39,339 |  |
Accrued unbilled revenues, net | 21,831 | 23,839 |  |
Other accounts receivable, net | 3,883 | 5,519 |  |
Fuel oil stock, at average cost | 16,678 | 16,964 |  |
Materials and supplies, at average cost | 10,578 | 9,783 |  |
Prepayments and other | 5,025 | 6,346 |  |
Regulatory assets | 2,575 | 2,435 |  |
Total current assets | 122,800 | 113,817 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 32,599 | 34,283 |  |
Regulatory assets | 19,041 | 21,816 |  |
Other | 32,786 | 32,654 |  |
Total other long-term assets | 84,426 | 88,753 |  |
Total assets | 1,021,472 | 1,013,265 |  |
Capitalization |  |  |  |
Common stock equity | 346,629 | 344,720 | 336,177 | 332,900
Preferred stock of subsidiaries - not subject to mandatory redemption | 7,000 | 7,000 |  |
Long-term debt, net | 249,346 | 224,439 |  |
Total capitalization | 602,975 | 576,159 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 6,780 | 6,690 |  |
Current portion of long-term debt | 19,994 | 19,992 |  |
Short-term borrowings from affiliate |  | 0 |  |
Accounts payable | 20,957 | 32,113 |  |
Interest and preferred dividends payable | 3,839 | 2,576 |  |
Taxes accrued, including revenue taxes | 34,570 | 42,436 |  |
Regulatory liabilities | 7,918 | 8,553 |  |
Other | 21,072 | 20,856 |  |
Total current liabilities | 115,130 | 133,216 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 26,087 | 27,817 |  |
Finance lease liabilities | 0 | 0 |  |
Deferred income taxes | 50,657 | 50,615 |  |
Regulatory liabilities | 195,238 | 194,222 |  |
Unamortized tax credits | 12,903 | 13,150 |  |
Defined benefit pension and other postretirement benefit plans liability | 0 | 129 |  |
Other | 18,482 | 17,957 |  |
Total deferred credits and other liabilities | 303,367 | 303,890 |  |
Total liabilities and shareholders’ equity | 1,021,472 | 1,013,265 |  |
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 3,594 | 3,594 |  |
Plant and equipment | 1,308,747 | 1,293,383 |  |
Finance lease right-of-use assets | 0 | 0 |  |
Less accumulated depreciation | (593,341) | (586,892) |  |
Construction in progress | 38,938 | 35,804 |  |
Utility property, plant and equipment, net | 757,938 | 745,889 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 1,532 | 1,532 |  |
Total property, plant and equipment, net | 759,470 | 747,421 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 38,546 | 6,494 | 3,067 |
Advances to affiliates |  | 21,700 |  |
Customer accounts receivable, net | 28,655 | 32,197 |  |
Accrued unbilled revenues, net | 20,666 | 22,933 |  |
Other accounts receivable, net | 4,677 | 6,686 |  |
Fuel oil stock, at average cost | 24,610 | 21,224 |  |
Materials and supplies, at average cost | 22,771 | 21,655 |  |
Prepayments and other | 5,515 | 4,137 |  |
Regulatory assets | 3,455 | 3,334 |  |
Total current assets | 148,895 | 140,360 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 11,607 | 12,283 |  |
Regulatory assets | 12,204 | 14,384 |  |
Other | 30,402 | 29,495 |  |
Total other long-term assets | 54,213 | 56,162 |  |
Total assets | 962,578 | 943,943 |  |
Capitalization |  |  |  |
Common stock equity | 358,506 | 357,036 | 345,744 | 343,260
Preferred stock of subsidiaries - not subject to mandatory redemption | 5,000 | 5,000 |  |
Long-term debt, net | 258,414 | 233,500 |  |
Total capitalization | 621,920 | 595,536 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 2,679 | 2,630 |  |
Current portion of long-term debt | 29,992 | 29,989 |  |
Short-term borrowings from affiliate |  | 0 |  |
Accounts payable | 24,687 | 27,126 |  |
Interest and preferred dividends payable | 4,740 | 2,282 |  |
Taxes accrued, including revenue taxes | 33,926 | 40,709 |  |
Regulatory liabilities | 7,811 | 9,777 |  |
Other | 23,657 | 22,385 |  |
Total current liabilities | 127,492 | 134,898 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 9,159 | 9,849 |  |
Finance lease liabilities | 0 | 0 |  |
Deferred income taxes | 62,708 | 62,581 |  |
Regulatory liabilities | 103,185 | 100,270 |  |
Unamortized tax credits | 12,419 | 12,536 |  |
Defined benefit pension and other postretirement benefit plans liability | 0 | 0 |  |
Other | 25,695 | 28,273 |  |
Total deferred credits and other liabilities | 213,166 | 213,509 |  |
Total liabilities and shareholders’ equity | 962,578 | 943,943 |  |
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 0 | 0 |  |
Finance lease right-of-use assets | 0 | 0 |  |
Less accumulated depreciation | 0 | 0 |  |
Construction in progress | 0 | 0 |  |
Utility property, plant and equipment, net | 0 | 0 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 0 | 0 |  |
Total property, plant and equipment, net | 0 | 0 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 77 | 77 | 77 |
Advances to affiliates |  | 0 |  |
Customer accounts receivable, net | 0 | 0 |  |
Accrued unbilled revenues, net | 0 | 0 |  |
Other accounts receivable, net | 0 | 0 |  |
Fuel oil stock, at average cost | 0 | 0 |  |
Materials and supplies, at average cost | 0 | 0 |  |
Prepayments and other | 0 | 0 |  |
Regulatory assets | 0 | 0 |  |
Total current assets | 77 | 77 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 0 | 0 |  |
Regulatory assets | 0 | 0 |  |
Other | 0 | 0 |  |
Total other long-term assets | 0 | 0 |  |
Total assets | 77 | 77 |  |
Capitalization |  |  |  |
Common stock equity | 77 | 77 | 77 | 77
Preferred stock of subsidiaries - not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | 77 | 77 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 0 | 0 |  |
Current portion of long-term debt | 0 | 0 |  |
Short-term borrowings from affiliate |  | 0 |  |
Accounts payable | 0 | 0 |  |
Interest and preferred dividends payable | 0 | 0 |  |
Taxes accrued, including revenue taxes | 0 | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Other | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 0 | 0 |  |
Finance lease liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Unamortized tax credits | 0 | 0 |  |
Defined benefit pension and other postretirement benefit plans liability | 0 | 0 |  |
Other | 0 |  |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Total liabilities and shareholders’ equity | 77 | 77 |  |
Hawaiian Electric Consolidated | Consolidating adjustments |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 0 | 0 |  |
Finance lease right-of-use assets | 0 | 0 |  |
Less accumulated depreciation | 0 | 0 |  |
Construction in progress | 0 | 0 |  |
Utility property, plant and equipment, net | 0 | 0 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 0 | 0 |  |
Total property, plant and equipment, net | 0 | 0 |  |
Investment in wholly owned subsidiaries, at equity | (705,212) | (701,833) |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |
Advances to affiliates |  | (26,200) |  |
Customer accounts receivable, net | 0 | 0 |  |
Accrued unbilled revenues, net | 0 | 0 |  |
Other accounts receivable, net | (19,509) | (22,384) |  |
Fuel oil stock, at average cost | 0 | 0 |  |
Materials and supplies, at average cost | 0 | 0 |  |
Prepayments and other | 0 | (1,041) |  |
Regulatory assets | 0 | 0 |  |
Total current assets | (19,509) | (49,625) |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 0 | 0 |  |
Regulatory assets | 0 | 0 |  |
Other | (16,561) | (16,288) |  |
Total other long-term assets | (16,561) | (16,288) |  |
Total assets | (741,282) | (767,746) |  |
Capitalization |  |  |  |
Common stock equity | (705,212) | (701,833) | $ (681,998) | $ (676,237)
Preferred stock of subsidiaries - not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | (705,212) | (701,833) |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 0 | 0 |  |
Current portion of long-term debt | 0 | 0 |  |
Short-term borrowings from affiliate |  | (26,200) |  |
Accounts payable | 0 | 0 |  |
Interest and preferred dividends payable | 0 | (80) |  |
Taxes accrued, including revenue taxes | 0 | (1,041) |  |
Regulatory liabilities | 0 | 0 |  |
Other | (19,509) | (22,304) |  |
Total current liabilities | (19,509) | (49,625) |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 0 | 0 |  |
Finance lease liabilities | 0 | 0 |  |
Deferred income taxes | 0 | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Unamortized tax credits | 0 | 0 |  |
Defined benefit pension and other postretirement benefit plans liability | (16,529) | (16,288) |  |
Other | (32) | 0 |  |
Total deferred credits and other liabilities | (16,561) | (16,288) |  |
Total liabilities and shareholders’ equity | $ (741,282) | $ (767,746) |  |

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |