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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, 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:                      
Depreciation of property, plant and equipment                 $ 183,966 $ 172,762 $ 160,061
Interest expense, net                 88,476 87,160 85,556
Income before income taxes                 254,788 265,598 249,836
Income tax benefits                 (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
Hawaiian Electric Industries, Inc.                      
Revenues                      
Revenues                 327 303 288
Equity in income of subsidiaries                 190,033 188,727 180,552
Expenses:                      
Operating, administrative and general                 34,350 20,921 16,063
Depreciation of property, plant and equipment                 576 575 596
Taxes, other than income taxes                 440 469 497
Interest expense, net                 10,788 11,599 16,207
Income before income taxes                 144,206 155,466 147,477
Income tax benefits                 15,671 13,047 14,232
Net income (loss)                 $ 159,877 $ 168,513 $ 161,709