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Reconciliation of electric utility operating income per HEI and HECO consolidated statements of income (Details) - HECO (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Operating income from regulated and nonregulated activities before income taxes (per HEI consolidated statements of income) | $ 90,099 | $ 91,702 | $ 243,126 | $ 246,924
Income taxes on regulated activities | (22,841) | (25,804) | (65,157) | (69,926)
Electric utility |  |  |  |
Operating income from regulated and nonregulated activities before income taxes (per HEI consolidated statements of income) | 71,914 | 74,819 | 186,005 | 193,569
Income taxes on regulated activities | (19,058) | (22,395) | (51,777) | (58,429)
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Operating income | 36,200 | 35,300 | 85,212 | 88,533
Hawaiian Electric Company, Inc. and Subsidiaries | Electric utility |  |  |  |
Operating income from regulated and nonregulated activities before income taxes (per HEI consolidated statements of income) | 71,914 | 74,819 | 186,005 | 193,569
Income taxes on regulated activities | (18,928) | (22,352) | (51,356) | (58,291)
Revenues from nonregulated activities | (2,182) | (1,892) | (7,153) | (5,431)
Add: Expenses from nonregulated activities | 1,082 | 804 | 2,801 | 1,620
Operating income | $ 51,886 | $ 51,379 | $ 130,297 | $ 131,467

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