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Electric utility segment - Consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating expenses        
Purchased power $ 158,000 $ 161,000 $ 413,000 $ 446,000
Total expenses 540,613 620,081 1,503,511 1,739,619
Total operating income 105,442 97,095 259,748 239,331
Other income        
Allowance for equity funds used during construction 2,274 2,057 6,010 5,366
Interest and other charges        
Allowance for borrowed funds used during construction 854 737 2,276 1,918
Income taxes 51,592 29,516 96,203 70,406
Net income 127,613 51,144 205,039 118,974
Preferred stock dividends of subsidiaries 471 471 1,417 1,417
Net income for common stock 127,142 50,673 203,622 117,557
Hawaiian Electric Company        
Condensed Income Statements, Captions [Line Items]        
Revenues 404,352 463,394 1,088,537 1,254,142
Operating expenses        
Fuel oil 88,676 142,194 224,995 364,875
Purchased power 118,751 119,302 313,730 329,922
Other operation and maintenance 64,683 69,621 202,438 206,133
Depreciation 31,520 29,389 94,564 88,167
Taxes, other than income taxes 38,666 43,923 104,764 119,603
Total expenses 342,296 404,429 940,491 1,108,700
Total operating income 62,056 58,965 148,046 145,442
Other income        
Allowance for equity funds used during construction 1,806 1,714 4,771 4,418
Equity in earnings of subsidiaries 14,729 11,858 33,541 29,174
Interest and other charges        
Interest expense and other charges, net (11,903) (11,468) (34,113) (33,996)
Allowance for borrowed funds used during construction 669 605 1,785 1,557
Income before income taxes 67,357 61,674 154,030 146,595
Income taxes 20,113 18,398 45,022 43,064
Net income 47,244 43,276 109,008 103,531
Preferred stock dividends of subsidiaries 0 0 0 0
Net income attributable to Hawaiian Electric 47,244 43,276 109,008 103,531
Preferred stock dividends of Hawaiian Electric 270 270 810 810
Net income for common stock 46,974 43,006 108,198 102,721
HELCO        
Condensed Income Statements, Captions [Line Items]        
Revenues 83,105 89,817 229,940 261,604
Operating expenses        
Fuel oil 14,603 17,208 40,725 56,834
Purchased power 22,728 26,713 58,885 73,161
Other operation and maintenance 15,017 18,936 46,574 51,493
Depreciation 9,449 9,313 28,347 27,938
Taxes, other than income taxes 7,836 8,455 21,632 24,783
Total expenses 69,633 80,625 196,163 234,209
Total operating income 13,472 9,192 33,777 27,395
Other income        
Allowance for equity funds used during construction 238 148 571 458
Equity in earnings of subsidiaries 0 0 0 0
Interest and other charges        
Interest expense and other charges, net (2,972) (2,674) (8,606) (7,946)
Allowance for borrowed funds used during construction 91 53 219 164
Income before income taxes 10,829 6,719 25,961 20,071
Income taxes 3,392 2,397 9,075 7,210
Net income 7,437 4,322 16,886 12,861
Preferred stock dividends of subsidiaries 133 133 400 400
Net income attributable to Hawaiian Electric 7,304 4,189 16,486 12,461
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock 7,304 4,189 16,486 12,461
Maui Electric        
Condensed Income Statements, Captions [Line Items]        
Revenues 84,831 94,941 231,295 264,057
Operating expenses        
Fuel oil 25,345 36,231 68,543 96,961
Purchased power 16,271 14,503 40,052 42,726
Other operation and maintenance 15,089 15,096 49,248 48,893
Depreciation 5,790 5,654 17,389 16,735
Taxes, other than income taxes 8,017 8,932 21,990 25,054
Total expenses 70,512 80,416 197,222 230,369
Total operating income 14,319 14,525 34,073 33,688
Other income        
Allowance for equity funds used during construction 230 195 668 490
Equity in earnings of subsidiaries 0 0 0 0
Interest and other charges        
Interest expense and other charges, net (2,483) (2,440) (7,087) (7,299)
Allowance for borrowed funds used during construction 94 79 272 197
Income before income taxes 12,160 12,359 27,926 27,076
Income taxes 4,640 4,595 10,585 10,077
Net income 7,520 7,764 17,341 16,999
Preferred stock dividends of subsidiaries 95 95 286 286
Net income attributable to Hawaiian Electric 7,425 7,669 17,055 16,713
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock 7,425 7,669 17,055 16,713
Other subsidiaries        
Condensed Income Statements, Captions [Line Items]        
Revenues 0 0 0 0
Operating 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
Other income        
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries 0 0 0 0
Interest and other charges        
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 (35) (25) (72) (71)
Operating 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 (35) (25) (72) (71)
Other income        
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries (14,729) (11,858) (33,541) (29,174)
Interest and other charges        
Interest expense and other charges, net 35 25 72 71
Allowance for borrowed funds used during construction 0 0 0 0
Income before income taxes (14,729) (11,858) (33,541) (29,174)
Income taxes 0 0 0 0
Net income (14,729) (11,858) (33,541) (29,174)
Preferred stock dividends of subsidiaries 0 0 0 0
Net income attributable to Hawaiian Electric (14,729) (11,858) (33,541) (29,174)
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock (14,729) (11,858) (33,541) (29,174)
Hawaiian Electric Company, Inc. and Subsidiaries        
Condensed Income Statements, Captions [Line Items]        
Revenues 572,253 648,127 1,549,700 1,779,732
Operating expenses        
Fuel oil 128,624 195,633 334,263 518,670
Purchased power 157,750 160,518 412,667 445,809
Other operation and maintenance 94,789 103,653 298,260 306,519
Depreciation 46,759 44,356 140,300 132,840
Taxes, other than income taxes 54,519 61,310 148,386 169,440
Total expenses 482,441 565,470 1,333,876 1,573,278
Total operating income 89,812 82,657 215,824 206,454
Other income        
Allowance for equity funds used during construction 2,274 2,057 6,010 5,366
Equity in earnings of subsidiaries 0 0 0 0
Interest and other charges        
Interest expense and other charges, net (17,323) (16,557) (49,734) (49,170)
Allowance for borrowed funds used during construction 854 737 2,276 1,918
Income before income taxes 75,617 68,894 174,376 164,568
Income taxes 28,145 25,390 64,682 60,351
Net income 47,472 43,504 109,694 104,217
Preferred stock dividends of subsidiaries 228 228 686 686
Net income attributable to Hawaiian Electric 47,244 43,276 109,008 103,531
Preferred stock dividends of Hawaiian Electric 270 270 810 810
Net income for common stock $ 46,974 $ 43,006 $ 108,198 $ 102,721