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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Utility property, plant and equipment |  |  |  |
Total property, plant and equipment, net | $ 4,694,101 | $ 4,460,248 |  |
Current assets |  |  |  |
Cash and cash equivalents | 172,054 | 261,881 | $ 202,173 | $ 278,452
Other long-term assets |  |  |  |
Total assets | 12,911,554 | 12,534,160 |  |
Capitalization |  |  |  |
Common stock equity | 2,132,045 | 2,097,386 | 2,103,022 | 2,066,753
Cumulative preferred stock—not subject to mandatory redemption | 0 | 0 |  |
Current liabilities |  |  |  |
Interest and preferred dividends payable | 30,280 | 25,837 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 385,651 | 388,430 |  |
Total liabilities and shareholders’ equity | 12,911,554 | 12,534,160 |  |
Consolidating adjustments |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 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 | (571,574) | (557,013) |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Advances to affiliates | (2,000) | (12,000) |  |
Customer accounts receivable, net | 0 | 0 |  |
Accrued unbilled revenues, net | 0 | 0 |  |
Other accounts receivable, net | (9,355) | (7,691) |  |
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 | (11,355) | (19,691) |  |
Other long-term assets |  |  |  |
Regulatory assets | 0 | 0 |  |
Other | 0 | 0 |  |
Total other long-term assets | 0 | 0 |  |
Total assets | (582,929) | (576,704) |  |
Capitalization |  |  |  |
Common stock equity | (571,574) | (557,013) | (559,671) | (550,946)
Cumulative preferred stock—not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | (571,574) | (557,013) |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 0 | 0 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | (2,000) | (12,000) |  |
Accounts payable | 0 | 0 |  |
Interest and preferred dividends payable | (9) | (11) |  |
Taxes accrued | 0 | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Other | (9,346) | (7,680) |  |
Total current liabilities | (11,355) | (19,691) |  |
Deferred credits and other liabilities |  |  |  |
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 | 0 |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Total liabilities and shareholders’ equity | (582,929) | (576,704) |  |
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 44,030 | 43,972 |  |
Plant and equipment | 4,404,946 | 4,140,892 |  |
Less accumulated depreciation | (1,513,351) | (1,451,612) |  |
Construction in progress | 154,566 | 231,571 |  |
Utility property, plant and equipment, net | 3,090,191 | 2,964,823 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 5,933 | 5,933 |  |
Total property, plant and equipment, net | 3,096,124 | 2,970,756 |  |
Investment in wholly owned subsidiaries, at equity | 571,574 | 557,013 |  |
Current assets |  |  |  |
Cash and cash equivalents | 3,867 | 2,059 | 3,454 | 61,388
Advances to affiliates | 2,000 | 0 |  |
Customer accounts receivable, net | 124,792 | 86,987 |  |
Accrued unbilled revenues, net | 94,956 | 77,176 |  |
Other accounts receivable, net | 10,312 | 11,376 |  |
Fuel oil stock, at average cost | 61,110 | 64,972 |  |
Materials and supplies, at average cost | 32,407 | 28,325 |  |
Prepayments and other | 44,458 | 17,928 |  |
Regulatory assets | 75,541 | 76,203 |  |
Total current assets | 449,443 | 365,026 |  |
Other long-term assets |  |  |  |
Regulatory assets | 527,650 | 557,464 |  |
Other | 77,899 | 60,157 |  |
Total other long-term assets | 605,549 | 617,621 |  |
Total assets | 4,722,690 | 4,510,416 |  |
Capitalization |  |  |  |
Common stock equity | 1,876,237 | 1,845,283 | 1,829,075 | 1,799,787
Cumulative preferred stock—not subject to mandatory redemption | 22,293 | 22,293 |  |
Long-term debt, net | 1,000,020 | 924,979 |  |
Total capitalization | 2,898,550 | 2,792,555 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 29,996 | 29,978 |  |
Short-term borrowings from non-affiliates | 85,913 | 4,999 |  |
Short-term borrowings from affiliate | 0 | 12,000 |  |
Accounts payable | 90,937 | 121,328 |  |
Interest and preferred dividends payable | 19,994 | 15,677 |  |
Taxes accrued | 136,485 | 133,839 |  |
Regulatory liabilities | 3,124 | 607 |  |
Other | 64,697 | 43,121 |  |
Total current liabilities | 431,146 | 361,549 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 285,789 | 281,223 |  |
Regulatory liabilities | 649,761 | 613,329 |  |
Unamortized tax credits | 61,299 | 59,039 |  |
Defined benefit pension and other postretirement benefit plans liability | 332,743 | 340,983 |  |
Other | 63,402 | 61,738 |  |
Total deferred credits and other liabilities | 1,392,994 | 1,356,312 |  |
Total liabilities and shareholders’ equity | 4,722,690 | 4,510,416 |  |
HELCO | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 5,873 | 6,189 |  |
Plant and equipment | 1,227,530 | 1,206,776 |  |
Less accumulated depreciation | (541,451) | (528,024) |  |
Construction in progress | 11,060 | 8,182 |  |
Utility property, plant and equipment, net | 703,012 | 693,123 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 115 | 115 |  |
Total property, plant and equipment, net | 703,127 | 693,238 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 3,027 | 4,025 | 4,714 | 10,749
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 29,364 | 22,510 |  |
Accrued unbilled revenues, net | 15,810 | 15,940 |  |
Other accounts receivable, net | 1,352 | 2,268 |  |
Fuel oil stock, at average cost | 11,483 | 8,698 |  |
Materials and supplies, at average cost | 7,840 | 8,041 |  |
Prepayments and other | 8,604 | 4,514 |  |
Regulatory assets | 6,217 | 5,038 |  |
Total current assets | 83,697 | 71,034 |  |
Other long-term assets |  |  |  |
Regulatory assets | 115,114 | 122,783 |  |
Other | 20,363 | 16,311 |  |
Total other long-term assets | 135,477 | 139,094 |  |
Total assets | 922,301 | 903,366 |  |
Capitalization |  |  |  |
Common stock equity | 294,220 | 286,647 | 294,319 | 291,291
Cumulative preferred stock—not subject to mandatory redemption | 7,000 | 7,000 |  |
Long-term debt, net | 217,724 | 202,701 |  |
Total capitalization | 518,944 | 496,348 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 10,998 | 10,992 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | 0 | 0 |  |
Accounts payable | 12,289 | 17,855 |  |
Interest and preferred dividends payable | 4,243 | 4,174 |  |
Taxes accrued | 30,829 | 34,950 |  |
Regulatory liabilities | 2,850 | 1,245 |  |
Other | 9,594 | 9,818 |  |
Total current liabilities | 70,803 | 79,034 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 56,417 | 56,955 |  |
Regulatory liabilities | 174,739 | 169,139 |  |
Unamortized tax credits | 16,271 | 16,167 |  |
Defined benefit pension and other postretirement benefit plans liability | 64,026 | 66,447 |  |
Other | 21,101 | 19,276 |  |
Total deferred credits and other liabilities | 332,554 | 327,984 |  |
Total liabilities and shareholders’ equity | 922,301 | 903,366 |  |
Maui Electric | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 3,612 | 3,016 |  |
Plant and equipment | 1,087,570 | 1,053,372 |  |
Less accumulated depreciation | (512,906) | (496,716) |  |
Construction in progress | 27,460 | 23,341 |  |
Utility property, plant and equipment, net | 605,736 | 583,013 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 1,532 | 1,532 |  |
Total property, plant and equipment, net | 607,268 | 584,545 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 229 | 6,332 | 1,718 | 2,048
Advances to affiliates | 0 | 12,000 |  |
Customer accounts receivable, net | 24,629 | 18,392 |  |
Accrued unbilled revenues, net | 16,936 | 13,938 |  |
Other accounts receivable, net | 1,069 | 1,210 |  |
Fuel oil stock, at average cost | 19,229 | 13,203 |  |
Materials and supplies, at average cost | 18,260 | 18,031 |  |
Prepayments and other | 7,670 | 2,913 |  |
Regulatory assets | 7,672 | 7,149 |  |
Total current assets | 95,694 | 93,168 |  |
Other long-term assets |  |  |  |
Regulatory assets | 98,730 | 100,660 |  |
Other | 18,272 | 15,061 |  |
Total other long-term assets | 117,002 | 115,721 |  |
Total assets | 819,964 | 793,434 |  |
Capitalization |  |  |  |
Common stock equity | 277,253 | 270,265 | 265,251 | 259,554
Cumulative preferred stock—not subject to mandatory redemption | 5,000 | 5,000 |  |
Long-term debt, net | 200,887 | 190,836 |  |
Total capitalization | 483,140 | 466,101 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 8,999 | 8,993 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | 2,000 | 0 |  |
Accounts payable | 19,706 | 20,427 |  |
Interest and preferred dividends payable | 4,030 | 2,735 |  |
Taxes accrued | 28,462 | 30,312 |  |
Regulatory liabilities | 4,185 | 1,549 |  |
Other | 16,109 | 14,197 |  |
Total current liabilities | 83,491 | 78,213 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 58,863 | 55,863 |  |
Regulatory liabilities | 97,693 | 94,901 |  |
Unamortized tax credits | 15,503 | 15,163 |  |
Defined benefit pension and other postretirement benefit plans liability | 63,510 | 65,518 |  |
Other | 17,764 | 17,675 |  |
Total deferred credits and other liabilities | 253,333 | 249,120 |  |
Total liabilities and shareholders’ equity | 819,964 | 793,434 |  |
Other subsidiaries | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 0 | 0 |  |
Plant and equipment | 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 | 101 | 101 | 101 | 101
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 | 101 | 101 |  |
Other long-term assets |  |  |  |
Regulatory assets | 0 | 0 |  |
Other | 0 | 0 |  |
Total other long-term assets | 0 | 0 |  |
Total assets | 101 | 101 |  |
Capitalization |  |  |  |
Common stock equity | 101 | 101 | 101 | 101
Cumulative preferred stock—not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | 101 | 101 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 0 | 0 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | 0 | 0 |  |
Accounts payable | 0 | 0 |  |
Interest and preferred dividends payable | 0 | 0 |  |
Taxes accrued | 0 | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Other | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Deferred credits and other liabilities |  |  |  |
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 | 0 |  |
Total deferred credits and other liabilities | 0 | 0 |  |
Total liabilities and shareholders’ equity | 101 | 101 |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 53,515 | 53,177 |  |
Plant and equipment | 6,720,046 | 6,401,040 |  |
Less accumulated depreciation | (2,567,708) | (2,476,352) |  |
Construction in progress | 193,086 | 263,094 |  |
Utility property, plant and equipment, net | 4,398,939 | 4,240,959 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 7,580 | 7,580 |  |
Total property, plant and equipment, net | 4,406,519 | 4,248,539 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 7,224 | 12,517 | 9,987 | 74,286
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 178,785 | 127,889 |  |
Accrued unbilled revenues, net | 127,702 | 107,054 |  |
Other accounts receivable, net | 3,378 | 7,163 |  |
Fuel oil stock, at average cost | 91,822 | 86,873 |  |
Materials and supplies, at average cost | 58,507 | 54,397 |  |
Prepayments and other | 60,732 | 25,355 |  |
Regulatory assets | 89,430 | 88,390 |  |
Total current assets | 617,580 | 509,638 |  |
Other long-term assets |  |  |  |
Regulatory assets | 741,494 | 780,907 |  |
Other | 116,534 | 91,529 |  |
Total other long-term assets | 858,028 | 872,436 |  |
Total assets | 5,882,127 | 5,630,613 |  |
Capitalization |  |  |  |
Common stock equity | 1,876,237 | 1,845,283 | $ 1,829,075 | $ 1,799,787
Cumulative preferred stock—not subject to mandatory redemption | 34,293 | 34,293 |  |
Long-term debt, net | 1,418,631 | 1,318,516 |  |
Total capitalization | 3,329,161 | 3,198,092 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 49,993 | 49,963 |  |
Short-term borrowings from non-affiliates | 85,913 | 4,999 |  |
Short-term borrowings from affiliate | 0 | 0 |  |
Accounts payable | 122,932 | 159,610 |  |
Interest and preferred dividends payable | 28,258 | 22,575 |  |
Taxes accrued | 195,776 | 199,101 |  |
Regulatory liabilities | 10,159 | 3,401 |  |
Other | 81,054 | 59,456 |  |
Total current liabilities | 574,085 | 499,105 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 401,069 | 394,041 |  |
Regulatory liabilities | 922,193 | 877,369 |  |
Unamortized tax credits | 93,073 | 90,369 |  |
Defined benefit pension and other postretirement benefit plans liability | 460,279 | 472,948 |  |
Other | 102,267 | 98,689 |  |
Total deferred credits and other liabilities | 1,978,881 | 1,933,416 |  |
Total liabilities and shareholders’ equity | $ 5,882,127 | $ 5,630,613 |  |

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