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Electric utility subsidiary - Consolidating financial statements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Operating expenses        
Purchased power $ 193,000 $ 195,000 $ 546,000 $ 527,000
Total expenses 775,994 741,130 2,187,819 2,168,897
Operating income 91,102 88,038 261,683 237,070
Other income (loss)        
Allowance for equity funds used during construction 1,937 1,255 4,933 4,030
Interest and other charges        
Allowance for borrowed funds used during construction 740 498 1,877 1,626
Income taxes 26,323 22,041 73,265 62,590
Net income 48,286 48,707 136,580 123,920
Preferred stock dividends of subsidiaries 471 471 1,417 1,417
Net income for common stock 47,815 48,236 135,163 122,503
Hawaiian Electric Company
        
Revenues 579,777 547,434 1,623,223 1,576,068
Operating expenses        
Fuel oil 229,068 206,478 628,164 631,824
Purchased power 142,121 143,280 406,895 389,706
Other operation and maintenance 71,584 71,498 199,091 212,474
Depreciation 27,302 25,442 81,903 75,150
Taxes, other than income taxes 54,412 51,781 152,545 149,282
Total expenses 524,487 498,479 1,468,598 1,458,436
Operating income 55,290 48,955 154,625 117,632
Other income (loss)        
Allowance for equity funds used during construction 1,668 914 4,557 3,144
Equity in earnings of subsidiaries 9,800 10,794 28,576 30,446
Interest expense and other charges, net (11,196) (9,883) (33,236) (28,723)
Interest and other charges        
Allowance for borrowed funds used during construction 634 358 1,728 1,268
Income before income taxes 56,196 51,138 156,250 123,767
Income taxes 17,047 13,051 46,911 32,018
Net income 39,149 38,087 109,339 91,749
Net income attributable to Hawaiian Electric 39,149 38,087 109,339 91,749
Preferred stock dividends of Hawaiian Electric 270 270 810 810
Net income for common stock 38,879 37,817 108,529 90,939
HELCO
        
Revenues 111,154 107,957 319,629 320,330
Operating expenses        
Fuel oil 29,555 27,615 92,234 94,120
Purchased power 34,166 34,480 91,827 93,880
Other operation and maintenance 19,837 16,793 48,701 46,158
Depreciation 8,975 8,547 26,926 25,641
Taxes, other than income taxes 10,607 10,457 30,127 30,113
Total expenses 103,140 97,892 289,815 289,912
Operating income 8,014 10,065 29,814 30,418
Other income (loss)        
Allowance for equity funds used during construction 142 222 328 552
Interest expense and other charges, net (2,811) (2,920) (8,411) (8,566)
Interest and other charges        
Allowance for borrowed funds used during construction 54 91 126 226
Income before income taxes 5,399 7,458 21,857 22,630
Income taxes 1,965 1,881 8,149 7,486
Net income 3,434 5,577 13,708 15,144
Preferred stock dividends of subsidiaries 133 133 400 400
Net income attributable to Hawaiian Electric 3,301 5,444 13,308 14,744
Net income for common stock 3,301 5,444 13,308 14,744
Maui Electric
        
Revenues 112,656 108,699 319,265 313,725
Operating expenses        
Fuel oil 50,809 49,267 145,591 151,794
Purchased power 16,595 17,101 47,399 43,083
Other operation and maintenance 16,892 16,221 47,691 42,089
Depreciation 5,317 5,006 15,961 15,074
Taxes, other than income taxes 10,169 10,234 30,111 29,681
Total expenses 99,782 97,829 286,753 281,721
Operating income 12,874 10,870 32,512 32,004
Other income (loss)        
Allowance for equity funds used during construction 127 119 48 334
Interest expense and other charges, net (2,429) (2,266) (7,403) (6,774)
Interest and other charges        
Allowance for borrowed funds used during construction 52 49 23 132
Income before income taxes 10,624 8,772 25,180 25,696
Income taxes 4,030 3,326 9,626 9,706
Net income 6,594 5,446 15,554 15,990
Preferred stock dividends of subsidiaries 95 95 286 286
Net income attributable to Hawaiian Electric 6,499 5,351 15,268 15,704
Net income for common stock 6,499 5,351 15,268 15,704
Other subsidiaries
        
Revenues 0 0 0 0
Operating expenses        
Other operation and maintenance 0 1 0 2
Total expenses 0 1 0 2
Operating income 0 (1) 0 (2)
Interest and other charges        
Income before income taxes 0 (1) 0 (2)
Income taxes 0 0 0 0
Net income 0 (1) 0 (2)
Net income attributable to Hawaiian Electric 0 (1) 0 (2)
Net income for common stock 0 (1) 0 (2)
Consolidating adjustments
        
Revenues (22) (36) (61) (103)
Operating expenses        
Operating income (22) (36) (61) (103)
Other income (loss)        
Equity in earnings of subsidiaries (9,800) (10,794) (28,576) (30,446)
Interest expense and other charges, net 22 36 61 103
Interest and other charges        
Income before income taxes (9,800) (10,794) (28,576) (30,446)
Income taxes 0 0 0 0
Net income (9,800) (10,794) (28,576) (30,446)
Net income attributable to Hawaiian Electric (9,800) (10,794) (28,576) (30,446)
Net income for common stock (9,800) (10,794) (28,576) (30,446)
HECO Consolidated
        
Revenues 803,565 764,054 2,262,056 2,210,020
Operating expenses        
Fuel oil 309,432 283,360 865,989 877,738
Purchased power 192,882 194,861 546,121 526,669
Other operation and maintenance 108,313 104,513 295,483 300,723
Depreciation 41,594 38,995 124,790 115,865
Taxes, other than income taxes 75,188 72,472 212,783 209,076
Total expenses 727,409 694,201 2,045,166 2,030,071
Operating income 76,156 69,853 216,890 179,949
Other income (loss)        
Allowance for equity funds used during construction 1,937 1,255 4,933 4,030
Interest expense and other charges, net (16,414) (15,033) (48,989) (43,960)
Interest and other charges        
Allowance for borrowed funds used during construction 740 498 1,877 1,626
Income before income taxes 62,419 56,573 174,711 141,645
Income taxes 23,042 18,258 64,686 49,210
Net income 39,377 38,315 110,025 92,435
Preferred stock dividends of subsidiaries 228 228 686 686
Net income attributable to Hawaiian Electric 39,149 38,087 109,339 91,749
Preferred stock dividends of Hawaiian Electric 270 270 810 810
Net income for common stock $ 38,879 $ 37,817 $ 108,529 $ 90,939