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Electric utility segment - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Utility property, plant and equipment |  |  |  |
Total property, plant and equipment, net | $ 6,183,503 | $ 6,150,126 |  |
Current assets |  |  |  |
Cash and cash equivalents | 485,192 | 679,546 | $ 315,334 |
Restricted cash | 17,531 | 15,028 | 4,216 |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 91,182 | 94,905 |  |
Total assets | 16,923,208 | 17,243,821 |  |
Capitalization |  |  |  |
Common stock equity | 2,377,380 | 2,344,841 | 2,237,955 | $ 2,202,499
Preferred stock of subsidiaries - not subject to mandatory redemption | 34,293 | 34,293 |  |
Current liabilities |  |  |  |
Interest and dividends payable | 61,452 | 51,206 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 299,012 | 297,954 |  |
Total liabilities and shareholders’ equity | 16,923,208 | 17,243,821 |  |
Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 52,019 | 52,098 |  |
Plant and equipment | 8,302,449 | 8,232,810 |  |
Financing lease right-of-use assets | 354,401 | 342,174 |  |
Less accumulated depreciation | (3,249,089) | (3,197,514) |  |
Construction in progress | 330,743 | 320,223 |  |
Utility property, plant and equipment, net | 5,790,523 | 5,749,791 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 6,941 | 6,942 |  |
Total property, plant and equipment, net | 5,797,464 | 5,756,733 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 129,754 | 106,077 | 116,022 |
Restricted cash | 2,000 | 2,000 | 0 |
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 209,999 | 244,309 |  |
Accrued unbilled revenues, net | 171,455 | 185,644 |  |
Other accounts receivable, net | 38,025 | 111,519 |  |
Fuel oil stock, at average cost | 161,433 | 148,237 |  |
Materials and supplies, at average cost | 115,719 | 114,433 |  |
Prepayments and other | 72,025 | 58,491 |  |
Regulatory assets | 82,503 | 68,453 |  |
Total current assets | 982,913 | 1,039,163 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 68,217 | 71,877 |  |
Regulatory assets | 232,564 | 226,351 |  |
Other | 193,704 | 189,430 |  |
Total other long-term assets | 494,485 | 487,658 |  |
Total assets | 7,274,862 | 7,283,554 |  |
Capitalization |  |  |  |
Common stock equity | 2,435,282 | 2,409,110 | 2,358,884 | 2,344,170
Preferred stock of subsidiaries - not subject to mandatory redemption | 34,293 | 34,293 |  |
Long-term debt, net | 1,886,028 | 1,934,277 |  |
Total capitalization | 4,355,603 | 4,377,680 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 16,234 | 16,617 |  |
Current portion of long-term debt | 46,931 | 0 |  |
Accounts payable | 198,636 | 191,040 |  |
Interest and dividends payable | 43,926 | 22,882 |  |
Taxes accrued, including revenue taxes | 282,446 | 291,942 |  |
Regulatory liabilities | 26,149 | 36,559 |  |
Other | 108,006 | 171,436 |  |
Total current liabilities | 722,328 | 730,476 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 58,399 | 62,098 |  |
Finance lease liabilities | 341,141 | 330,978 |  |
Deferred income taxes | 403,761 | 399,001 |  |
Regulatory liabilities | 1,133,662 | 1,114,131 |  |
Unamortized tax credits | 81,771 | 84,312 |  |
Defined benefit pension and other postretirement benefit plans liability | 62,331 | 60,671 |  |
Other | 115,866 | 124,207 |  |
Total deferred credits and other liabilities | 2,196,931 | 2,175,398 |  |
Total liabilities and shareholders’ equity | 7,274,862 | 7,283,554 |  |
Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Consolidating adjustments | Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 0 | 0 |  |
Financing 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 | (728,222) | (722,211) |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 |
Restricted cash | 0 | 0 |  |
Advances to affiliates | (93,000) | (70,500) |  |
Customer accounts receivable, net | 0 | 0 |  |
Accrued unbilled revenues, net | 0 | 0 |  |
Other accounts receivable, net | (38,307) | (77,480) |  |
Fuel oil stock, at average cost | 0 | 0 |  |
Materials and supplies, at average cost | 0 | 0 |  |
Prepayments and other | (1,434) | (1,638) |  |
Regulatory assets | 0 | 0 |  |
Total current assets | (132,741) | (149,618) |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 0 | 0 |  |
Regulatory assets | 0 | 0 |  |
Other | (14,484) | (14,171) |  |
Total other long-term assets | (14,484) | (14,171) |  |
Total assets | (875,447) | (886,000) |  |
Capitalization |  |  |  |
Common stock equity | (728,222) | (722,211) | (705,212) | (701,833)
Preferred stock of subsidiaries - not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | (728,222) | (722,211) |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 0 | 0 |  |
Current portion of long-term debt | 0 |  |  |
Accounts payable | 0 | 0 |  |
Interest and dividends payable | (547) | (375) |  |
Taxes accrued, including revenue taxes | (1,434) | (1,638) |  |
Regulatory liabilities | 0 | 0 |  |
Other | (37,760) | (77,105) |  |
Total current liabilities | (132,741) | (149,618) |  |
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 | (14,484) | (14,171) |  |
Other | 0 | 0 |  |
Total deferred credits and other liabilities | (14,484) | (14,171) |  |
Total liabilities and shareholders’ equity | (875,447) | (886,000) |  |
Consolidating adjustments | Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | (93,000) | (70,500) |  |
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 42,860 | 42,859 |  |
Plant and equipment | 5,442,481 | 5,398,281 |  |
Financing lease right-of-use assets | 318,326 | 306,099 |  |
Less accumulated depreciation | (1,962,980) | (1,925,660) |  |
Construction in progress | 249,111 | 247,836 |  |
Utility property, plant and equipment, net | 4,089,798 | 4,069,415 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 5,294 | 5,295 |  |
Total property, plant and equipment, net | 4,095,092 | 4,074,710 |  |
Investment in wholly owned subsidiaries, at equity | 728,222 | 722,211 |  |
Current assets |  |  |  |
Cash and cash equivalents | 111,200 | 89,755 | 49,393 |
Restricted cash | 2,000 | 2,000 |  |
Advances to affiliates | 93,000 | 70,500 |  |
Customer accounts receivable, net | 148,241 | 172,747 |  |
Accrued unbilled revenues, net | 124,691 | 136,367 |  |
Other accounts receivable, net | 47,107 | 143,160 |  |
Fuel oil stock, at average cost | 121,468 | 108,228 |  |
Materials and supplies, at average cost | 65,457 | 64,334 |  |
Prepayments and other | 52,174 | 40,767 |  |
Regulatory assets | 69,284 | 58,920 |  |
Total current assets | 834,622 | 886,778 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 33,628 | 34,856 |  |
Regulatory assets | 194,038 | 189,417 |  |
Other | 138,076 | 134,033 |  |
Total other long-term assets | 365,742 | 358,306 |  |
Total assets | 6,023,678 | 6,042,005 |  |
Capitalization |  |  |  |
Common stock equity | 2,435,282 | 2,409,110 | 2,358,884 | 2,344,170
Preferred stock of subsidiaries - not subject to mandatory redemption | 22,293 | 22,293 |  |
Long-term debt, net | 1,385,625 | 1,426,516 |  |
Total capitalization | 3,843,200 | 3,857,919 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 6,298 | 6,788 |  |
Current portion of long-term debt | 39,941 |  |  |
Accounts payable | 139,015 | 136,102 |  |
Interest and dividends payable | 35,795 | 17,085 |  |
Taxes accrued, including revenue taxes | 219,385 | 211,840 |  |
Regulatory liabilities | 11,488 | 20,013 |  |
Other | 81,609 | 165,131 |  |
Total current liabilities | 533,531 | 556,959 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 33,090 | 34,262 |  |
Finance lease liabilities | 306,262 | 295,935 |  |
Deferred income taxes | 283,734 | 280,029 |  |
Regulatory liabilities | 817,663 | 803,404 |  |
Unamortized tax credits | 59,188 | 61,130 |  |
Defined benefit pension and other postretirement benefit plans liability | 76,815 | 74,842 |  |
Other | 70,195 | 77,525 |  |
Total deferred credits and other liabilities | 1,646,947 | 1,627,127 |  |
Total liabilities and shareholders’ equity | 6,023,678 | 6,042,005 |  |
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 5,645 | 5,645 |  |
Plant and equipment | 1,470,238 | 1,459,639 |  |
Financing lease right-of-use assets | 36,075 | 36,075 |  |
Less accumulated depreciation | (673,926) | (666,581) |  |
Construction in progress | 36,013 | 33,488 |  |
Utility property, plant and equipment, net | 874,045 | 868,266 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 115 | 115 |  |
Total property, plant and equipment, net | 874,160 | 868,381 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 11,146 | 10,658 | 28,006 |
Restricted cash | 0 | 0 |  |
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 32,461 | 38,216 |  |
Accrued unbilled revenues, net | 24,052 | 25,102 |  |
Other accounts receivable, net | 7,619 | 13,318 |  |
Fuel oil stock, at average cost | 15,596 | 17,968 |  |
Materials and supplies, at average cost | 14,470 | 14,397 |  |
Prepayments and other | 6,713 | 7,724 |  |
Regulatory assets | 6,484 | 5,771 |  |
Total current assets | 118,541 | 133,154 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 25,733 | 27,470 |  |
Regulatory assets | 14,050 | 13,575 |  |
Other | 36,846 | 36,439 |  |
Total other long-term assets | 76,629 | 77,484 |  |
Total assets | 1,069,330 | 1,079,019 |  |
Capitalization |  |  |  |
Common stock equity | 364,177 | 359,790 | 346,629 | 344,720
Preferred stock of subsidiaries - not subject to mandatory redemption | 7,000 | 7,000 |  |
Long-term debt, net | 244,251 | 249,339 |  |
Total capitalization | 615,428 | 616,129 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 7,098 | 7,025 |  |
Current portion of long-term debt | 4,992 |  |  |
Accounts payable | 28,690 | 29,418 |  |
Interest and dividends payable | 3,808 | 3,098 |  |
Taxes accrued, including revenue taxes | 34,955 | 43,932 |  |
Regulatory liabilities | 8,353 | 8,508 |  |
Other | 27,837 | 33,240 |  |
Total current liabilities | 115,733 | 125,221 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 18,989 | 20,792 |  |
Finance lease liabilities | 34,879 | 35,043 |  |
Deferred income taxes | 51,699 | 51,661 |  |
Regulatory liabilities | 202,178 | 199,173 |  |
Unamortized tax credits | 11,351 | 11,650 |  |
Defined benefit pension and other postretirement benefit plans liability | 0 | 0 |  |
Other | 19,073 | 19,350 |  |
Total deferred credits and other liabilities | 338,169 | 337,669 |  |
Total liabilities and shareholders’ equity | 1,069,330 | 1,079,019 |  |
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 3,514 | 3,594 |  |
Plant and equipment | 1,389,730 | 1,374,890 |  |
Financing lease right-of-use assets | 0 | 0 |  |
Less accumulated depreciation | (612,183) | (605,273) |  |
Construction in progress | 45,619 | 38,899 |  |
Utility property, plant and equipment, net | 826,680 | 812,110 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 1,532 | 1,532 |  |
Total property, plant and equipment, net | 828,212 | 813,642 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 7,331 | 5,587 | 38,546 |
Restricted cash | 0 | 0 |  |
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 29,297 | 33,346 |  |
Accrued unbilled revenues, net | 22,712 | 24,175 |  |
Other accounts receivable, net | 21,606 | 32,521 |  |
Fuel oil stock, at average cost | 24,369 | 22,041 |  |
Materials and supplies, at average cost | 35,792 | 35,702 |  |
Prepayments and other | 14,572 | 11,638 |  |
Regulatory assets | 6,735 | 3,762 |  |
Total current assets | 162,414 | 168,772 |  |
Other long-term assets |  |  |  |
Operating lease right-of-use assets | 8,856 | 9,551 |  |
Regulatory assets | 24,476 | 23,359 |  |
Other | 33,266 | 33,129 |  |
Total other long-term assets | 66,598 | 66,039 |  |
Total assets | 1,057,224 | 1,048,453 |  |
Capitalization |  |  |  |
Common stock equity | 363,968 | 362,344 | 358,506 | 357,036
Preferred stock of subsidiaries - not subject to mandatory redemption | 5,000 | 5,000 |  |
Long-term debt, net | 256,152 | 258,422 |  |
Total capitalization | 625,120 | 625,766 |  |
Current liabilities |  |  |  |
Current portion of operating lease liabilities | 2,838 | 2,804 |  |
Current portion of long-term debt | 1,998 |  |  |
Accounts payable | 30,931 | 25,520 |  |
Interest and dividends payable | 4,870 | 3,074 |  |
Taxes accrued, including revenue taxes | 29,540 | 37,808 |  |
Regulatory liabilities | 6,308 | 8,038 |  |
Other | 36,320 | 50,170 |  |
Total current liabilities | 205,805 | 197,914 |  |
Deferred credits and other liabilities |  |  |  |
Operating lease liabilities | 6,320 | 7,044 |  |
Finance lease liabilities | 0 | 0 |  |
Deferred income taxes | 68,328 | 67,311 |  |
Regulatory liabilities | 113,821 | 111,554 |  |
Unamortized tax credits | 11,232 | 11,532 |  |
Defined benefit pension and other postretirement benefit plans liability | 0 | 0 |  |
Other | 26,598 | 27,332 |  |
Total deferred credits and other liabilities | 226,299 | 224,773 |  |
Total liabilities and shareholders’ equity | 1,057,224 | 1,048,453 |  |
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | 93,000 | 70,500 |  |
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 0 | 0 |  |
Financing 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 |
Restricted cash | 0 | 0 |  |
Advances to affiliates | 0 | 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 |  |  |
Accounts payable | 0 | 0 |  |
Interest and 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 |  |
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity |  |  |  |
Current liabilities |  |  |  |
Short-term borrowings from non-affiliates | $ 0 | $ 0 |  |

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