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Electric utility segment - Consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Operating expenses |  |  |  |
Purchased power | $ 139,000 | $ 149,000 | $ 255,000 | $ 285,000
Total expenses | 480,789 | 551,182 | 962,898 | 1,119,538
Total operating income | 85,455 | 72,730 | 154,306 | 142,236
Other income |  |  |  |
Allowance for equity funds used during construction | 1,997 | 1,896 | 3,736 | 3,309
Interest and other charges |  |  |  |
Allowance for borrowed funds used during construction | 760 | 682 | 1,422 | 1,181
Income taxes | 26,310 | 20,911 | 44,611 | 40,890
Net income | 44,601 | 35,491 | 77,426 | 67,830
Preferred stock dividends of subsidiaries | 473 | 473 | 946 | 946
Net income for common stock | 44,128 | 35,018 | 76,480 | 66,884
Hawaiian Electric Company |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 347,010 | 391,007 | 684,185 | 790,748
Operating expenses |  |  |  |
Fuel oil | 62,234 | 104,278 | 136,319 | 222,681
Purchased power | 103,062 | 107,370 | 194,979 | 210,620
Other operation and maintenance | 68,197 | 66,428 | 137,755 | 136,512
Depreciation | 31,522 | 29,389 | 63,044 | 58,778
Taxes, other than income taxes | 33,414 | 37,479 | 66,098 | 75,680
Total expenses | 298,429 | 344,944 | 598,195 | 704,271
Total operating income | 48,581 | 46,063 | 85,990 | 86,477
Other income |  |  |  |
Allowance for equity funds used during construction | 1,559 | 1,581 | 2,965 | 2,704
Equity in earnings of subsidiaries | 10,883 | 9,624 | 18,812 | 17,316
Interest and other charges |  |  |  |
Interest expense and other charges, net | (10,345) | (11,290) | (22,210) | (22,528)
Allowance for borrowed funds used during construction | 587 | 564 | 1,116 | 952
Income before income taxes | 51,265 | 46,542 | 86,673 | 84,921
Income taxes | 15,138 | 13,431 | 24,909 | 24,666
Net income | 36,127 | 33,111 | 61,764 | 60,255
Net income attributable to Hawaiian Electric | 36,127 | 33,111 | 61,764 | 60,255
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | 35,857 | 32,841 | 61,224 | 59,715
HELCO |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 73,652 | 83,732 | 146,835 | 171,787
Operating expenses |  |  |  |
Fuel oil | 11,748 | 16,241 | 26,122 | 39,626
Purchased power | 19,360 | 24,555 | 36,157 | 46,448
Other operation and maintenance | 15,116 | 16,158 | 31,557 | 32,557
Depreciation | 9,449 | 9,312 | 18,898 | 18,625
Taxes, other than income taxes | 6,905 | 7,944 | 13,796 | 16,328
Total expenses | 62,578 | 74,210 | 126,530 | 153,584
Total operating income | 11,074 | 9,522 | 20,305 | 18,203
Other income |  |  |  |
Allowance for equity funds used during construction | 206 | 165 | 333 | 310
Interest and other charges |  |  |  |
Interest expense and other charges, net | (2,669) | (2,592) | (5,634) | (5,272)
Allowance for borrowed funds used during construction | 79 | 58 | 128 | 111
Income before income taxes | 8,690 | 7,153 | 15,132 | 13,352
Income taxes | 3,337 | 2,536 | 5,683 | 4,813
Net income | 5,353 | 4,617 | 9,449 | 8,539
Preferred stock dividends of subsidiaries | 133 | 133 | 267 | 267
Net income attributable to Hawaiian Electric | 5,220 | 4,484 | 9,182 | 8,272
Net income for common stock | 5,220 | 4,484 | 9,182 | 8,272
Maui Electric |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 74,758 | 83,442 | 146,464 | 169,116
Operating expenses |  |  |  |
Fuel oil | 17,917 | 25,712 | 43,198 | 60,730
Purchased power | 16,636 | 17,359 | 23,781 | 28,223
Other operation and maintenance | 16,250 | 16,278 | 34,159 | 33,797
Depreciation | 5,789 | 5,540 | 11,599 | 11,081
Taxes, other than income taxes | 7,110 | 7,959 | 13,973 | 16,122
Total expenses | 63,702 | 72,848 | 126,710 | 149,953
Total operating income | 11,056 | 10,594 | 19,754 | 19,163
Other income |  |  |  |
Allowance for equity funds used during construction | 232 | 150 | 438 | 295
Interest and other charges |  |  |  |
Interest expense and other charges, net | (2,114) | (2,424) | (4,604) | (4,859)
Allowance for borrowed funds used during construction | 94 | 60 | 178 | 118
Income before income taxes | 9,268 | 8,380 | 15,766 | 14,717
Income taxes | 3,509 | 3,144 | 5,945 | 5,482
Net income | 5,759 | 5,236 | 9,821 | 9,235
Preferred stock dividends of subsidiaries | 96 | 96 | 191 | 191
Net income attributable to Hawaiian Electric | 5,663 | 5,140 | 9,630 | 9,044
Net income for common stock | 5,663 | 5,140 | 9,630 | 9,044
Other subsidiaries |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Other operation and maintenance | 0 | 0 | 0 | 0
Total expenses | 0 | 0 | 0 | 0
Total operating income | 0 | 0 | 0 | 0
Interest and other charges |  |  |  |
Income before income taxes | 0 | 0 | 0 | 0
Income taxes | 0 | 0 | 0 | 0
Net income | 0 | 0 | 0 | 0
Net income attributable to Hawaiian Electric | 0 | 0 | 0 | 0
Net income for common stock | 0 | 0 | 0 | 0
Consolidating adjustments |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | (25) | (18) | (37) | (46)
Operating expenses |  |  |  |
Total operating income | (25) | (18) | (37) | (46)
Other income |  |  |  |
Equity in earnings of subsidiaries | (10,883) | (9,624) | (18,812) | (17,316)
Interest and other charges |  |  |  |
Interest expense and other charges, net | 25 | 18 | 37 | 46
Income before income taxes | (10,883) | (9,624) | (18,812) | (17,316)
Income taxes | 0 | 0 | 0 | 0
Net income | (10,883) | (9,624) | (18,812) | (17,316)
Net income attributable to Hawaiian Electric | (10,883) | (9,624) | (18,812) | (17,316)
Net income for common stock | (10,883) | (9,624) | (18,812) | (17,316)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Revenues | 495,395 | 558,163 | 977,447 | 1,131,605
Operating expenses |  |  |  |
Fuel oil | 91,899 | 146,231 | 205,639 | 323,037
Purchased power | 139,058 | 149,284 | 254,917 | 285,291
Other operation and maintenance | 99,563 | 98,864 | 203,471 | 202,866
Depreciation | 46,760 | 44,241 | 93,541 | 88,484
Taxes, other than income taxes | 47,429 | 53,382 | 93,867 | 108,130
Total expenses | 424,709 | 492,002 | 851,435 | 1,007,808
Total operating income | 70,686 | 66,161 | 126,012 | 123,797
Other income |  |  |  |
Allowance for equity funds used during construction | 1,997 | 1,896 | 3,736 | 3,309
Interest and other charges |  |  |  |
Interest expense and other charges, net | (15,103) | (16,288) | (32,411) | (32,613)
Allowance for borrowed funds used during construction | 760 | 682 | 1,422 | 1,181
Income before income taxes | 58,340 | 52,451 | 98,759 | 95,674
Income taxes | 21,984 | 19,111 | 36,537 | 34,961
Net income | 36,356 | 33,340 | 62,222 | 60,713
Preferred stock dividends of subsidiaries | 229 | 229 | 458 | 458
Net income attributable to Hawaiian Electric | 36,127 | 33,111 | 61,764 | 60,255
Preferred stock dividends of Hawaiian Electric | 270 | 270 | 540 | 540
Net income for common stock | $ 35,857 | $ 32,841 | $ 61,224 | $ 59,715

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