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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Condensed Income Statements, Captions [Line Items] |  |
Revenues | $ 642,946 | $ 677,186
Expenses |  |
Total expenses | 544,915 | 617,484
Total operating income | 98,031 | 59,702
Allowance for equity funds used during construction | 2,191 | 2,015
Retirement defined benefits credit (expense)—other than service costs | 2,435 | (934)
Allowance for borrowed funds used during construction | 747 | 688
Income before income taxes | 80,196 | 39,696
Income taxes | 15,365 | 5,803
Net income | 64,831 | 33,893
Preferred stock dividends of subsidiaries | 473 | 473
Net income for common stock | 64,358 | 33,420
Consolidating adjustments |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (20) | (215)
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 | (20) | (215)
Allowance for equity funds used during construction | 0 | 0
Equity in earnings of subsidiaries | (12,510) | (8,804)
Retirement defined benefits credit (expense)—other than service costs | 0 | 0
Interest expense and other charges, net | 20 | 215
Allowance for borrowed funds used during construction | 0 | 0
Income before income taxes | (12,510) | (8,804)
Income taxes | 0 |
Net income | (12,510) | (8,804)
Preferred stock dividends of subsidiaries | 0 |
Net income attributable to Hawaiian Electric | (12,510) | (8,804)
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | (12,510) | (8,804)
Hawaiian Electric (parent only) |  |
Expenses |  |
Purchased power | 142,000 | 140,000
Hawaiian Electric (parent only) | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 400,554 | 421,166
Expenses |  |
Fuel oil | 88,728 | 120,535
Purchased power | 108,604 | 107,951
Other operation and maintenance | 77,335 | 85,637
Depreciation | 38,914 | 38,011
Taxes, other than income taxes | 38,627 | 40,501
Total expenses | 352,208 | 392,635
Total operating income | 48,346 | 28,531
Allowance for equity funds used during construction | 1,748 | 1,743
Equity in earnings of subsidiaries | 12,510 | 8,804
Retirement defined benefits credit (expense)—other than service costs | 886 | (546)
Interest expense and other charges, net | (12,832) | (12,002)
Allowance for borrowed funds used during construction | 591 | 602
Income before income taxes | 51,249 | 27,132
Income taxes | 7,621 | 2,957
Net income | 43,628 | 24,175
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | 43,628 | 24,175
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 43,358 | 23,905
Hawaii Electric Light | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 85,149 | 89,293
Expenses |  |
Fuel oil | 16,485 | 22,432
Purchased power | 21,597 | 19,521
Other operation and maintenance | 17,912 | 19,104
Depreciation | 10,048 | 9,760
Taxes, other than income taxes | 7,993 | 8,342
Total expenses | 74,035 | 79,159
Total operating income | 11,114 | 10,134
Allowance for equity funds used during construction | 132 | 119
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 168 | 194
Interest expense and other charges, net | (2,581) | (2,484)
Allowance for borrowed funds used during construction | 44 | 36
Income before income taxes | 8,877 | 7,999
Income taxes | 2,051 | 1,798
Net income | 6,826 | 6,201
Preferred stock dividends of subsidiaries | 134 | 134
Net income attributable to Hawaiian Electric | 6,692 | 6,067
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 6,692 | 6,067
Maui Electric | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 79,181 | 87,198
Expenses |  |
Fuel oil | 22,214 | 30,254
Purchased power | 12,095 | 12,344
Other operation and maintenance | 19,323 | 22,806
Depreciation | 8,393 | 8,079
Taxes, other than income taxes | 7,482 | 8,207
Total expenses | 69,507 | 81,690
Total operating income | 9,674 | 5,508
Allowance for equity funds used during construction | 311 | 153
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | (33) | (29)
Interest expense and other charges, net | (2,590) | (2,323)
Allowance for borrowed funds used during construction | 112 | 50
Income before income taxes | 7,474 | 3,359
Income taxes | 1,561 | 527
Net income | 5,913 | 2,832
Preferred stock dividends of subsidiaries | 95 | 95
Net income attributable to Hawaiian Electric | 5,818 | 2,737
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 5,818 | 2,737
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 credit (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 |
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 Consolidated |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 564,864 | 597,442
Expenses |  |
Fuel oil | 127,427 | 173,221
Purchased power | 142,296 | 139,816
Other operation and maintenance | 114,570 | 127,547
Depreciation | 57,355 | 55,850
Taxes, other than income taxes | 54,102 | 57,050
Total expenses | 495,750 | 553,484
Total operating income | 69,114 | 43,958
Allowance for equity funds used during construction | 2,191 | 2,015
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 1,021 | (381)
Interest expense and other charges, net | (17,983) | (16,594)
Allowance for borrowed funds used during construction | 747 | 688
Income before income taxes | 55,090 | 29,686
Income taxes | 11,233 | 5,282
Net income | 43,857 | 24,404
Preferred stock dividends of subsidiaries | 229 | 229
Net income attributable to Hawaiian Electric | 43,628 | 24,175
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | $ 43,358 | $ 23,905

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