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Electric utility segment - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | $ 895,685 |  | $ 895,607 |  | $ 1,823,922 | $ 1,680,675
Expenses |  |  |  |  |  |
Total expenses | 802,706 |  | 808,939 |  | 1,637,425 | 1,494,731
Operating income - bank | 92,979 |  | 86,668 |  | 186,497 | 185,944
Allowance for equity funds used during construction | 3,772 |  | 2,470 |  | 7,073 | 4,879
Retirement defined benefits credit (expense)—other than service costs | 1,153 |  | 1,246 |  | 2,305 | 2,489
Allowance for borrowed funds used during construction | 1,295 |  | 798 |  | 2,426 | 1,576
Income before income taxes | 69,367 |  | 66,217 |  | 139,671 | 153,697
Income taxes | 14,284 |  | 13,203 |  | 29,394 | 31,043
Net income attributable to Hawaiian Electric | 55,083 |  | 53,014 |  | 110,277 | 122,654
Preferred stock dividends of Hawaiian Electric | 473 |  | 473 |  | 946 | 946
Net income for common stock | 54,610 | $ 54,721 | 52,541 | $ 69,167 | 109,331 | 121,708
Hawaiian Electric Consolidated |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 794,191 |  | 818,873 |  | 1,624,552 | 1,527,665
Expenses |  |  |  |  |  |
Fuel oil | 280,157 |  | 269,655 |  | 614,254 | 490,941
Purchased power | 168,434 |  | 218,085 |  | 321,195 | 381,618
Other operation and maintenance | 136,360 |  | 124,892 |  | 264,676 | 250,149
Depreciation | 60,689 |  | 58,739 |  | 121,616 | 117,210
Taxes, other than income taxes | 74,926 |  | 76,348 |  | 153,311 | 142,998
Total expenses | 720,566 |  | 747,719 |  | 1,475,052 | 1,382,916
Operating income - bank | 73,625 |  | 71,154 |  | 149,500 | 144,749
Allowance for equity funds used during construction | 3,772 |  | 2,470 |  | 7,073 | 4,879
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 1,048 |  | 991 |  | 2,095 | 1,981
Interest expense and other charges, net | (20,872) |  | (18,800) |  | (41,118) | (37,126)
Allowance for borrowed funds used during construction | 1,295 |  | 798 |  | 2,426 | 1,576
Income before income taxes | 58,868 |  | 56,613 |  | 119,976 | 116,059
Income taxes | 13,070 |  | 11,979 |  | 26,670 | 24,517
Net income | 45,798 |  | 44,634 |  | 93,306 | 91,542
Preferred stock dividends of subsidiaries | 229 |  | 229 |  | 458 | 458
Net income attributable to Hawaiian Electric | 45,569 |  | 44,405 |  | 92,848 | 91,084
Preferred stock dividends of Hawaiian Electric | 270 |  | 270 |  | 540 | 540
Net income for common stock | 45,299 | $ 47,009 | 44,135 | $ 46,409 | 92,308 | 90,544
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 570,689 |  | 576,472 |  | 1,172,219 | 1,076,714
Expenses |  |  |  |  |  |
Fuel oil | 213,471 |  | 184,297 |  | 467,298 | 338,722
Purchased power | 119,460 |  | 165,202 |  | 229,739 | 289,385
Other operation and maintenance | 88,967 |  | 82,707 |  | 172,200 | 166,363
Depreciation | 40,800 |  | 39,501 |  | 81,838 | 78,985
Taxes, other than income taxes | 54,046 |  | 54,025 |  | 110,999 | 101,299
Total expenses | 516,744 |  | 525,732 |  | 1,062,074 | 974,754
Operating income - bank | 53,945 |  | 50,740 |  | 110,145 | 101,960
Allowance for equity funds used during construction | 2,959 |  | 1,946 |  | 5,599 | 3,936
Equity in earnings of subsidiaries | 11,414 |  | 12,237 |  | 22,955 | 25,898
Retirement defined benefits credit (expense)—other than service costs | 905 |  | 856 |  | 1,809 | 1,711
Interest expense and other charges, net | (14,742) |  | (13,519) |  | (29,299) | (26,612)
Allowance for borrowed funds used during construction | 1,030 |  | 637 |  | 1,948 | 1,288
Income before income taxes | 55,511 |  | 52,897 |  | 113,157 | 108,181
Income taxes | 9,942 |  | 8,492 |  | 20,309 | 17,097
Net income | 45,569 |  | 44,405 |  | 92,848 | 91,084
Preferred stock dividends of subsidiaries | 0 |  | 0 |  | 0 | 0
Net income attributable to Hawaiian Electric | 45,569 |  | 44,405 |  | 92,848 | 91,084
Preferred stock dividends of Hawaiian Electric | 270 |  | 270 |  | 540 | 540
Net income for common stock | 45,299 |  | 44,135 |  | 92,308 | 90,544
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 112,074 |  | 124,502 |  | 227,362 | 233,030
Expenses |  |  |  |  |  |
Fuel oil | 20,471 |  | 33,065 |  | 48,231 | 58,316
Purchased power | 37,246 |  | 38,735 |  | 71,332 | 69,447
Other operation and maintenance | 21,666 |  | 21,331 |  | 43,016 | 41,545
Depreciation | 10,636 |  | 10,352 |  | 21,271 | 20,703
Taxes, other than income taxes | 10,389 |  | 11,378 |  | 21,126 | 21,410
Total expenses | 100,408 |  | 114,861 |  | 204,976 | 211,421
Operating income - bank | 11,666 |  | 9,641 |  | 22,386 | 21,609
Allowance for equity funds used during construction | 354 |  | 217 |  | 638 | 410
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 168 |  | 167 |  | 337 | 334
Interest expense and other charges, net | (2,975) |  | (2,642) |  | (5,806) | (5,251)
Allowance for borrowed funds used during construction | 113 |  | 67 |  | 204 | 127
Income before income taxes | 9,326 |  | 7,450 |  | 17,759 | 17,229
Income taxes | 2,118 |  | 1,659 |  | 4,027 | 3,927
Net income | 7,208 |  | 5,791 |  | 13,732 | 13,302
Preferred stock dividends of subsidiaries | 133 |  | 133 |  | 267 | 267
Net income attributable to Hawaiian Electric | 7,075 |  | 5,658 |  | 13,465 | 13,035
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | 7,075 |  | 5,658 |  | 13,465 | 13,035
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 111,428 |  | 117,928 |  | 225,101 | 217,956
Expenses |  |  |  |  |  |
Fuel oil | 46,215 |  | 52,293 |  | 98,725 | 93,903
Purchased power | 11,728 |  | 14,148 |  | 20,124 | 22,786
Other operation and maintenance | 25,727 |  | 20,854 |  | 49,460 | 42,241
Depreciation | 9,253 |  | 8,886 |  | 18,507 | 17,522
Taxes, other than income taxes | 10,491 |  | 10,945 |  | 21,186 | 20,289
Total expenses | 103,414 |  | 107,126 |  | 208,002 | 196,741
Operating income - bank | 8,014 |  | 10,802 |  | 17,099 | 21,215
Allowance for equity funds used during construction | 459 |  | 307 |  | 836 | 533
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | (25) |  | (32) |  | (51) | (64)
Interest expense and other charges, net | (3,155) |  | (2,668) |  | (6,143) | (5,298)
Allowance for borrowed funds used during construction | 152 |  | 94 |  | 274 | 161
Income before income taxes | 5,445 |  | 8,503 |  | 12,015 | 16,547
Income taxes | 1,010 |  | 1,828 |  | 2,334 | 3,493
Net income | 4,435 |  | 6,675 |  | 9,681 | 13,054
Preferred stock dividends of subsidiaries | 96 |  | 96 |  | 191 | 191
Net income attributable to Hawaiian Electric | 4,339 |  | 6,579 |  | 9,490 | 12,863
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | 4,339 |  | 6,579 |  | 9,490 | 12,863
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiary |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 | 0
Expenses |  |  |  |  |  |
Fuel oil | 0 |  | 0 |  | 0 | 0
Purchased power | 0 |  | 0 |  | 0 | 0
Other operation and maintenance | 0 |  | 0 |  | 0 | 0
Depreciation | 0 |  | 0 |  | 0 | 0
Taxes, other than income taxes | 0 |  | 0 |  | 0 | 0
Total expenses | 0 |  | 0 |  | 0 | 0
Operating income - bank | 0 |  | 0 |  | 0 | 0
Allowance for equity funds used during construction | 0 |  | 0 |  | 0 | 0
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 0 |  | 0 |  | 0 | 0
Interest expense and other charges, net | 0 |  | 0 |  | 0 | 0
Allowance for borrowed funds used during construction | 0 |  | 0 |  | 0 | 0
Income before income taxes | 0 |  | 0 |  | 0 | 0
Income taxes | 0 |  | 0 |  | 0 | 0
Net income | 0 |  | 0 |  | 0 | 0
Preferred stock dividends of subsidiaries | 0 |  | 0 |  | 0 | 0
Net income attributable to Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | 0 |  | 0 |  | 0 | 0
Hawaiian Electric Consolidated | Consolidating adjustments |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 0 |  | (29) |  | (130) | (35)
Expenses |  |  |  |  |  |
Fuel oil | 0 |  | 0 |  | 0 | 0
Purchased power | 0 |  | 0 |  | 0 | 0
Other operation and maintenance | 0 |  | 0 |  | 0 | 0
Depreciation | 0 |  | 0 |  | 0 | 0
Taxes, other than income taxes | 0 |  | 0 |  | 0 | 0
Total expenses | 0 |  | 0 |  | 0 | 0
Operating income - bank | 0 |  | (29) |  | (130) | (35)
Allowance for equity funds used during construction | 0 |  | 0 |  | 0 | 0
Equity in earnings of subsidiaries | (11,414) |  | (12,237) |  | (22,955) | (25,898)
Retirement defined benefits credit (expense)—other than service costs | 0 |  | 0 |  | 0 | 0
Interest expense and other charges, net | 0 |  | 29 |  | 130 | 35
Allowance for borrowed funds used during construction | 0 |  | 0 |  | 0 | 0
Income before income taxes | (11,414) |  | (12,237) |  | (22,955) | (25,898)
Income taxes | 0 |  | 0 |  | 0 | 0
Net income | (11,414) |  | (12,237) |  | (22,955) | (25,898)
Preferred stock dividends of subsidiaries | 0 |  | 0 |  | 0 | 0
Net income attributable to Hawaiian Electric | (11,414) |  | (12,237) |  | (22,955) | (25,898)
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | $ (11,414) |  | $ (12,237) |  | $ (22,955) | $ (25,898)

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