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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | $ 632,281 | $ 566,244 | $ 1,223,843 | $ 1,117,204
Expenses |  |  |  |
Purchased power | 153,000 | 139,000 | 280,000 | 255,000
Total expenses | 556,385 | 480,789 | 1,080,085 | 962,898
Total operating income | 75,896 | 85,455 | 143,758 | 154,306
Allowance for equity funds used during construction | 3,027 | 1,997 | 5,426 | 3,736
Allowance for borrowed funds used during construction | 1,143 | 760 | 2,032 | 1,422
Income before income taxes | 59,626 | 70,911 | 111,208 | 122,037
Income taxes | 20,492 | 26,310 | 37,408 | 44,611
Net income | 39,134 | 44,601 | 73,800 | 77,426
Preferred stock dividends of subsidiaries | 473 | 473 | 946 | 946
Net income for common stock | 38,661 | 44,128 | 72,854 | 76,480
Hawaiian Electric Company |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 394,414 | 347,010 | 757,257 | 684,185
Expenses |  |  |  |
Fuel oil | 99,814 | 62,234 | 197,815 | 136,319
Purchased power | 116,458 | 103,062 | 216,605 | 194,979
Other operation and maintenance | 70,961 | 68,197 | 138,239 | 137,755
Depreciation | 32,723 | 31,522 | 65,445 | 63,044
Taxes, other than income taxes | 37,619 | 33,414 | 72,659 | 66,098
Total expenses | 357,575 | 298,429 | 690,763 | 598,195
Total operating income | 36,839 | 48,581 | 66,494 | 85,990
Allowance for equity funds used during construction | 2,659 | 1,559 | 4,715 | 2,965
Equity in earnings of subsidiaries | 7,936 | 10,883 | 16,539 | 18,812
Interest expense and other charges, net | (12,562) | (10,345) | (24,619) | (22,210)
Allowance for borrowed funds used during construction | 988 | 587 | 1,737 | 1,116
Income before income taxes | 35,860 | 51,265 | 64,866 | 86,673
Income taxes | 9,946 | 15,138 | 17,217 | 24,909
Net income | 25,914 | 36,127 | 47,649 | 61,764
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | 25,914 | 36,127 | 47,649 | 61,764
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | 25,644 | 35,857 | 47,109 | 61,224
HELCO |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 81,710 | 73,652 | 160,692 | 146,835
Expenses |  |  |  |
Fuel oil | 14,475 | 11,748 | 31,732 | 26,122
Purchased power | 23,482 | 19,360 | 42,071 | 36,157
Other operation and maintenance | 17,558 | 15,116 | 33,074 | 31,557
Depreciation | 9,686 | 9,449 | 19,371 | 18,898
Taxes, other than income taxes | 7,702 | 6,905 | 15,152 | 13,796
Total expenses | 72,903 | 62,578 | 141,400 | 126,530
Total operating income | 8,807 | 11,074 | 19,292 | 20,305
Allowance for equity funds used during construction | 134 | 206 | 249 | 333
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Interest expense and other charges, net | (2,996) | (2,669) | (6,000) | (5,634)
Allowance for borrowed funds used during construction | 55 | 79 | 100 | 128
Income before income taxes | 6,000 | 8,690 | 13,641 | 15,132
Income taxes | 2,235 | 3,337 | 5,158 | 5,683
Net income | 3,765 | 5,353 | 8,483 | 9,449
Preferred stock dividends of subsidiaries | 133 | 133 | 267 | 267
Net income attributable to Hawaiian Electric | 3,632 | 5,220 | 8,216 | 9,182
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 3,632 | 5,220 | 8,216 | 9,182
Maui Electric |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 80,765 | 74,758 | 157,558 | 146,464
Expenses |  |  |  |
Fuel oil | 26,970 | 17,917 | 55,982 | 43,198
Purchased power | 13,127 | 16,636 | 21,515 | 23,781
Other operation and maintenance | 17,855 | 16,250 | 35,301 | 34,159
Depreciation | 5,747 | 5,789 | 11,556 | 11,599
Taxes, other than income taxes | 7,651 | 7,110 | 14,984 | 13,973
Total expenses | 71,350 | 63,702 | 139,338 | 126,710
Total operating income | 9,415 | 11,056 | 18,220 | 19,754
Allowance for equity funds used during construction | 234 | 232 | 462 | 438
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Interest expense and other charges, net | (2,670) | (2,114) | (5,120) | (4,604)
Allowance for borrowed funds used during construction | 100 | 94 | 195 | 178
Income before income taxes | 7,079 | 9,268 | 13,757 | 15,766
Income taxes | 2,679 | 3,509 | 5,243 | 5,945
Net income | 4,400 | 5,759 | 8,514 | 9,821
Preferred stock dividends of subsidiaries | 96 | 96 | 191 | 191
Net income attributable to Hawaiian Electric | 4,304 | 5,663 | 8,323 | 9,630
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 4,304 | 5,663 | 8,323 | 9,630
Other subsidiaries |  |  |  |
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
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
Consolidating adjustments |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | (14) | (25) | (21) | (37)
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 | (14) | (25) | (21) | (37)
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Equity in earnings of subsidiaries | (7,936) | (10,883) | (16,539) | (18,812)
Interest expense and other charges, net | 14 | 25 | 21 | 37
Allowance for borrowed funds used during construction | 0 | 0 | 0 | 0
Income before income taxes | (7,936) | (10,883) | (16,539) | (18,812)
Income taxes | 0 | 0 | 0 | 0
Net income | (7,936) | (10,883) | (16,539) | (18,812)
Preferred stock dividends of subsidiaries | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | (7,936) | (10,883) | (16,539) | (18,812)
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | (7,936) | (10,883) | (16,539) | (18,812)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 556,875 | 495,395 | 1,075,486 | 977,447
Expenses |  |  |  |
Fuel oil | 141,259 | 91,899 | 285,529 | 205,639
Purchased power | 153,067 | 139,058 | 280,191 | 254,917
Other operation and maintenance | 106,374 | 99,563 | 206,614 | 203,471
Depreciation | 48,156 | 46,760 | 96,372 | 93,541
Taxes, other than income taxes | 52,972 | 47,429 | 102,795 | 93,867
Total expenses | 501,828 | 424,709 | 971,501 | 851,435
Total operating income | 55,047 | 70,686 | 103,985 | 126,012
Allowance for equity funds used during construction | 3,027 | 1,997 | 5,426 | 3,736
Equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Interest expense and other charges, net | (18,214) | (15,103) | (35,718) | (32,411)
Allowance for borrowed funds used during construction | 1,143 | 760 | 2,032 | 1,422
Income before income taxes | 41,003 | 58,340 | 75,725 | 98,759
Income taxes | 14,860 | 21,984 | 27,618 | 36,537
Net income | 26,143 | 36,356 | 48,107 | 62,222
Preferred stock dividends of subsidiaries | 229 | 229 | 458 | 458
Net income attributable to Hawaiian Electric | 25,914 | 36,127 | 47,649 | 61,764
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | $ 25,644 | $ 35,857 | $ 47,109 | $ 61,224

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