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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