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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | $ 685,277 | $ 632,281 | $ 1,331,151 | $ 1,223,843
Expenses |  |  |  |
Purchased power | 161,000 | 153,000 | 301,000 | 280,000
Total expenses | 606,478 | 554,479 | 1,180,463 | 1,076,303
Total operating income | 78,799 | 77,802 | 150,688 | 147,540
Allowance for equity funds used during construction | 2,983 | 3,027 | 6,277 | 5,426
Less: Retirement defined benefits expense—other than service costs | (1,564) | (1,906) | (3,397) | (3,782)
Allowance for borrowed funds used during construction | 1,365 | 1,143 | 2,809 | 2,032
Income before income taxes | 59,582 | 59,626 | 112,858 | 111,208
Income taxes | 13,055 | 20,492 | 25,611 | 37,408
Net income | 46,527 | 39,134 | 87,247 | 73,800
Preferred stock dividends of subsidiaries | 473 | 473 | 946 | 946
Net income for common stock | 46,054 | 38,661 | 86,301 | 72,854
Consolidating adjustments |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | (59) | (14) | (101) | (21)
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 | (59) | (14) | (101) | (21)
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries | (9,080) | (7,936) | (18,405) | (16,539)
Less: Retirement defined benefits expense—other than service costs | 0 | 0 | 0 | 0
Interest expense and other charges, net | 59 | 14 | 101 | 21
Allowance for borrowed funds used during construction | 0 | 0 | 0 | 0
Income before income taxes | (9,080) | (7,936) | (18,405) | (16,539)
Income taxes | 0 | 0 | 0 | 0
Net income | (9,080) | (7,936) | (18,405) | (16,539)
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | (9,080) | (7,936) | (18,405) | (16,539)
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | (9,080) | (7,936) | (18,405) | (16,539)
Hawaiian Electric (parent only) |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 69,659 |  | 135,652
Total expenses |  | 356,273 |  | 688,176
Total operating income |  | 38,141 |  | 69,081
Less: Retirement defined benefits expense—other than service costs |  | (1,302) |  | (2,587)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 431,699 | 394,414 | 832,879 | 757,257
Expenses |  |  |  |
Fuel oil | 120,007 | 99,814 | 234,505 | 197,815
Purchased power | 121,812 | 116,458 | 229,182 | 216,605
Other operation and maintenance | 76,845 | 69,659 | 149,785 | 135,652
Depreciation | 34,391 | 32,723 | 68,830 | 65,445
Taxes, other than income taxes | 40,951 | 37,619 | 79,118 | 72,659
Total expenses | 394,006 | 356,273 | 761,420 | 688,176
Total operating income | 37,693 | 38,141 | 71,459 | 69,081
Allowance for equity funds used during construction | 2,588 | 2,659 | 5,475 | 4,715
Equity in earnings of subsidiaries | 9,080 | 7,936 | 18,405 | 16,539
Less: Retirement defined benefits expense—other than service costs | (554) | (1,302) | (1,616) | (2,587)
Interest expense and other charges, net | (12,930) | (12,562) | (25,425) | (24,619)
Allowance for borrowed funds used during construction | 1,150 | 988 | 2,388 | 1,737
Income before income taxes | 37,027 | 35,860 | 70,686 | 64,866
Income taxes | 5,588 | 9,946 | 11,502 | 17,217
Net income | 31,439 | 25,914 | 59,184 | 47,649
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | 31,439 | 25,914 | 59,184 | 47,649
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | 31,169 | 25,644 | 58,644 | 47,109
HELCO |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 17,643 |  | 33,242
Total expenses |  | 72,988 |  | 141,568
Total operating income |  | 8,722 |  | 19,124
Less: Retirement defined benefits expense—other than service costs |  | 85 |  | 168
HELCO | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 89,548 | 81,710 | 177,481 | 160,692
Expenses |  |  |  |
Fuel oil | 19,432 | 14,475 | 37,919 | 31,732
Purchased power | 24,664 | 23,482 | 48,498 | 42,071
Other operation and maintenance | 19,015 | 17,643 | 35,113 | 33,242
Depreciation | 10,038 | 9,686 | 20,093 | 19,371
Taxes, other than income taxes | 8,408 | 7,702 | 16,620 | 15,152
Total expenses | 81,557 | 72,988 | 158,243 | 141,568
Total operating income | 7,991 | 8,722 | 19,238 | 19,124
Allowance for equity funds used during construction | 124 | 134 | 235 | 249
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Less: Retirement defined benefits expense—other than service costs | (105) | 85 | (208) | 168
Interest expense and other charges, net | (2,922) | (2,996) | (5,829) | (6,000)
Allowance for borrowed funds used during construction | 77 | 55 | 141 | 100
Income before income taxes | 5,165 | 6,000 | 13,577 | 13,641
Income taxes | 1,269 | 2,235 | 3,446 | 5,158
Net income | 3,896 | 3,765 | 10,131 | 8,483
Preferred stock dividends of subsidiaries | 133 | 133 | 267 | 267
Net income attributable to Hawaiian Electric | 3,763 | 3,632 | 9,864 | 8,216
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 3,763 | 3,632 | 9,864 | 8,216
Maui Electric |  |  |  |
Expenses |  |  |  |
Other operation and maintenance |  | 17,637 |  | 34,862
Total expenses |  | 71,132 |  | 138,899
Total operating income |  | 9,633 |  | 18,659
Less: Retirement defined benefits expense—other than service costs |  | (218) |  | (439)
Maui Electric | Reportable Legal Entities |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 86,938 | 80,765 | 168,294 | 157,558
Expenses |  |  |  |
Fuel oil | 32,278 | 26,970 | 66,261 | 55,982
Purchased power | 14,262 | 13,127 | 22,968 | 21,515
Other operation and maintenance | 16,782 | 17,637 | 35,354 | 34,862
Depreciation | 5,932 | 5,747 | 11,904 | 11,556
Taxes, other than income taxes | 8,165 | 7,651 | 15,890 | 14,984
Total expenses | 77,419 | 71,132 | 152,377 | 138,899
Total operating income | 9,519 | 9,633 | 15,917 | 18,659
Allowance for equity funds used during construction | 271 | 234 | 567 | 462
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Less: Retirement defined benefits expense—other than service costs | (329) | (218) | (428) | (439)
Interest expense and other charges, net | (2,367) | (2,670) | (4,701) | (5,120)
Allowance for borrowed funds used during construction | 138 | 100 | 280 | 195
Income before income taxes | 7,232 | 7,079 | 11,635 | 13,757
Income taxes | 1,819 | 2,679 | 2,903 | 5,243
Net income | 5,413 | 4,400 | 8,732 | 8,514
Preferred stock dividends of subsidiaries | 96 | 96 | 191 | 191
Net income attributable to Hawaiian Electric | 5,317 | 4,304 | 8,541 | 8,323
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 5,317 | 4,304 | 8,541 | 8,323
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
Less: 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 | 608,126 | 556,875 | 1,178,553 | 1,075,486
Expenses |  |  |  |
Fuel oil | 171,717 | 141,259 | 338,685 | 285,529
Purchased power | 160,738 | 153,067 | 300,648 | 280,191
Other operation and maintenance | 112,642 | 104,939 | 220,252 | 203,756
Depreciation | 50,361 | 48,156 | 100,827 | 96,372
Taxes, other than income taxes | 57,524 | 52,972 | 111,628 | 102,795
Total expenses | 552,982 | 500,393 | 1,072,040 | 968,643
Total operating income | 55,144 | 56,482 | 106,513 | 106,843
Allowance for equity funds used during construction | 2,983 | 3,027 | 6,277 | 5,426
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Less: Retirement defined benefits expense—other than service costs | (988) | (1,435) | (2,252) | (2,858)
Interest expense and other charges, net | (18,160) | (18,214) | (35,854) | (35,718)
Allowance for borrowed funds used during construction | 1,365 | 1,143 | 2,809 | 2,032
Income before income taxes | 40,344 | 41,003 | 77,493 | 75,725
Income taxes | 8,676 | 14,860 | 17,851 | 27,618
Net income | 31,668 | 26,143 | 59,642 | 48,107
Preferred stock dividends of subsidiaries | 229 | 229 | 458 | 458
Net income attributable to Hawaiian Electric | 31,439 | 25,914 | 59,184 | 47,649
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | $ 31,169 | $ 25,644 | $ 58,644 | $ 47,109

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