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Consolidated Statements of Income - HECO - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 658,597 $ 673,185 $ 632,281 $ 591,562 $ 617,395 $ 646,055 $ 566,244 $ 550,960 $ 2,555,625 $ 2,380,654 $ 2,602,982
Expenses                      
Purchased power                 587,000 563,000 594,000
Total expenses                 2,217,334 2,032,479 2,280,429
Operating income 84,988 109,545 75,896 67,862 88,427 105,442 85,455 68,851 338,291 348,175 322,553
Allowance for equity funds used during construction                 12,483 8,325 6,928
Allowance for borrowed funds used during construction                 4,778 3,144 2,457
Income before income taxes                 276,580 373,841 254,788
Income taxes                 109,393 123,695 93,021
Net income (loss) 32,843 60,544 39,134 34,666 45,107 127,613 44,601 32,825 167,187 250,146 161,767
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890
Net income for common stock 32,370 60,073 38,661 34,193 44,634 127,142 44,128 32,352 165,297 248,256 159,877
Hawaiian Electric Company, Inc. and Subsidiaries                      
Revenues 583,311 598,769 556,875 518,611 544,668 572,253 495,395 482,052 2,257,566 2,094,368 2,335,166
Expenses                      
Fuel oil                 587,768 454,704 654,600
Purchased power                 586,634 562,740 594,096
Other operation and maintenance                 417,910 405,533 413,089
Depreciation                 192,784 187,061 177,380
Taxes, other than income taxes                 214,949 199,862 221,885
Total expenses                 2,000,045 1,809,900 2,061,050
Operating income 66,460 87,076 55,047 48,938 68,644 89,812 70,686 55,326 257,521 284,468 274,116
Allowance for equity funds used during construction                 12,483 8,325 6,928
Interest expense and other charges, net                 (69,637) (66,824) (66,370)
Allowance for borrowed funds used during construction                 4,778 3,144 2,457
Income before income taxes                 205,145 229,113 217,131
Income taxes                 83,199 84,801 79,422
Net income (loss) 25,854 47,985 26,143 21,964 34,618 47,472 36,356 25,866 121,946 144,312 137,709
Preferred stock dividends of subsidiaries                 915 915 915
Net income attributable to Hawaiian Electric                 121,031 143,397 136,794
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock $ 25,355 $ 47,487 $ 25,644 $ 21,465 $ 34,119 $ 46,974 $ 35,857 $ 25,367 $ 119,951 $ 142,317 $ 135,714