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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Self-insured United States longshore & Harbor bond | Dec. 31, 2013 Self-insured automobile bond | Dec. 31, 2013 HEI medium-term note 5.25%, due 2013 | Dec. 31, 2012 HEI medium-term note 5.25%, due 2013 | Dec. 31, 2013 HEI medium-term note 6.51%, due 2014 | Dec. 31, 2012 HEI medium-term note 6.51%, due 2014 | Dec. 31, 2013 HEI senior note 4.41%, due 2016 | Dec. 31, 2012 HEI senior note 4.41%, due 2016 | Dec. 31, 2013 HEI senior note 5.67%, due 2021 | Dec. 31, 2012 HEI senior note 5.67%, due 2021 | Dec. 31, 2013 HEI senior note 3.99%, due 2023 | Mar. 06, 2013 HEI senior note 3.99%, due 2023 | Dec. 31, 2012 HEI senior note 3.99%, due 2023 | Dec. 31, 2013 Hawaiian Electric Industries, Inc. | Dec. 31, 2012 Hawaiian Electric Industries, Inc. | Dec. 31, 2011 Hawaiian Electric Industries, Inc. | Dec. 31, 2010 Hawaiian Electric Industries, Inc. | Dec. 31, 2013 Hawaiian Electric Industries, Inc. HEI medium-term note 5.25%, due 2013 | Dec. 31, 2012 Hawaiian Electric Industries, Inc. HEI medium-term note 5.25%, due 2013 | Dec. 31, 2013 Hawaiian Electric Industries, Inc. HEI medium-term note 6.51%, due 2014 | Dec. 31, 2012 Hawaiian Electric Industries, Inc. HEI medium-term note 6.51%, due 2014 | Dec. 31, 2013 Hawaiian Electric Industries, Inc. HEI senior note 4.41%, due 2016 | Dec. 31, 2012 Hawaiian Electric Industries, Inc. HEI senior note 4.41%, due 2016 | Dec. 31, 2013 Hawaiian Electric Industries, Inc. HEI senior note 5.67%, due 2021 | Dec. 31, 2012 Hawaiian Electric Industries, Inc. HEI senior note 5.67%, due 2021 | Dec. 31, 2013 Hawaiian Electric Industries, Inc. HEI senior note 3.99%, due 2023
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ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 220,036,000 | $ 219,662,000 | $ 270,265,000 | $ 330,651,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 571,000 | $ 18,021,000 | $ 1,765,000 | $ 1,540,000 |  |  |  |  |  |  |  |  |
Accounts receivable | 346,785,000 | 362,823,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,661,000 | 1,836,000 |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 3,858,947,000 | 3,594,829,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,419,000 | 5,814,000 |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,594,000 | 8,517,000 |  |  |  |  |  |  |  |  |  |  |
Other assets | 519,194,000 | 494,414,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,679,000 | 8,390,000 |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries, at equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,122,841,000 | 1,978,283,000 |  |  |  |  |  |  |  |  |  |  |
Total assets | 10,340,044,000 | 10,149,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,155,765,000 | 2,020,861,000 |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 212,331,000 | 212,379,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 817,000 | 24,086,000 |  |  |  |  |  |  |  |  |  |  |
Interest payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,630,000 | 4,781,000 |  |  |  |  |  |  |  |  |  |  |
Notes payable to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,936,000 | 7,722,000 |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,482,000 | 83,694,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,492,945,000 | 1,422,872,000 |  |  |  |  | 0 | 50,000,000 | 100,000,000 | 100,000,000 | 75,000,000 | 75,000,000 | 50,000,000 | 50,000,000 | 50,000,000 |  | 0 | 275,000,000 | 275,000,000 |  |  | 0 | 50,000,000 | 100,000,000 | 100,000,000 | 75,000,000 | 75,000,000 | 50,000,000 | 50,000,000 | 50,000,000
Deferred income taxes | 586,499,000 | 491,203,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,385,000 | 0 |  |  |  |  |  |  |  |  |  |  |
Retirement benefits liability | 288,539,000 | 656,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,559,000 | 28,004,000 |  |  |  |  |  |  |  |  |  |  |
Other | 524,224,000 | 524,535,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,886,000 | 3,709,000 |  |  |  |  |  |  |  |  |  |  |
Total liabilities | 8,578,681,000 | 8,520,974,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 428,695,000 | 426,996,000 |  |  |  |  |  |  |  |  |  |  |
Shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, no par value, authorized 10,000,000 shares; issued: none | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 101,259,800 shares and 97,928,403 shares in 2013 and 2012, respectively | 1,488,126,000 | 1,403,484,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,488,126,000 | 1,403,484,000 |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 255,694,000 | 216,804,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 255,694,000 | 216,804,000 |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss | (16,750,000) | (26,423,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,750,000) | (26,423,000) |  |  |  |  |  |  |  |  |  |  |
Total shareholders' equity | 1,727,070,000 | 1,593,865,000 | 1,528,706,000 | 1,480,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,727,070,000 | 1,593,865,000 |  |  |  |  |  |  |  |  |  |  |
Total liabilities and shareholders' equity | 10,340,044,000 | 10,149,132,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,155,765,000 | 2,020,861,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate of medium-term notes (as a percent) |  |  |  |  |  |  | 5.25% | 5.25% | 6.51% | 6.51% | 4.41% | 4.41% | 5.67% | 5.67% | 3.99% | 3.99% | 3.99% |  |  |  |  | 5.25% | 5.25% | 6.51% | 6.51% | 4.41% | 4.41% | 5.67% | 5.67% | 3.99%
Aggregate principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 111,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2015 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
2016 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2017 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
2018 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Guarantee obligation maximum exposure |  |  |  |  | $ 200,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, authorized shares | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized shares | 200,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, issued shares | 101,259,800 | 97,928,403 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101,259,800 | 97,928,403 |  |  |  |  |  |  |  |  |  |  |
Common stock, outstanding shares | 101,259,800 | 97,928,403 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101,259,800 | 97,928,403 |  |  |  |  |  |  |  |  |  |  |

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