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Electric utility segment - Consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Operating expenses |  |
Purchased power | $ 116,000 | $ 136,000
Total expenses | 482,109 | 568,356
Total operating income | 68,851 | 69,506
Other income |  |
Allowance for equity funds used during construction | 1,739 | 1,413
Interest and other charges |  |
Allowance for borrowed funds used during construction | 662 | 499
Income taxes | 18,301 | 19,979
Net income | 32,825 | 32,339
Preferred stock dividends of subsidiaries | 473 | 473
Net income for common stock | 32,352 | 31,866
Hawaiian Electric Company |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 337,175 | 399,741
Operating expenses |  |
Fuel oil | 74,085 | 118,403
Purchased power | 91,917 | 103,250
Other operation and maintenance | 69,558 | 70,084
Depreciation | 31,522 | 29,389
Taxes, other than income taxes | 32,684 | 38,201
Total expenses | 299,766 | 359,327
Total operating income | 37,409 | 40,414
Other income |  |
Allowance for equity funds used during construction | 1,406 | 1,123
Equity in earnings of subsidiaries | 7,929 | 7,692
Interest and other charges |  |
Interest expense and other charges, net | (11,865) | (11,238)
Allowance for borrowed funds used during construction | 529 | 388
Income before income taxes | 35,408 | 38,379
Income taxes | 9,771 | 11,235
Net income | 25,637 | 27,144
Net income attributable to Hawaiian Electric | 25,637 | 27,144
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 25,367 | 26,874
HELCO |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 73,183 | 88,055
Operating expenses |  |
Fuel oil | 14,374 | 23,385
Purchased power | 16,797 | 21,893
Other operation and maintenance | 16,441 | 16,399
Depreciation | 9,449 | 9,313
Taxes, other than income taxes | 6,891 | 8,384
Total expenses | 63,952 | 79,374
Total operating income | 9,231 | 8,681
Other income |  |
Allowance for equity funds used during construction | 127 | 145
Interest and other charges |  |
Interest expense and other charges, net | (2,965) | (2,680)
Allowance for borrowed funds used during construction | 49 | 53
Income before income taxes | 6,442 | 6,199
Income taxes | 2,346 | 2,277
Net income | 4,096 | 3,922
Preferred stock dividends of subsidiaries | 134 | 134
Net income attributable to Hawaiian Electric | 3,962 | 3,788
Net income for common stock | 3,962 | 3,788
Maui Electric |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 71,706 | 85,674
Operating expenses |  |
Fuel oil | 25,281 | 35,018
Purchased power | 7,145 | 10,864
Other operation and maintenance | 17,909 | 17,519
Depreciation | 5,810 | 5,541
Taxes, other than income taxes | 6,863 | 8,163
Total expenses | 63,008 | 77,105
Total operating income | 8,698 | 8,569
Other income |  |
Allowance for equity funds used during construction | 206 | 145
Interest and other charges |  |
Interest expense and other charges, net | (2,490) | (2,435)
Allowance for borrowed funds used during construction | 84 | 58
Income before income taxes | 6,498 | 6,337
Income taxes | 2,436 | 2,338
Net income | 4,062 | 3,999
Preferred stock dividends of subsidiaries | 95 | 95
Net income attributable to Hawaiian Electric | 3,967 | 3,904
Net income for common stock | 3,967 | 3,904
Other subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 0 | 0
Operating expenses |  |
Other operation and maintenance | 0 | 0
Total expenses | 0 | 0
Total 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 |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (12) | (28)
Operating expenses |  |
Total operating income | (12) | (28)
Other income |  |
Equity in earnings of subsidiaries | (7,929) | (7,692)
Interest and other charges |  |
Interest expense and other charges, net | 12 | 28
Income before income taxes | (7,929) | (7,692)
Income taxes | 0 | 0
Net income | (7,929) | (7,692)
Net income attributable to Hawaiian Electric | (7,929) | (7,692)
Net income for common stock | (7,929) | (7,692)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 482,052 | 573,442
Operating expenses |  |
Fuel oil | 113,740 | 176,806
Purchased power | 115,859 | 136,007
Other operation and maintenance | 103,908 | 104,002
Depreciation | 46,781 | 44,243
Taxes, other than income taxes | 46,438 | 54,748
Total expenses | 426,726 | 515,806
Total operating income | 55,326 | 57,636
Other income |  |
Allowance for equity funds used during construction | 1,739 | 1,413
Interest and other charges |  |
Interest expense and other charges, net | (17,308) | (16,325)
Allowance for borrowed funds used during construction | 662 | 499
Income before income taxes | 40,419 | 43,223
Income taxes | 14,553 | 15,850
Net income | 25,866 | 27,373
Preferred stock dividends of subsidiaries | 229 | 229
Net income attributable to Hawaiian Electric | 25,637 | 27,144
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | $ 25,367 | $ 26,874

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