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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Condensed Income Statements, Captions [Line Items] |  |
Revenues | $ 928,237 | $ 785,068
Expenses |  |
Total expenses | 834,719 | 685,792
Total operating income | 93,518 | 99,276
Allowance for equity funds used during construction | 3,301 | 2,409
Retirement defined benefits credit (expense)—other than service costs | 1,152 | 1,243
Allowance for borrowed funds used during construction | 1,131 | 778
Income before income taxes | 70,304 | 87,480
Income taxes | 15,110 | 17,840
Net income attributable to Hawaiian Electric | 55,194 | 69,640
Preferred stock dividends of Hawaiian Electric | 473 | 473
Net income for common stock | 54,721 | 69,167
Hawaiian Electric Consolidated |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 830,361 | 708,792
Expenses |  |
Fuel oil | 334,097 | 221,286
Purchased power | 152,761 | 163,533
Other operation and maintenance | 128,316 | 125,257
Depreciation | 60,927 | 58,471
Taxes, other than income taxes | 78,385 | 66,650
Total expenses | 754,486 | 635,197
Total operating income | 75,875 | 73,595
Allowance for equity funds used during construction | 3,301 | 2,409
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 1,047 | 990
Interest expense and other charges, net | (20,246) | (18,326)
Allowance for borrowed funds used during construction | 1,131 | 778
Income before income taxes | 61,108 | 59,446
Income taxes | 13,600 | 12,538
Net income | 47,508 | 46,908
Preferred stock dividends of subsidiaries | 229 | 229
Net income attributable to Hawaiian Electric | 47,279 | 46,679
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 47,009 | 46,409
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric (parent only) |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 601,530 | 500,242
Expenses |  |
Fuel oil | 253,827 | 154,425
Purchased power | 110,279 | 124,183
Other operation and maintenance | 83,233 | 83,656
Depreciation | 41,038 | 39,484
Taxes, other than income taxes | 56,953 | 47,274
Total expenses | 545,330 | 449,022
Total operating income | 56,200 | 51,220
Allowance for equity funds used during construction | 2,640 | 1,990
Equity in earnings of subsidiaries | 11,541 | 13,661
Retirement defined benefits credit (expense)—other than service costs | 904 | 855
Interest expense and other charges, net | (14,557) | (13,093)
Allowance for borrowed funds used during construction | 918 | 651
Income before income taxes | 57,646 | 55,284
Income taxes | 10,367 | 8,605
Net income | 47,279 | 46,679
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | 47,279 | 46,679
Preferred stock dividends of Hawaiian Electric | 270 | 270
Net income for common stock | 47,009 | 46,409
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 115,288 | 108,528
Expenses |  |
Fuel oil | 27,760 | 25,251
Purchased power | 34,086 | 30,712
Other operation and maintenance | 21,350 | 20,214
Depreciation | 10,635 | 10,351
Taxes, other than income taxes | 10,737 | 10,032
Total expenses | 104,568 | 96,560
Total operating income | 10,720 | 11,968
Allowance for equity funds used during construction | 284 | 193
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 169 | 167
Interest expense and other charges, net | (2,831) | (2,609)
Allowance for borrowed funds used during construction | 91 | 60
Income before income taxes | 8,433 | 9,779
Income taxes | 1,909 | 2,268
Net income | 6,524 | 7,511
Preferred stock dividends of subsidiaries | 134 | 134
Net income attributable to Hawaiian Electric | 6,390 | 7,377
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 6,390 | 7,377
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | 113,673 | 100,028
Expenses |  |
Fuel oil | 52,510 | 41,610
Purchased power | 8,396 | 8,638
Other operation and maintenance | 23,733 | 21,387
Depreciation | 9,254 | 8,636
Taxes, other than income taxes | 10,695 | 9,344
Total expenses | 104,588 | 89,615
Total operating income | 9,085 | 10,413
Allowance for equity funds used during construction | 377 | 226
Equity in earnings of subsidiaries | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | (26) | (32)
Interest expense and other charges, net | (2,988) | (2,630)
Allowance for borrowed funds used during construction | 122 | 67
Income before income taxes | 6,570 | 8,044
Income taxes | 1,324 | 1,665
Net income | 5,246 | 6,379
Preferred stock dividends of subsidiaries | 95 | 95
Net income attributable to Hawaiian Electric | 5,151 | 6,284
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | 5,151 | 6,284
Hawaiian Electric Consolidated | Reportable Legal Entities | 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 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 | 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 | Consolidating adjustments |  |
Condensed Income Statements, Captions [Line Items] |  |
Revenues | (130) | (6)
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 | (130) | (6)
Allowance for equity funds used during construction | 0 | 0
Equity in earnings of subsidiaries | (11,541) | (13,661)
Retirement defined benefits credit (expense)—other than service costs | 0 | 0
Interest expense and other charges, net | 130 | 6
Allowance for borrowed funds used during construction | 0 | 0
Income before income taxes | (11,541) | (13,661)
Income taxes | 0 | 0
Net income | (11,541) | (13,661)
Preferred stock dividends of subsidiaries | 0 | 0
Net income attributable to Hawaiian Electric | (11,541) | (13,661)
Preferred stock dividends of Hawaiian Electric | 0 | 0
Net income for common stock | $ (11,541) | $ (13,661)

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