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Electric utility segment Consolidating Statement of Income (Details) - 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
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
HECO                      
Revenues                 1,644,181 2,142,245 2,124,174
Expenses                      
Fuel oil                 458,069 821,246 851,365
Purchased power                 440,983 537,821 527,839
Other operation and maintenance                 284,583 283,532 283,768
Depreciation                 117,682 109,204 99,738
Taxes, other than income taxes                 156,871 201,426 200,962
Impairment of utility assets                   0 0
Total expenses                 1,458,188 1,953,229 1,963,672
Operating income                 185,993 189,016 160,502
Allowance for equity funds used during construction                 5,641 6,085 4,495
Equity in earnings of subsidiaries                 42,920 40,964 41,410
Interest expense and other charges, net                 (45,899) (44,041) (39,107)
Allowance for borrowed funds used during construction                 1,967 2,306 1,814
Income before income taxes                 190,622 194,330 169,114
Income taxes                 53,828 55,609 45,105
Net income (loss)                 136,794 138,721 124,009
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                 135,714 137,641 122,929
HELCO                      
Revenues                 345,549 422,200 431,517
Expenses                      
Fuel oil                 71,851 117,215 125,516
Purchased power                 97,503 123,226 128,368
Other operation and maintenance                 63,098 65,471 61,418
Depreciation                 37,250 35,904 34,188
Taxes, other than income taxes                 32,312 39,521 40,092
Impairment of utility assets                   0 0
Total expenses                 302,014 381,337 389,582
Operating income                 43,535 40,863 41,935
Allowance for equity funds used during construction                 604 472 643
Interest expense and other charges, net                 (10,773) (11,030) (11,341)
Allowance for borrowed funds used during construction                 215 182 263
Income before income taxes                 33,581 30,487 31,500
Income taxes                 12,292 11,264 10,830
Net income (loss)                 21,289 19,223 20,670
Preferred stock dividends of subsidiaries                 534 534 534
Net income attributable to Hawaiian Electric                 20,755 18,689 20,136
Net income for common stock                 20,755 18,689 20,136
MECO                      
Revenues                 345,517 422,965 424,603
Expenses                      
Fuel oil                 124,680 193,224 208,671
Purchased power                 55,610 60,961 54,474
Other operation and maintenance                 65,408 61,609 58,081
Depreciation                 22,448 21,279 20,099
Taxes, other than income taxes                 32,702 39,916 40,077
Impairment of utility assets                   0 0
Total expenses                 300,848 376,989 381,402
Operating income                 44,669 45,976 43,201
Allowance for equity funds used during construction                 683 214 423
Interest expense and other charges, net                 (9,779) (9,773) (8,953)
Allowance for borrowed funds used during construction                 275 91 169
Income before income taxes                 35,848 36,508 34,840
Income taxes                 13,302 13,852 13,182
Net income (loss)                 22,546 22,656 21,658
Preferred stock dividends of subsidiaries                 381 381 381
Net income attributable to Hawaiian Electric                 22,165 22,275 21,277
Net income for common stock                 22,165 22,275 21,277
Other subsidiaries                      
Revenues                 0    
Expenses                      
Other operation and maintenance                 0 0 3
Total expenses                 0 0 3
Operating income                 0 0 (3)
Income before income taxes                 0 0 (3)
Income taxes                 0    
Net income (loss)                 0 0 (3)
Net income attributable to Hawaiian Electric                 0 0 (3)
Net income for common stock                 0 0 (3)
Consolidating adjustments                      
Revenues                 (81) (87) (122)
Expenses                      
Operating income                 (81) (87) (122)
Equity in earnings of subsidiaries                 (42,920) (40,964) (41,410)
Interest expense and other charges, net                 81 87 122
Income before income taxes                 (42,920) (40,964) (41,410)
Income taxes                 0    
Net income (loss)                 (42,920) (40,964) (41,410)
Net income attributable to Hawaiian Electric                 (42,920) (40,964) (41,410)
Net income for common stock                 (42,920) (40,964) (41,410)
HECO Consolidated                      
Revenues                 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
Impairment of utility assets                   0 0
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