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Consolidating financial information (Details) - HECO (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Operating expenses |  |  |  |  |
Purchased power |  | $ 178,000 | $ 188,000 | $ 332,000 | $ 353,000
Other income (loss) |  |  |  |  |
Allowance for equity funds used during construction |  | 1,560 | 1,997 | 2,775 | 3,937
Interest and other charges |  |  |  |  |
Allowance for borrowed funds used during construction |  | (398) | (893) | (1,128) | (1,763)
Net income |  | 41,061 | 39,273 | 75,213 | 78,062
Preferred stock dividends of subsidiaries |  | 473 | 473 | 946 | 946
Net income for common stock |  | 40,588 | 38,800 | 74,267 | 77,116
HECO |  |  |  |  |
Operating revenues | 5,300 | 521,730 | 567,527 | 1,027,559 | 1,098,140
Operating expenses |  |  |  |  |
Fuel oil |  | 203,379 | 241,393 | 425,346 | 476,419
Purchased power |  | 135,271 | 141,136 | 246,426 | 265,916
Other operation |  | 48,084 | 44,621 | 98,195 | 84,569
Maintenance |  | 19,651 | 20,542 | 41,303 | 41,378
Depreciation |  | 25,001 | 22,737 | 49,708 | 45,308
Taxes, other than income taxes |  | 49,287 | 55,440 | 97,372 | 105,993
Income taxes |  | 12,886 | 13,361 | 20,197 | 25,324
Total operating expenses |  | 493,559 | 539,230 | 978,547 | 1,044,907
Operating income |  | 28,171 | 28,297 | 49,012 | 53,233
Other income (loss) |  |  |  |  |
Allowance for equity funds used during construction |  | 1,247 | 1,654 | 2,230 | 3,235
Equity in earnings of subsidiaries |  | 8,667 | 8,250 | 19,652 | 16,740
Other, net |  | 702 | 1,173 | 2,723 | 2,266
Income tax benefits (expense) |  | 41 | (36) | (189) | (65)
Total other income |  | 10,657 | 11,041 | 24,416 | 22,176
Interest and other charges |  |  |  |  |
Interest on long-term debt |  | 9,901 | 10,190 | 19,803 | 19,320
Amortization of net bond premium and expense |  | 411 | 429 | 821 | 912
Other interest charges (credits) |  | (105) | (167) | 52 | (554)
Allowance for borrowed funds used during construction |  | (342) | (760) | (910) | (1,485)
Total interest and other charges |  | 9,865 | 9,692 | 19,766 | 18,193
Net income |  | 28,963 | 29,646 | 53,662 | 57,216
Net income attributable to HECO |  | 28,963 | 29,646 | 53,662 | 57,216
Preferred stock dividends of HECO |  | 270 | 270 | 540 | 540
Net income for common stock |  | 28,693 | 29,376 | 53,122 | 56,676
HELCO |  |  |  |  |
Operating revenues |  | 106,374 | 111,741 | 212,390 | 224,068
Operating expenses |  |  |  |  |
Fuel oil |  | 33,569 | 30,616 | 66,505 | 63,026
Purchased power |  | 29,278 | 37,395 | 59,400 | 71,303
Other operation |  | 10,146 | 9,948 | 21,210 | 18,963
Maintenance |  | 4,301 | 4,885 | 8,107 | 9,134
Depreciation |  | 8,547 | 8,301 | 17,094 | 16,737
Taxes, other than income taxes |  | 9,960 | 10,423 | 19,646 | 20,886
Income taxes |  | 3,060 | 2,831 | 5,774 | 7,054
Total operating expenses |  | 98,861 | 104,399 | 197,736 | 207,103
Operating income |  | 7,513 | 7,342 | 14,654 | 16,965
Other income (loss) |  |  |  |  |
Allowance for equity funds used during construction |  | 192 | 160 | 330 | 285
Other, net |  | 167 | 117 | 309 | 232
Income tax benefits (expense) |  | (18) | (18) | (41) | (32)
Total other income |  | 341 | 259 | 598 | 485
Interest and other charges |  |  |  |  |
Interest on long-term debt |  | 2,751 | 2,913 | 5,501 | 5,898
Amortization of net bond premium and expense |  | 117 | 108 | 234 | 245
Other interest charges (credits) |  | 16 | 20 | 85 | 53
Allowance for borrowed funds used during construction |  | (43) | (64) | (135) | (115)
Total interest and other charges |  | 2,841 | 2,977 | 5,685 | 6,081
Net income |  | 5,013 | 4,624 | 9,567 | 11,369
Preferred stock dividends of subsidiaries |  | 133 | 133 | 267 | 267
Net income attributable to HECO |  | 4,880 | 4,491 | 9,300 | 11,102
Net income for common stock |  | 4,880 | 4,491 | 9,300 | 11,102
MECO |  |  |  |  |
Operating revenues |  | 100,689 | 108,417 | 205,041 | 213,415
Operating expenses |  |  |  |  |
Fuel oil |  | 52,330 | 59,055 | 102,527 | 119,458
Purchased power |  | 13,895 | 9,821 | 25,982 | 15,922
Other operation |  | 7,954 | 9,947 | 18,202 | 22,833
Maintenance |  | 3,388 | 5,808 | 7,632 | 10,761
Depreciation |  | 5,042 | 5,095 | 10,068 | 10,570
Taxes, other than income taxes |  | 9,512 | 10,441 | 19,428 | 20,420
Income taxes |  | 2,387 | 2,382 | 6,457 | 3,561
Total operating expenses |  | 94,508 | 102,549 | 190,296 | 203,525
Operating income |  | 6,181 | 5,868 | 14,745 | 9,890
Other income (loss) |  |  |  |  |
Allowance for equity funds used during construction |  | 121 | 183 | 215 | 417
Other, net |  | 111 | 144 | 288 | 255
Income tax benefits (expense) |  | (15) | 2 | (61) | 2
Total other income |  | 217 | 329 | 442 | 674
Interest and other charges |  |  |  |  |
Interest on long-term debt |  | 1,962 | 2,220 | 3,924 | 4,488
Amortization of net bond premium and expense |  | 119 | 124 | 239 | 249
Other interest charges (credits) |  | 446 | 66 | 563 | 159
Allowance for borrowed funds used during construction |  | (13) | (69) | (83) | (163)
Total interest and other charges |  | 2,514 | 2,341 | 4,643 | 4,733
Net income |  | 3,884 | 3,856 | 10,544 | 5,831
Preferred stock dividends of subsidiaries |  | 96 | 96 | 191 | 191
Net income attributable to HECO |  | 3,788 | 3,760 | 10,353 | 5,640
Net income for common stock |  | 3,788 | 3,760 | 10,353 | 5,640
Other subsidiaries |  |  |  |  |
Other income (loss) |  |  |  |  |
Other, net |  | (1) | (1) | (1) | (2)
Total other income |  | (1) | (1) | (1) | (2)
Interest and other charges |  |  |  |  |
Net income |  | (1) | (1) | (1) | (2)
Net income attributable to HECO |  | (1) | (1) | (1) | (2)
Net income for common stock |  | (1) | (1) | (1) | (2)
Consolidating adjustments |  |  |  |  |
Other income (loss) |  |  |  |  |
Equity in earnings of subsidiaries |  | (8,667) | (8,250) | (19,652) | (16,740)
Other, net |  | (39) | (18) | (67) | (28)
Total other income |  | (8,706) | (8,268) | (19,719) | (16,768)
Interest and other charges |  |  |  |  |
Other interest charges (credits) |  | (39) | (18) | (67) | (28)
Total interest and other charges |  | (39) | (18) | (67) | (28)
Net income |  | (8,667) | (8,250) | (19,652) | (16,740)
Net income attributable to HECO |  | (8,667) | (8,250) | (19,652) | (16,740)
Net income for common stock |  | (8,667) | (8,250) | (19,652) | (16,740)
HECO Consolidated |  |  |  |  |
Operating revenues |  | 728,793 | 787,685 | 1,444,990 | 1,535,623
Operating expenses |  |  |  |  |
Fuel oil |  | 289,278 | 331,064 | 594,378 | 658,903
Purchased power |  | 178,444 | 188,352 | 331,808 | 353,141
Other operation |  | 66,184 | 64,516 | 137,607 | 126,365
Maintenance |  | 27,340 | 31,235 | 57,042 | 61,273
Depreciation |  | 38,590 | 36,133 | 76,870 | 72,615
Taxes, other than income taxes |  | 68,759 | 76,304 | 136,446 | 147,299
Income taxes |  | 18,333 | 18,574 | 32,428 | 35,939
Total operating expenses |  | 686,928 | 746,178 | 1,366,579 | 1,455,535
Operating income |  | 41,865 | 41,507 | 78,411 | 80,088
Other income (loss) |  |  |  |  |
Allowance for equity funds used during construction |  | 1,560 | 1,997 | 2,775 | 3,937
Other, net |  | 940 | 1,414 | 3,252 | 2,723
Income tax benefits (expense) |  | 8 | (51) | (291) | (95)
Total other income |  | 2,508 | 3,360 | 5,736 | 6,565
Interest and other charges |  |  |  |  |
Interest on long-term debt |  | 14,614 | 15,323 | 29,228 | 29,706
Amortization of net bond premium and expense |  | 647 | 661 | 1,294 | 1,406
Other interest charges (credits) |  | 318 | (99) | 633 | (370)
Allowance for borrowed funds used during construction |  | (398) | (893) | (1,128) | (1,763)
Total interest and other charges |  | 15,181 | 14,992 | 30,027 | 28,979
Net income |  | 29,192 | 29,875 | 54,120 | 57,674
Preferred stock dividends of subsidiaries |  | 229 | 229 | 458 | 458
Net income attributable to HECO |  | 28,963 | 29,646 | 53,662 | 57,216
Preferred stock dividends of HECO |  | 270 | 270 | 540 | 540
Net income for common stock |  | $ 28,693 | $ 29,376 | $ 53,122 | $ 56,676

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