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Electric utility subsidiary - Consolidating financial statements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating expenses    
Purchased power $ 165,000 $ 153,000
Total expenses 695,443 713,407
Operating income 88,306 68,825
Other income (loss)    
Allowance for equity funds used during construction 1,609 1,215
Interest and other charges    
Allowance for borrowed funds used during construction 614 730
Income taxes 24,673 17,887
Net income 46,400 34,152
Preferred stock dividends of subsidiaries 473 473
Net income for common stock 45,927 33,679
Hawaiian Electric Company
    
Revenues 512,455 507,058
Operating expenses    
Fuel oil 203,547 221,967
Purchased power 123,969 111,155
Other operation and maintenance 58,515 72,418
Depreciation 27,301 24,707
Taxes, other than income taxes 48,184 48,144
Total expenses 461,516 478,391
Operating income 50,939 28,667
Other income (loss)    
Allowance for equity funds used during construction 1,472 983
Equity in earnings of subsidiaries 8,917 10,985
Interest expense and other charges, net (10,487) (9,590)
Interest and other charges    
Allowance for borrowed funds used during construction 559 568
Income before income taxes 51,400 31,613
Income taxes 15,710 6,914
Net income 35,690 24,699
Net income attributable to Hawaiian Electric 35,690 24,699
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock 35,420 24,429
HELCO
    
Revenues 104,931 106,012
Operating expenses    
Fuel oil 31,500 32,936
Purchased power 29,491 30,122
Other operation and maintenance 14,047 14,888
Depreciation 8,975 8,547
Taxes, other than income taxes 9,763 9,691
Total expenses 93,776 96,184
Operating income 11,155 9,828
Other income (loss)    
Allowance for equity funds used during construction 65 138
Interest expense and other charges, net (2,748) (2,855)
Interest and other charges    
Allowance for borrowed funds used during construction 25 92
Income before income taxes 8,497 7,203
Income taxes 3,202 2,649
Net income 5,295 4,554
Preferred stock dividends of subsidiaries 134 134
Net income attributable to Hawaiian Electric 5,161 4,420
Net income for common stock 5,161 4,420
Maui Electric
    
Revenues 102,693 104,399
Operating expenses    
Fuel oil 51,253 50,197
Purchased power 11,456 12,087
Other operation and maintenance 16,044 14,507
Depreciation 5,327 5,026
Taxes, other than income taxes 10,024 9,928
Total expenses 94,104 91,745
Operating income 8,589 12,654
Other income (loss)    
Allowance for equity funds used during construction 72 94
Interest expense and other charges, net (2,505) (2,102)
Interest and other charges    
Allowance for borrowed funds used during construction 30 70
Income before income taxes 6,186 10,716
Income taxes 2,335 4,056
Net income 3,851 6,660
Preferred stock dividends of subsidiaries 95 95
Net income attributable to Hawaiian Electric 3,756 6,565
Net income for common stock 3,756 6,565
Other subsidiaries
    
Revenues 0 0
Operating expenses    
Other operation and maintenance 0 0
Total expenses 0 0
Operating income 0 0
Interest and other charges    
Income before income taxes 0 0
Income taxes 0 0
Net income 0 0
Net income attributable to Hawaiian Electric 0 0
Net income for common stock 0 0
Consolidating adjustments
    
Revenues (17) (28)
Operating expenses    
Operating income (17) (28)
Other income (loss)    
Equity in earnings of subsidiaries (8,917) (10,985)
Interest expense and other charges, net 17 28
Interest and other charges    
Income before income taxes (8,917) (10,985)
Income taxes 0 0
Net income (8,917) (10,985)
Net income attributable to Hawaiian Electric (8,917) (10,985)
Net income for common stock (8,917) (10,985)
HECO Consolidated
    
Revenues 720,062 717,441
Operating expenses    
Fuel oil 286,300 305,100
Purchased power 164,916 153,364
Other operation and maintenance 88,606 101,813
Depreciation 41,603 38,280
Taxes, other than income taxes 67,971 67,763
Total expenses 649,396 666,320
Operating income 70,666 51,121
Other income (loss)    
Allowance for equity funds used during construction 1,609 1,215
Interest expense and other charges, net (15,723) (14,519)
Interest and other charges    
Allowance for borrowed funds used during construction 614 730
Income before income taxes 57,166 38,547
Income taxes 21,247 13,619
Net income 35,919 24,928
Preferred stock dividends of subsidiaries 229 229
Net income attributable to Hawaiian Electric 35,690 24,699
Preferred stock dividends of Hawaiian Electric 270 270
Net income for common stock $ 35,420 $ 24,429