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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | $ 768,048 | $ 673,185 | $ 2,099,199 | $ 1,897,028
Expenses |  |  |  |
Purchased power | 177,000 | 161,000 | 478,000 | 441,000
Total expenses | 669,984 | 561,712 | 1,850,447 | 1,638,015
Total operating income | 98,064 | 111,473 | 248,752 | 259,013
Allowance for equity funds used during construction | 1,962 | 3,482 | 8,239 | 8,908
Retirement defined benefits expense—other than service costs | (1,276) | (1,928) | (4,673) | (5,710)
Allowance for borrowed funds used during construction | 1,006 | 1,339 | 3,815 | 3,371
Income before income taxes | 77,233 | 95,139 | 190,091 | 206,347
Income taxes | 10,862 | 34,595 | 36,473 | 72,003
Net income | 66,371 | 60,544 | 153,618 | 134,344
Preferred stock dividends of subsidiaries | 471 | 471 | 1,417 | 1,417
Net income for common stock | 65,900 | 60,073 | 152,201 | 132,927
Consolidating adjustments |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | (55) | (30) | (156) | (51)
Expenses |  |  |  |
Fuel oil | 0 | 0 | 0 | 0
Purchased power | 0 | 0 | 0 | 0
Other operation and maintenance | 0 | 0 | 0 | 0
Depreciation | 0 | 0 | 0 | 0
Taxes, other than income taxes | 0 | 0 | 0 | 0
Total expenses | 0 | 0 | 0 | 0
Total operating income | (55) | (30) | (156) | (51)
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries | (16,636) | (12,767) | (35,041) | (29,306)
Retirement defined benefits expense—other than service costs | 0 | 0 | 0 | 0
Interest expense and other charges, net | 55 | 30 | 156 | 51
Allowance for borrowed funds used during construction | 0 | 0 | 0 | 0
Income before income taxes | (16,636) | (12,767) | (35,041) | (29,306)
Income taxes | 0 | 0 | 0 | 0
Net income | (16,636) | (12,767) | (35,041) | (29,306)
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | (16,636) | (12,767) | (35,041) | (29,306)
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | (16,636) | (12,767) | (35,041) | (29,306)
Hawaiian Electric (parent only) |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 64,996 |  | 200,648
Total expenses |  | 366,394 |  | 1,054,570
Total operating income |  | 62,873 |  | 131,954
Retirement defined benefits expense—other than service costs |  | (1,225) |  | (3,812)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 488,210 | 429,267 | 1,321,089 | 1,186,524
Expenses |  |  |  |
Fuel oil | 141,357 | 103,959 | 375,862 | 301,774
Purchased power | 138,135 | 123,893 | 367,317 | 340,498
Other operation and maintenance | 78,988 | 64,996 | 228,773 | 200,648
Depreciation | 34,282 | 32,722 | 103,112 | 98,167
Taxes, other than income taxes | 46,096 | 40,824 | 125,214 | 113,483
Total expenses | 438,858 | 366,394 | 1,200,278 | 1,054,570
Total operating income | 49,352 | 62,873 | 120,811 | 131,954
Allowance for equity funds used during construction | 1,648 | 3,108 | 7,123 | 7,823
Equity in earnings of subsidiaries | 16,636 | 12,767 | 35,041 | 29,306
Retirement defined benefits expense—other than service costs | (475) | (1,225) | (2,091) | (3,812)
Interest expense and other charges, net | (13,542) | (11,786) | (38,967) | (36,405)
Allowance for borrowed funds used during construction | 810 | 1,173 | 3,198 | 2,910
Income before income taxes | 54,429 | 66,910 | 125,115 | 131,776
Income taxes | 4,447 | 19,153 | 15,949 | 36,370
Net income | 49,982 | 47,757 | 109,166 | 95,406
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | 49,982 | 47,757 | 109,166 | 95,406
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 810 | 810
Net income for common stock | 49,712 | 47,487 | 108,356 | 94,596
HELCO |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 16,608 |  | 49,850
Total expenses |  | 71,307 |  | 212,875
Total operating income |  | 13,027 |  | 32,151
Retirement defined benefits expense—other than service costs |  | 15 |  | 183
HELCO | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 98,981 | 84,334 | 276,462 | 245,026
Expenses |  |  |  |
Fuel oil | 26,429 | 15,754 | 64,348 | 47,486
Purchased power | 24,091 | 21,332 | 72,589 | 63,403
Other operation and maintenance | 15,253 | 16,608 | 50,366 | 49,850
Depreciation | 10,072 | 9,685 | 30,165 | 29,056
Taxes, other than income taxes | 9,215 | 7,928 | 25,835 | 23,080
Total expenses | 85,060 | 71,307 | 243,303 | 212,875
Total operating income | 13,921 | 13,027 | 33,159 | 32,151
Allowance for equity funds used during construction | 39 | 167 | 274 | 416
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Retirement defined benefits expense—other than service costs | (104) | 15 | (312) | 183
Interest expense and other charges, net | (3,026) | (2,899) | (8,855) | (8,899)
Allowance for borrowed funds used during construction | 49 | 72 | 190 | 172
Income before income taxes | 10,879 | 10,382 | 24,456 | 24,023
Income taxes | 1,571 | 3,815 | 5,017 | 8,973
Net income | 9,308 | 6,567 | 19,439 | 15,050
Preferred stock dividends of subsidiaries | 133 | 133 | 400 | 400
Net income attributable to Hawaiian Electric | 9,175 | 6,434 | 19,039 | 14,650
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 9,175 | 6,434 | 19,039 | 14,650
Maui Electric |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 17,077 |  | 51,939
Total expenses |  | 72,571 |  | 211,470
Total operating income |  | 12,627 |  | 31,286
Retirement defined benefits expense—other than service costs |  | (211) |  | (650)
Maui Electric | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 100,273 | 85,198 | 268,567 | 242,756
Expenses |  |  |  |
Fuel oil | 38,765 | 26,545 | 105,026 | 82,527
Purchased power | 15,364 | 15,122 | 38,332 | 36,637
Other operation and maintenance | 19,312 | 17,077 | 54,666 | 51,939
Depreciation | 6,629 | 5,799 | 18,533 | 17,355
Taxes, other than income taxes | 9,385 | 8,028 | 25,275 | 23,012
Total expenses | 89,455 | 72,571 | 241,832 | 211,470
Total operating income | 10,818 | 12,627 | 26,735 | 31,286
Allowance for equity funds used during construction | 275 | 207 | 842 | 669
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Retirement defined benefits expense—other than service costs | (103) | (211) | (531) | (650)
Interest expense and other charges, net | (2,455) | (2,252) | (7,156) | (7,372)
Allowance for borrowed funds used during construction | 147 | 94 | 427 | 289
Income before income taxes | 8,682 | 10,465 | 20,317 | 24,222
Income taxes | 1,126 | 4,037 | 4,029 | 9,280
Net income | 7,556 | 6,428 | 16,288 | 14,942
Preferred stock dividends of subsidiaries | 95 | 95 | 286 | 286
Net income attributable to Hawaiian Electric | 7,461 | 6,333 | 16,002 | 14,656
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 7,461 | 6,333 | 16,002 | 14,656
Other subsidiaries | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Expenses |  |  |  |
Fuel oil | 0 | 0 | 0 | 0
Purchased power | 0 | 0 | 0 | 0
Other operation and maintenance | 0 | 0 | 0 | 0
Depreciation | 0 | 0 | 0 | 0
Taxes, other than income taxes | 0 | 0 | 0 | 0
Total expenses | 0 | 0 | 0 | 0
Total operating income | 0 | 0 | 0 | 0
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Retirement defined benefits expense—other than service costs | 0 | 0 | 0 | 0
Interest expense and other charges, net | 0 | 0 | 0 | 0
Allowance for borrowed funds used during construction | 0 | 0 | 0 | 0
Income before income taxes | 0 | 0 | 0 | 0
Income taxes | 0 | 0 | 0 | 0
Net income | 0 | 0 | 0 | 0
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | 0 | 0 | 0 | 0
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 0 | 0 | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 687,409 | 598,769 | 1,865,962 | 1,674,255
Expenses |  |  |  |
Fuel oil | 206,551 | 146,258 | 545,236 | 431,787
Purchased power | 177,590 | 160,347 | 478,238 | 440,538
Other operation and maintenance | 113,553 | 98,681 | 333,805 | 302,437
Depreciation | 50,983 | 48,206 | 151,810 | 144,578
Taxes, other than income taxes | 64,696 | 56,780 | 176,324 | 159,575
Total expenses | 613,373 | 510,272 | 1,685,413 | 1,478,915
Total operating income | 74,036 | 88,497 | 180,549 | 195,340
Allowance for equity funds used during construction | 1,962 | 3,482 | 8,239 | 8,908
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Retirement defined benefits expense—other than service costs | (682) | (1,421) | (2,934) | (4,279)
Interest expense and other charges, net | (18,968) | (16,907) | (54,822) | (52,625)
Allowance for borrowed funds used during construction | 1,006 | 1,339 | 3,815 | 3,371
Income before income taxes | 57,354 | 74,990 | 134,847 | 150,715
Income taxes | 7,144 | 27,005 | 24,995 | 54,623
Net income | 50,210 | 47,985 | 109,852 | 96,092
Preferred stock dividends of subsidiaries | 228 | 228 | 686 | 686
Net income attributable to Hawaiian Electric | 49,982 | 47,757 | 109,166 | 95,406
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 810 | 810
Net income for common stock | $ 49,712 | $ 47,487 | $ 108,356 | $ 94,596

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