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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- STATEMENT OF INCOME AND CHANGES IN SHAREHOLDERS' EQUITY (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Expenses:                      
Depreciation of property, plant and equipment                 $ 194,273 $ 183,966 $ 172,762
Total expenses                 2,032,479 2,280,429 2,906,942
Merger termination fee                 90,000 0 0
Interest expense, net                 88,558 88,476 87,160
Income before income taxes                 373,841 254,788 265,598
Income tax benefits                 (123,695) (93,021) (95,579)
Net income $ 45,107 $ 127,613 $ 44,601 $ 32,825 $ 42,793 $ 51,144 $ 35,491 $ 32,339 250,146 161,767 170,019
Hawaiian Electric Industries, Inc.                      
Revenues                      
Revenues                 647 327 303
Equity in income of subsidiaries                 199,485 190,033 188,727
Expenses:                      
Operating, administrative and general                 18,701 34,350 20,921
Depreciation of property, plant and equipment                 566 576 575
Taxes, other than income taxes                 4,726 440 469
Total expenses                 23,993 35,366 21,965
Income before merger termination fee, interest expense and income (taxes) benefits                 176,139 154,994 167,065
Merger termination fee                 90,000 0 0
Income before interest expense and income (taxes) benefits                 266,139 154,994 167,065
Interest expense, net                 9,037 10,788 11,599
Income before income taxes                 257,102 144,206 155,466
Income tax benefits                 (8,846) 15,671 13,047
Net income                 $ 248,256 $ 159,877 $ 168,513