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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |
Revenues | $ 645,874 | $ 591,562
Expenses |  |
Purchased power | 140,000 | 127,000
Total expenses | 573,985 | 521,824
Total operating income | 71,889 | 69,738
Allowance for equity funds used during construction | 3,294 | 2,399
Retirement defined benefits expense—other than service costs | (1,833) | (1,876)
Allowance for borrowed funds used during construction | 1,444 | 889
Income before income taxes | 53,276 | 51,582
Income taxes | 12,556 | 16,916
Net income | 40,720 | 34,666
Preferred stock dividends of subsidiaries | 473 | 473
Net income for common stock | 40,247 | 34,193
Hawaiian Electric Company |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 401,180 | 362,843
Expenses |  |
Fuel oil | 114,498 | 98,001
Purchased power | 107,370 | 100,147
Other operation and maintenance | 72,940 | 65,993
Depreciation | 34,439 | 32,722
Taxes, other than income taxes | 38,167 | 35,040
Total expenses | 367,414 | 331,903
Total operating income | 33,766 | 30,940
Allowance for equity funds used during construction | 2,887 | 2,056
Equity in earnings of subsidiaries | 9,325 | 8,603
Retirement defined benefits expense—other than service costs | (1,062) | (1,285)
Interest expense and other charges, net | (12,495) | (12,057)
Allowance for borrowed funds used during construction | 1,238 | 749
Income before income taxes | 33,659 | 29,006
Income taxes | 5,914 | 7,271
Net income | 27,745 | 21,735
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | 27,745 | 21,735
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 27,475 | 21,465
HELCO |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 87,933 | 78,982
Expenses |  |
Fuel oil | 18,487 | 17,257
Purchased power | 23,834 | 18,589
Other operation and maintenance | 16,098 | 15,599
Depreciation | 10,055 | 9,685
Taxes, other than income taxes | 8,212 | 7,450
Total expenses | 76,686 | 68,580
Total operating income | 11,247 | 10,402
Allowance for equity funds used during construction | 111 | 115
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (103) | 83
Interest expense and other charges, net | (2,907) | (3,004)
Allowance for borrowed funds used during construction | 64 | 45
Income before income taxes | 8,412 | 7,641
Income taxes | 2,177 | 2,923
Net income | 6,235 | 4,718
Preferred stock dividends of subsidiaries | 134 | 134
Net income attributable to Hawaiian Electric | 6,101 | 4,584
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 6,101 | 4,584
Maui Electric |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 81,356 | 76,793
Expenses |  |
Fuel oil | 33,983 | 29,012
Purchased power | 8,706 | 8,388
Other operation and maintenance | 18,572 | 17,225
Depreciation | 5,972 | 5,809
Taxes, other than income taxes | 7,725 | 7,333
Total expenses | 74,958 | 67,767
Total operating income | 6,398 | 9,026
Allowance for equity funds used during construction | 296 | 228
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (99) | (221)
Interest expense and other charges, net | (2,334) | (2,450)
Allowance for borrowed funds used during construction | 142 | 95
Income before income taxes | 4,403 | 6,678
Income taxes | 1,084 | 2,564
Net income | 3,319 | 4,114
Preferred stock dividends of subsidiaries | 95 | 95
Net income attributable to Hawaiian Electric | 3,224 | 4,019
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 3,224 | 4,019
Other subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 0 | 0
Expenses |  |
Fuel oil | 0 | 0
Purchased power | 0 | 0
Other operation and maintenance | 0 | 0
Depreciation | 0 | 0
Taxes, other than income taxes | 0 | 0
Total expenses | 0 | 0
Total operating income | 0 | 0
Allowance for equity funds used during construction | 0 | 0
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | 0 | 0
Interest expense and other charges, net | 0 | 0
Allowance for borrowed funds used during construction | 0 | 0
Income before income taxes | 0 | 0
Income taxes | 0 | 0
Net income | 0 | 0
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | 0 | 0
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 0 | 0
Consolidating adjustments |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (42) | (7)
Expenses |  |
Fuel oil | 0 | 0
Purchased power | 0 | 0
Other operation and maintenance | 0 | 0
Depreciation | 0 | 0
Taxes, other than income taxes | 0 | 0
Total expenses | 0 | 0
Total operating income | (42) | (7)
Allowance for equity funds used during construction | 0 | 0
Equity in earnings of subsidiaries | (9,325) | (8,603)
Retirement defined benefits expense—other than service costs | 0 | 0
Interest expense and other charges, net | 42 | 7
Allowance for borrowed funds used during construction | 0 | 0
Income before income taxes | (9,325) | (8,603)
Income taxes | 0 | 0
Net income | (9,325) | (8,603)
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | (9,325) | (8,603)
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | (9,325) | (8,603)
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 570,427 | 518,611
Expenses |  |
Fuel oil | 166,968 | 144,270
Purchased power | 139,910 | 127,124
Other operation and maintenance | 107,610 | 98,817
Depreciation | 50,466 | 48,216
Taxes, other than income taxes | 54,104 | 49,823
Total expenses | 519,058 | 468,250
Total operating income | 51,369 | 50,361
Allowance for equity funds used during construction | 3,294 | 2,399
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (1,264) | (1,423)
Interest expense and other charges, net | (17,694) | (17,504)
Allowance for borrowed funds used during construction | 1,444 | 889
Income before income taxes | 37,149 | 34,722
Income taxes | 9,175 | 12,758
Net income | 27,974 | 21,964
Preferred stock dividends of subsidiaries | 229 | 229
Net income attributable to Hawaiian Electric | 27,745 | 21,735
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | $ 27,475 | $ 21,465

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