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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 851,028 | $ 886,355 | $ 794,319 | $ 710,633 | $ 695,737 | $ 694,541 | $ 655,664 | $ 619,040 | $ 3,242,335 | $ 2,664,982 | $ 2,309,590
Expenses |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 148,152 | 154,523 | 151,282
Total expenses |  |  |  |  |  |  |  |  | 2,952,639 | 2,408,771 | 2,121,926
Operating income | 68,170 | 94,490 | 63,661 | 63,375 | 59,242 | 72,631 | 63,631 | 60,707 | 289,696 | 256,211 | 187,664
Interest expenses |  |  |  |  |  |  |  |  | 96,575 | 101,887 | 119,873
Income before income tax benefits |  |  |  |  |  |  |  |  | 216,052 | 183,247 | 128,824
Income tax benefits |  |  |  |  |  |  |  |  | 75,932 | 67,822 | 43,923
Net income |  |  |  |  |  |  |  |  | 140,120 | 115,425 | 84,901
Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 253 | 204 | 400
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 158,722 | 134,470 | 100,896
Total revenues |  |  |  |  |  |  |  |  | 158,975 | 134,674 | 101,296
Expenses |  |  |  |  |  |  |  |  |  |  |
Operating, administrative and general |  |  |  |  |  |  |  |  | 15,401 | 13,336 | 12,675
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 227 | 320 | 409
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 409 | 314 | 337
Total expenses |  |  |  |  |  |  |  |  | 16,037 | 13,970 | 13,421
Operating income |  |  |  |  |  |  |  |  | 142,938 | 120,704 | 87,875
Interest expenses |  |  |  |  |  |  |  |  | 22,013 | 19,961 | 18,517
Income before income tax benefits |  |  |  |  |  |  |  |  | 120,925 | 100,743 | 69,358
Income tax benefits |  |  |  |  |  |  |  |  | 17,305 | 12,792 | 13,653
Net income |  |  |  |  |  |  |  |  | $ 138,230 | $ 113,535 | $ 83,011

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