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Consolidated Statements of Income - HECO - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues $ 624,032 $ 717,176 $ 623,912 $ 637,862 $ 790,040 $ 867,096 $ 798,657 $ 783,749 $ 2,602,982 $ 3,239,542 $ 3,238,470
Expenses                      
Total expenses                 2,280,429 2,906,942 2,920,962
Operating income 83,222 97,095 72,730 69,506 68,167 92,036 83,183 89,214 322,553 332,600 317,508
Allowance for equity funds used during construction                 6,928 6,771 5,561
Allowance for borrowed funds used during construction                 2,457 2,579 2,246
Income before income taxes                 254,788 265,598 249,836
Income taxes                 93,021 95,579 86,237
Net income (loss) 42,793 51,144 35,491 32,339 33,726 48,279 41,754 46,260 161,767 170,019 163,599
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890
Net income for common stock 42,320 50,673 35,018 31,866 33,253 47,808 41,281 45,787 159,877 168,129 161,709
Hawaiian Electric Company, Inc. and Subsidiaries                      
Revenues 555,434 648,127 558,163 573,442 725,267 803,565 738,429 720,062 2,335,166 2,987,323 2,980,172
Expenses                      
Fuel oil                 654,600 1,131,685 1,185,552
Purchased power                 594,096 722,008 710,681
Other operation and maintenance                 413,089 410,612 403,270
Depreciation                 177,380 166,387 154,025
Taxes, other than income taxes                 221,885 280,863 281,131
Total expenses                 2,061,050 2,711,555 2,734,659
Operating income 67,662 82,657 66,161 57,636 58,878 76,156 70,068 70,666 274,116 275,768 245,513
Allowance for equity funds used during construction                 6,928 6,771 5,561
Interest expense and other charges, net                 (66,370) (64,757) (59,279)
Allowance for borrowed funds used during construction                 2,457 2,579 2,246
Income before income taxes                 217,131 220,361 194,041
Income taxes                 79,422 80,725 69,117
Net income (loss) 33,492 43,504 33,340 27,373 29,611 39,377 34,729 35,919 137,709 139,636 124,924
Preferred stock dividends of subsidiaries                 915 915 915
Net income attributable to Hawaiian Electric                 136,794 138,721 124,009
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock $ 32,993 $ 43,006 $ 32,841 $ 26,874 $ 29,112 $ 38,879 $ 34,230 $ 35,420 $ 135,714 $ 137,641 $ 122,929