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Electric utility segment - Consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating expenses    
Purchased power $ 116,000 $ 136,000
Total expenses 482,109 568,356
Total operating income 68,851 69,506
Other income    
Allowance for equity funds used during construction 1,739 1,413
Interest and other charges    
Allowance for borrowed funds used during construction 662 499
Income taxes 18,301 19,979
Net income 32,825 32,339
Preferred stock dividends of subsidiaries 473 473
Net income for common stock 32,352 31,866
Hawaiian Electric Company    
Condensed Income Statements, Captions [Line Items]    
Revenues 337,175 399,741
Operating expenses    
Fuel oil 74,085 118,403
Purchased power 91,917 103,250
Other operation and maintenance 69,558 70,084
Depreciation 31,522 29,389
Taxes, other than income taxes 32,684 38,201
Total expenses 299,766 359,327
Total operating income 37,409 40,414
Other income    
Allowance for equity funds used during construction 1,406 1,123
Equity in earnings of subsidiaries 7,929 7,692
Interest and other charges    
Interest expense and other charges, net (11,865) (11,238)
Allowance for borrowed funds used during construction 529 388
Income before income taxes 35,408 38,379
Income taxes 9,771 11,235
Net income 25,637 27,144
Net income attributable to Hawaiian Electric 25,637 27,144
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock 25,367 26,874
HELCO    
Condensed Income Statements, Captions [Line Items]    
Revenues 73,183 88,055
Operating expenses    
Fuel oil 14,374 23,385
Purchased power 16,797 21,893
Other operation and maintenance 16,441 16,399
Depreciation 9,449 9,313
Taxes, other than income taxes 6,891 8,384
Total expenses 63,952 79,374
Total operating income 9,231 8,681
Other income    
Allowance for equity funds used during construction 127 145
Interest and other charges    
Interest expense and other charges, net (2,965) (2,680)
Allowance for borrowed funds used during construction 49 53
Income before income taxes 6,442 6,199
Income taxes 2,346 2,277
Net income 4,096 3,922
Preferred stock dividends of subsidiaries 134 134
Net income attributable to Hawaiian Electric 3,962 3,788
Net income for common stock 3,962 3,788
Maui Electric    
Condensed Income Statements, Captions [Line Items]    
Revenues 71,706 85,674
Operating expenses    
Fuel oil 25,281 35,018
Purchased power 7,145 10,864
Other operation and maintenance 17,909 17,519
Depreciation 5,810 5,541
Taxes, other than income taxes 6,863 8,163
Total expenses 63,008 77,105
Total operating income 8,698 8,569
Other income    
Allowance for equity funds used during construction 206 145
Interest and other charges    
Interest expense and other charges, net (2,490) (2,435)
Allowance for borrowed funds used during construction 84 58
Income before income taxes 6,498 6,337
Income taxes 2,436 2,338
Net income 4,062 3,999
Preferred stock dividends of subsidiaries 95 95
Net income attributable to Hawaiian Electric 3,967 3,904
Net income for common stock 3,967 3,904
Other subsidiaries    
Condensed Income Statements, Captions [Line Items]    
Revenues 0 0
Operating expenses    
Other operation and maintenance 0 0
Total expenses 0 0
Total operating income 0 0
Interest and other charges    
Income before income taxes 0 0
Income taxes 0 0
Net income 0 0
Net income attributable to Hawaiian Electric 0 0
Net income for common stock 0 0
Consolidating adjustments    
Condensed Income Statements, Captions [Line Items]    
Revenues (12) (28)
Operating expenses    
Total operating income (12) (28)
Other income    
Equity in earnings of subsidiaries (7,929) (7,692)
Interest and other charges    
Interest expense and other charges, net 12 28
Income before income taxes (7,929) (7,692)
Income taxes 0 0
Net income (7,929) (7,692)
Net income attributable to Hawaiian Electric (7,929) (7,692)
Net income for common stock (7,929) (7,692)
Hawaiian Electric Company, Inc. and Subsidiaries    
Condensed Income Statements, Captions [Line Items]    
Revenues 482,052 573,442
Operating expenses    
Fuel oil 113,740 176,806
Purchased power 115,859 136,007
Other operation and maintenance 103,908 104,002
Depreciation 46,781 44,243
Taxes, other than income taxes 46,438 54,748
Total expenses 426,726 515,806
Total operating income 55,326 57,636
Other income    
Allowance for equity funds used during construction 1,739 1,413
Interest and other charges    
Interest expense and other charges, net (17,308) (16,325)
Allowance for borrowed funds used during construction 662 499
Income before income taxes 40,419 43,223
Income taxes 14,553 15,850
Net income 25,866 27,373
Preferred stock dividends of subsidiaries 229 229
Net income attributable to Hawaiian Electric 25,637 27,144
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock $ 25,367 $ 26,874