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Electric utility segment - Condensed consolidating balance sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Utility property, plant and equipment |  |  |  |
Total property, plant and equipment, net | $ 4,611,949 | $ 4,460,248 |  |
Current assets |  |  |  |
Cash and cash equivalents | 254,665 | 261,881 | $ 210,381 | $ 278,452
Other long-term assets |  |  |  |
Total assets | 12,884,104 | 12,534,160 |  |
Capitalization |  |  |  |
Common stock equity | 2,103,018 | 2,097,386 | 2,075,029 | 2,066,753
Cumulative preferred stock—not subject to mandatory redemption | 0 | 0 |  |
Current liabilities |  |  |  |
Interest and preferred dividends payable | 27,594 | 25,837 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 375,832 | 388,430 |  |
Total liabilities and shareholders’ equity | 12,884,104 | 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 | (561,764) | (557,013) |  |
Current assets |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Advances to affiliates | (6,600) | (12,000) |  |
Customer accounts receivable, net | 0 | 0 |  |
Accrued unbilled revenues, net | 0 | 0 |  |
Other accounts receivable, net | (7,446) | (7,691) |  |
Fuel oil stock, at average cost | 0 | 0 |  |
Materials and supplies, at average cost | 0 | 0 |  |
Prepayments and other | (1,514) | 0 |  |
Regulatory assets | 0 | 0 |  |
Total current assets | (15,560) | (19,691) |  |
Other long-term assets |  |  |  |
Regulatory assets | 0 | 0 |  |
Other | 0 | 0 |  |
Total other long-term assets | 0 | 0 |  |
Total assets | (577,324) | (576,704) |  |
Capitalization |  |  |  |
Common stock equity | (561,764) | (557,013) | (553,764) | (550,946)
Cumulative preferred stock—not subject to mandatory redemption | 0 | 0 |  |
Long-term debt, net | 0 | 0 |  |
Total capitalization | (561,764) | (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 | (6,600) | (12,000) |  |
Accounts payable | 0 | 0 |  |
Interest and preferred dividends payable | (14) | (11) |  |
Taxes accrued, including revenue taxes | (1,514) | 0 |  |
Regulatory liabilities | 0 | 0 |  |
Other | (7,432) | (7,680) |  |
Total current liabilities | (15,560) | (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 | (577,324) | (576,704) |  |
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 44,023 | 43,972 |  |
Plant and equipment | 4,363,195 | 4,140,892 |  |
Less accumulated depreciation | (1,491,505) | (1,451,612) |  |
Construction in progress | 127,343 | 231,571 |  |
Utility property, plant and equipment, net | 3,043,056 | 2,964,823 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 5,934 | 5,933 |  |
Total property, plant and equipment, net | 3,048,990 | 2,970,756 |  |
Investment in wholly owned subsidiaries, at equity | 561,764 | 557,013 |  |
Current assets |  |  |  |
Cash and cash equivalents | 13,922 | 2,059 | 29,988 | 61,388
Advances to affiliates | 5,600 | 0 |  |
Customer accounts receivable, net | 109,285 | 86,987 |  |
Accrued unbilled revenues, net | 80,239 | 77,176 |  |
Other accounts receivable, net | 10,657 | 11,376 |  |
Fuel oil stock, at average cost | 74,485 | 64,972 |  |
Materials and supplies, at average cost | 31,077 | 28,325 |  |
Prepayments and other | 21,482 | 17,928 |  |
Regulatory assets | 88,581 | 76,203 |  |
Total current assets | 435,328 | 365,026 |  |
Other long-term assets |  |  |  |
Regulatory assets | 538,925 | 557,464 |  |
Other | 71,486 | 60,157 |  |
Total other long-term assets | 610,411 | 617,621 |  |
Total assets | 4,656,493 | 4,510,416 |  |
Capitalization |  |  |  |
Common stock equity | 1,852,324 | 1,845,283 | 1,803,506 | 1,799,787
Cumulative preferred stock—not subject to mandatory redemption | 22,293 | 22,293 |  |
Long-term debt, net | 999,915 | 924,979 |  |
Total capitalization | 2,874,532 | 2,792,555 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 29,990 | 29,978 |  |
Short-term borrowings from non-affiliates | 91,880 | 4,999 |  |
Short-term borrowings from affiliate | 1,000 | 12,000 |  |
Accounts payable | 115,806 | 121,328 |  |
Interest and preferred dividends payable | 15,743 | 15,677 |  |
Taxes accrued, including revenue taxes | 120,513 | 133,839 |  |
Regulatory liabilities | 2,751 | 607 |  |
Other | 42,449 | 43,121 |  |
Total current liabilities | 420,132 | 361,549 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 277,599 | 281,223 |  |
Regulatory liabilities | 627,369 | 613,329 |  |
Unamortized tax credits | 60,893 | 59,039 |  |
Defined benefit pension and other postretirement benefit plans liability | 330,356 | 340,983 |  |
Other | 65,612 | 61,738 |  |
Total deferred credits and other liabilities | 1,361,829 | 1,356,312 |  |
Total liabilities and shareholders’ equity | 4,656,493 | 4,510,416 |  |
HELCO | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 5,876 | 6,189 |  |
Plant and equipment | 1,217,147 | 1,206,776 |  |
Less accumulated depreciation | (536,210) | (528,024) |  |
Construction in progress | 10,154 | 8,182 |  |
Utility property, plant and equipment, net | 696,967 | 693,123 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 115 | 115 |  |
Total property, plant and equipment, net | 697,082 | 693,238 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 4,516 | 4,025 | 7,104 | 10,749
Advances to affiliates | 1,000 | 0 |  |
Customer accounts receivable, net | 24,005 | 22,510 |  |
Accrued unbilled revenues, net | 15,243 | 15,940 |  |
Other accounts receivable, net | 2,561 | 2,268 |  |
Fuel oil stock, at average cost | 12,632 | 8,698 |  |
Materials and supplies, at average cost | 8,600 | 8,041 |  |
Prepayments and other | 6,329 | 4,514 |  |
Regulatory assets | 6,353 | 5,038 |  |
Total current assets | 81,239 | 71,034 |  |
Other long-term assets |  |  |  |
Regulatory assets | 118,000 | 122,783 |  |
Other | 19,378 | 16,311 |  |
Total other long-term assets | 137,378 | 139,094 |  |
Total assets | 915,699 | 903,366 |  |
Capitalization |  |  |  |
Common stock equity | 288,865 | 286,647 | 291,760 | 291,291
Cumulative preferred stock—not subject to mandatory redemption | 7,000 | 7,000 |  |
Long-term debt, net | 217,699 | 202,701 |  |
Total capitalization | 513,564 | 496,348 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 10,996 | 10,992 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | 0 | 0 |  |
Accounts payable | 17,405 | 17,855 |  |
Interest and preferred dividends payable | 4,203 | 4,174 |  |
Taxes accrued, including revenue taxes | 27,353 | 34,950 |  |
Regulatory liabilities | 2,499 | 1,245 |  |
Other | 10,223 | 9,818 |  |
Total current liabilities | 72,679 | 79,034 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 54,505 | 56,955 |  |
Regulatory liabilities | 173,305 | 169,139 |  |
Unamortized tax credits | 16,463 | 16,167 |  |
Defined benefit pension and other postretirement benefit plans liability | 64,175 | 66,447 |  |
Other | 21,008 | 19,276 |  |
Total deferred credits and other liabilities | 329,456 | 327,984 |  |
Total liabilities and shareholders’ equity | 915,699 | 903,366 |  |
Maui Electric | Reportable Legal Entities |  |  |  |
Utility property, plant and equipment |  |  |  |
Land | 3,015 | 3,016 |  |
Plant and equipment | 1,072,640 | 1,053,372 |  |
Less accumulated depreciation | (506,713) | (496,716) |  |
Construction in progress | 28,111 | 23,341 |  |
Utility property, plant and equipment, net | 597,053 | 583,013 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 1,532 | 1,532 |  |
Total property, plant and equipment, net | 598,585 | 584,545 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 2,321 | 6,332 | 5,389 | 2,048
Advances to affiliates | 0 | 12,000 |  |
Customer accounts receivable, net | 23,970 | 18,392 |  |
Accrued unbilled revenues, net | 15,357 | 13,938 |  |
Other accounts receivable, net | 1,124 | 1,210 |  |
Fuel oil stock, at average cost | 19,899 | 13,203 |  |
Materials and supplies, at average cost | 18,264 | 18,031 |  |
Prepayments and other | 2,943 | 2,913 |  |
Regulatory assets | 8,632 | 7,149 |  |
Total current assets | 92,510 | 93,168 |  |
Other long-term assets |  |  |  |
Regulatory assets | 99,919 | 100,660 |  |
Other | 17,731 | 15,061 |  |
Total other long-term assets | 117,650 | 115,721 |  |
Total assets | 808,745 | 793,434 |  |
Capitalization |  |  |  |
Common stock equity | 272,798 | 270,265 | 261,903 | 259,554
Cumulative preferred stock—not subject to mandatory redemption | 5,000 | 5,000 |  |
Long-term debt, net | 200,860 | 190,836 |  |
Total capitalization | 478,658 | 466,101 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 8,997 | 8,993 |  |
Short-term borrowings from non-affiliates | 0 | 0 |  |
Short-term borrowings from affiliate | 5,600 | 0 |  |
Accounts payable | 20,548 | 20,427 |  |
Interest and preferred dividends payable | 2,752 | 2,735 |  |
Taxes accrued, including revenue taxes | 25,711 | 30,312 |  |
Regulatory liabilities | 4,537 | 1,549 |  |
Other | 13,963 | 14,197 |  |
Total current liabilities | 82,108 | 78,213 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 56,771 | 55,863 |  |
Regulatory liabilities | 94,755 | 94,901 |  |
Unamortized tax credits | 15,442 | 15,163 |  |
Defined benefit pension and other postretirement benefit plans liability | 63,422 | 65,518 |  |
Other | 17,589 | 17,675 |  |
Total deferred credits and other liabilities | 247,979 | 249,120 |  |
Total liabilities and shareholders’ equity | 808,745 | 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, including revenue taxes | 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 | 52,914 | 53,177 |  |
Plant and equipment | 6,652,982 | 6,401,040 |  |
Less accumulated depreciation | (2,534,428) | (2,476,352) |  |
Construction in progress | 165,608 | 263,094 |  |
Utility property, plant and equipment, net | 4,337,076 | 4,240,959 |  |
Nonutility property, plant and equipment, less accumulated depreciation | 7,581 | 7,580 |  |
Total property, plant and equipment, net | 4,344,657 | 4,248,539 |  |
Investment in wholly owned subsidiaries, at equity | 0 | 0 |  |
Current assets |  |  |  |
Cash and cash equivalents | 20,860 | 12,517 | 42,582 | 74,286
Advances to affiliates | 0 | 0 |  |
Customer accounts receivable, net | 157,260 | 127,889 |  |
Accrued unbilled revenues, net | 110,839 | 107,054 |  |
Other accounts receivable, net | 6,896 | 7,163 |  |
Fuel oil stock, at average cost | 107,016 | 86,873 |  |
Materials and supplies, at average cost | 57,941 | 54,397 |  |
Prepayments and other | 29,240 | 25,355 |  |
Regulatory assets | 103,566 | 88,390 |  |
Total current assets | 593,618 | 509,638 |  |
Other long-term assets |  |  |  |
Regulatory assets | 756,844 | 780,907 |  |
Other | 108,595 | 91,529 |  |
Total other long-term assets | 865,439 | 872,436 |  |
Total assets | 5,803,714 | 5,630,613 |  |
Capitalization |  |  |  |
Common stock equity | 1,852,324 | 1,845,283 | $ 1,803,506 | $ 1,799,787
Cumulative preferred stock—not subject to mandatory redemption | 34,293 | 34,293 |  |
Long-term debt, net | 1,418,474 | 1,318,516 |  |
Total capitalization | 3,305,091 | 3,198,092 |  |
Current liabilities |  |  |  |
Current portion of long-term debt | 49,983 | 49,963 |  |
Short-term borrowings from non-affiliates | 91,880 | 4,999 |  |
Short-term borrowings from affiliate | 0 | 0 |  |
Accounts payable | 153,759 | 159,610 |  |
Interest and preferred dividends payable | 22,684 | 22,575 |  |
Taxes accrued, including revenue taxes | 172,063 | 199,101 |  |
Regulatory liabilities | 9,787 | 3,401 |  |
Other | 59,203 | 59,456 |  |
Total current liabilities | 559,359 | 499,105 |  |
Deferred credits and other liabilities |  |  |  |
Deferred income taxes | 388,875 | 394,041 |  |
Regulatory liabilities | 895,429 | 877,369 |  |
Unamortized tax credits | 92,798 | 90,369 |  |
Defined benefit pension and other postretirement benefit plans liability | 457,953 | 472,948 |  |
Other | 104,209 | 98,689 |  |
Total deferred credits and other liabilities | 1,939,264 | 1,933,416 |  |
Total liabilities and shareholders’ equity | $ 5,803,714 | $ 5,630,613 |  |

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