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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | $ 895,607 |  | $ 680,257 |  | $ 1,680,675 | $ 1,323,203
Expenses |  |  |  |  |  |
Total expenses | 808,939 |  | 578,401 |  | 1,494,731 | 1,123,316
Total operating income | 86,668 |  | 101,856 |  | 185,944 | 199,887
Allowance for equity funds used during construction | 2,470 |  | 2,377 |  | 4,879 | 4,568
Retirement defined benefits credit—other than service costs | 1,246 |  | 1,216 |  | 2,489 | 3,651
Allowance for borrowed funds used during construction | 798 |  | 812 |  | 1,576 | 1,559
Income before income taxes | 66,217 |  | 82,944 |  | 153,697 | 163,140
Income taxes | 13,203 |  | 18,599 |  | 31,043 | 33,964
Net income attributable to Hawaiian Electric | 53,014 |  | 64,345 |  | 122,654 | 129,176
Preferred stock dividends of Hawaiian Electric | 473 |  | 473 |  | 946 | 946
Net income for common stock | 52,541 | $ 69,167 | 63,872 | $ 64,358 | 121,708 | 128,230
Consolidating adjustments |  |  |  |  |  |
Expenses |  |  |  |  |  |
Total expenses |  |  | 0 |  |  |
Hawaiian Electric Consolidated |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 818,873 |  | 601,879 |  | 1,527,665 | 1,166,743
Expenses |  |  |  |  |  |
Fuel oil | 269,655 |  | 139,136 |  | 490,941 | 266,563
Purchased power | 218,085 |  | 162,465 |  | 381,618 | 304,761
Other operation and maintenance | 124,892 |  | 118,142 |  | 250,149 | 232,712
Depreciation | 58,739 |  | 57,381 |  | 117,210 | 114,736
Taxes, other than income taxes | 76,348 |  | 57,071 |  | 142,998 | 111,173
Total expenses | 747,719 |  | 534,195 |  | 1,382,916 | 1,029,945
Total operating income | 71,154 |  | 67,684 |  | 144,749 | 136,798
Allowance for equity funds used during construction | 2,470 |  | 2,377 |  | 4,879 | 4,568
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit—other than service costs | 991 |  | 1,020 |  | 1,981 | 2,041
Interest expense and other charges, net | (18,800) |  | (17,995) |  | (37,126) | (35,978)
Allowance for borrowed funds used during construction | 798 |  | 812 |  | 1,576 | 1,559
Income before income taxes | 56,613 |  | 53,898 |  | 116,059 | 108,988
Income taxes | 11,979 |  | 11,498 |  | 24,517 | 22,731
Net income | 44,634 |  | 42,400 |  | 91,542 | 86,257
Preferred stock dividends of subsidiaries | 229 |  | 229 |  | 458 | 458
Net income attributable to Hawaiian Electric | 44,405 |  | 42,171 |  | 91,084 | 85,799
Preferred stock dividends of Hawaiian Electric | 270 |  | 270 |  | 540 | 540
Net income for common stock | 44,135 | $ 46,409 | 41,901 | $ 43,358 | 90,544 | 85,259
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 576,472 |  | 422,697 |  | 1,076,714 | 823,251
Expenses |  |  |  |  |  |
Fuel oil | 184,297 |  | 91,345 |  | 338,722 | 180,073
Purchased power | 165,202 |  | 124,948 |  | 289,385 | 233,552
Other operation and maintenance | 82,707 |  | 77,903 |  | 166,363 | 155,238
Depreciation | 39,501 |  | 38,907 |  | 78,985 | 77,821
Taxes, other than income taxes | 54,025 |  | 40,301 |  | 101,299 | 78,928
Total expenses | 525,732 |  | 373,404 |  | 974,754 | 725,612
Total operating income | 50,740 |  | 49,293 |  | 101,960 | 97,639
Allowance for equity funds used during construction | 1,946 |  | 1,930 |  | 3,936 | 3,678
Equity in earnings of subsidiaries | 12,237 |  | 10,744 |  | 25,898 | 23,254
Retirement defined benefits credit—other than service costs | 856 |  | 884 |  | 1,711 | 1,770
Interest expense and other charges, net | (13,519) |  | (12,829) |  | (26,612) | (25,661)
Allowance for borrowed funds used during construction | 637 |  | 654 |  | 1,288 | 1,245
Income before income taxes | 52,897 |  | 50,676 |  | 108,181 | 101,925
Income taxes | 8,492 |  | 8,505 |  | 17,097 | 16,126
Net income | 44,405 |  | 42,171 |  | 91,084 | 85,799
Preferred stock dividends of subsidiaries | 0 |  | 0 |  | 0 | 0
Net income attributable to Hawaiian Electric | 44,405 |  | 42,171 |  | 91,084 | 85,799
Preferred stock dividends of Hawaiian Electric | 270 |  | 270 |  | 540 | 540
Net income for common stock | 44,135 |  | 41,901 |  | 90,544 | 85,259
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 124,502 |  | 91,512 |  | 233,030 | 176,661
Expenses |  |  |  |  |  |
Fuel oil | 33,065 |  | 19,586 |  | 58,316 | 36,071
Purchased power | 38,735 |  | 24,236 |  | 69,447 | 45,833
Other operation and maintenance | 21,331 |  | 19,474 |  | 41,545 | 37,386
Depreciation | 10,352 |  | 10,053 |  | 20,703 | 20,101
Taxes, other than income taxes | 11,378 |  | 8,539 |  | 21,410 | 16,532
Total expenses | 114,861 |  | 81,888 |  | 211,421 | 155,923
Total operating income | 9,641 |  | 9,624 |  | 21,609 | 20,738
Allowance for equity funds used during construction | 217 |  | 140 |  | 410 | 272
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit—other than service costs | 167 |  | 169 |  | 334 | 337
Interest expense and other charges, net | (2,642) |  | (2,573) |  | (5,251) | (5,154)
Allowance for borrowed funds used during construction | 67 |  | 48 |  | 127 | 92
Income before income taxes | 7,450 |  | 7,408 |  | 17,229 | 16,285
Income taxes | 1,659 |  | 1,668 |  | 3,927 | 3,719
Net income | 5,791 |  | 5,740 |  | 13,302 | 12,566
Preferred stock dividends of subsidiaries | 133 |  | 133 |  | 267 | 267
Net income attributable to Hawaiian Electric | 5,658 |  | 5,607 |  | 13,035 | 12,299
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | 5,658 |  | 5,607 |  | 13,035 | 12,299
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Revenues | 117,928 |  | 87,670 |  | 217,956 | 166,851
Expenses |  |  |  |  |  |
Fuel oil | 52,293 |  | 28,205 |  | 93,903 | 50,419
Purchased power | 14,148 |  | 13,281 |  | 22,786 | 25,376
Other operation and maintenance | 20,854 |  | 20,765 |  | 42,241 | 40,088
Depreciation | 8,886 |  | 8,421 |  | 17,522 | 16,814
Taxes, other than income taxes | 10,945 |  | 8,231 |  | 20,289 | 15,713
Total expenses | 107,126 |  | 78,903 |  | 196,741 | 148,410
Total operating income | 10,802 |  | 8,767 |  | 21,215 | 18,441
Allowance for equity funds used during construction | 307 |  | 307 |  | 533 | 618
Equity in earnings of subsidiaries | 0 |  | 0 |  | 0 | 0
Retirement defined benefits credit—other than service costs | (32) |  | (33) |  | (64) | (66)
Interest expense and other charges, net | (2,668) |  | (2,593) |  | (5,298) | (5,183)
Allowance for borrowed funds used during construction | 94 |  | 110 |  | 161 | 222
Income before income taxes | 8,503 |  | 6,558 |  | 16,547 | 14,032
Income taxes | 1,828 |  | 1,325 |  | 3,493 | 2,886
Net income | 6,675 |  | 5,233 |  | 13,054 | 11,146
Preferred stock dividends of subsidiaries | 96 |  | 96 |  | 191 | 191
Net income attributable to Hawaiian Electric | 6,579 |  | 5,137 |  | 12,863 | 10,955
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | 6,579 |  | 5,137 |  | 12,863 | 10,955
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries |  |  |  |  |  |
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
Total operating income | 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—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 | (29) |  | 0 |  | (35) | (20)
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
Total operating income | (29) |  | 0 |  | (35) | (20)
Allowance for equity funds used during construction | 0 |  | 0 |  | 0 | 0
Equity in earnings of subsidiaries | (12,237) |  | (10,744) |  | (25,898) | (23,254)
Retirement defined benefits credit—other than service costs | 0 |  | 0 |  | 0 | 0
Interest expense and other charges, net | 29 |  | 0 |  | 35 | 20
Allowance for borrowed funds used during construction | 0 |  | 0 |  | 0 | 0
Income before income taxes | (12,237) |  | (10,744) |  | (25,898) | (23,254)
Income taxes | 0 |  | 0 |  | 0 | 0
Net income | (12,237) |  | (10,744) |  | (25,898) | (23,254)
Preferred stock dividends of subsidiaries | 0 |  | 0 |  | 0 | 0
Net income attributable to Hawaiian Electric | (12,237) |  | (10,744) |  | (25,898) | (23,254)
Preferred stock dividends of Hawaiian Electric | 0 |  | 0 |  | 0 | 0
Net income for common stock | $ (12,237) |  | $ (10,744) |  | $ (25,898) | $ (23,254)

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