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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |
Revenues | $ 661,615 | $ 645,874
Expenses |  |
Purchased power | 134,000 | 140,000
Total expenses | 583,678 | 573,985
Total operating income | 77,937 | 71,889
Allowance for equity funds used during construction | 2,910 | 3,294
Retirement defined benefits expense—other than service costs | (763) | (1,833)
Allowance for borrowed funds used during construction | 1,078 | 1,444
Income before income taxes | 58,039 | 53,276
Income taxes | 11,878 | 12,556
Net income | 46,161 | 40,720
Preferred stock dividends of subsidiaries | 473 | 473
Net income for common stock | 45,688 | 40,247
Consolidating adjustments |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (32) | (42)
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 | (32) | (42)
Allowance for equity funds used during construction | 0 | 0
Equity in earnings of subsidiaries | (11,849) | (9,325)
Retirement defined benefits expense—other than service costs | 0 | 0
Interest expense and other charges, net | 32 | 42
Allowance for borrowed funds used during construction | 0 | 0
Income before income taxes | (11,849) | (9,325)
Income taxes | 0 | 0
Net income | (11,849) | (9,325)
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | (11,849) | (9,325)
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | (11,849) | (9,325)
Hawaiian Electric (parent only) | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 405,669 | 401,180
Expenses |  |
Fuel oil | 108,922 | 114,498
Purchased power | 105,223 | 107,370
Other operation and maintenance | 81,178 | 72,940
Depreciation | 35,867 | 34,439
Taxes, other than income taxes | 38,631 | 38,167
Total expenses | 369,821 | 367,414
Total operating income | 35,848 | 33,766
Allowance for equity funds used during construction | 2,447 | 2,887
Equity in earnings of subsidiaries | 11,849 | 9,325
Retirement defined benefits expense—other than service costs | (567) | (1,062)
Interest expense and other charges, net | (12,800) | (12,495)
Allowance for borrowed funds used during construction | 902 | 1,238
Income before income taxes | 37,679 | 33,659
Income taxes | 5,283 | 5,914
Net income | 32,396 | 27,745
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | 32,396 | 27,745
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 32,126 | 27,475
HELCO | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 87,205 | 87,933
Expenses |  |
Fuel oil | 20,842 | 18,487
Purchased power | 19,177 | 23,834
Other operation and maintenance | 18,736 | 16,098
Depreciation | 10,453 | 10,055
Taxes, other than income taxes | 8,105 | 8,212
Total expenses | 77,313 | 76,686
Total operating income | 9,892 | 11,247
Allowance for equity funds used during construction | 132 | 111
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (106) | (103)
Interest expense and other charges, net | (2,901) | (2,907)
Allowance for borrowed funds used during construction | 56 | 64
Income before income taxes | 7,073 | 8,412
Income taxes | 1,770 | 2,177
Net income | 5,303 | 6,235
Preferred stock dividends of subsidiaries | 134 | 134
Net income attributable to Hawaiian Electric | 5,169 | 6,101
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 5,169 | 6,101
Maui Electric | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 85,653 | 81,356
Expenses |  |
Fuel oil | 30,845 | 33,983
Purchased power | 10,045 | 8,706
Other operation and maintenance | 18,216 | 18,572
Depreciation | 7,627 | 5,972
Taxes, other than income taxes | 8,068 | 7,725
Total expenses | 74,801 | 74,958
Total operating income | 10,852 | 6,398
Allowance for equity funds used during construction | 331 | 296
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (30) | (99)
Interest expense and other charges, net | (2,317) | (2,334)
Allowance for borrowed funds used during construction | 120 | 142
Income before income taxes | 8,956 | 4,403
Income taxes | 2,181 | 1,084
Net income | 6,775 | 3,319
Preferred stock dividends of subsidiaries | 95 | 95
Net income attributable to Hawaiian Electric | 6,680 | 3,224
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 6,680 | 3,224
Other subsidiaries | Reportable Legal Entities |  |
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
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 578,495 | 570,427
Expenses |  |
Fuel oil | 160,609 | 166,968
Purchased power | 134,445 | 139,910
Other operation and maintenance | 118,130 | 107,610
Depreciation | 53,947 | 50,466
Taxes, other than income taxes | 54,804 | 54,104
Total expenses | 521,935 | 519,058
Total operating income | 56,560 | 51,369
Allowance for equity funds used during construction | 2,910 | 3,294
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits expense—other than service costs | (703) | (1,264)
Interest expense and other charges, net | (17,986) | (17,694)
Allowance for borrowed funds used during construction | 1,078 | 1,444
Income before income taxes | 41,859 | 37,149
Income taxes | 9,234 | 9,175
Net income | 32,625 | 27,974
Preferred stock dividends of subsidiaries | 229 | 229
Net income attributable to Hawaiian Electric | 32,396 | 27,745
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | $ 32,126 | $ 27,475

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