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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 756,904 |  |  | $ 641,427 |  |  | $ 2,080,107 | $ 1,927,558
Expenses |  |  |  |  |  |  |  |
Total expenses | 659,588 |  |  | 541,866 |  |  | 1,782,904 | 1,696,739
Total operating income | 97,316 |  |  | 99,561 |  |  | 297,203 | 230,819
Allowance for equity funds used during construction | 2,427 |  |  | 2,347 |  |  | 6,995 | 6,556
Retirement defined benefits credit (expense)—other than service costs | 1,058 |  |  | (1,102) |  |  | 4,709 | (2,970)
Allowance for borrowed funds used during construction | 827 |  |  | 801 |  |  | 2,386 | 2,241
Income before income taxes | 78,151 |  |  | 79,521 |  |  | 241,291 | 179,447
Income taxes | 14,265 |  |  | 14,018 |  |  | 48,229 | 30,691
Net income | 63,886 |  |  | 65,503 |  |  | 193,062 | 148,756
Preferred stock dividends of subsidiaries | 471 |  |  | 471 |  |  | 1,417 | 1,417
Net income for common stock | 63,415 | $ 63,872 | $ 64,358 | 65,032 | $ 48,887 | $ 33,420 | 191,645 | 147,339
Consolidating adjustments |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Total expenses |  |  |  | 0 |  |  |  |
Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 679,499 |  |  | 562,568 |  |  | 1,846,242 | 1,694,225
Expenses |  |  |  |  |  |  |  |
Fuel oil | 180,682 |  |  | 105,042 |  |  | 447,245 | 390,714
Purchased power | 185,759 |  |  | 149,025 |  |  | 490,520 | 425,679
Other operation and maintenance | 116,468 |  |  | 111,243 |  |  | 349,180 | 348,831
Depreciation | 57,386 |  |  | 55,689 |  |  | 172,122 | 167,235
Taxes, other than income taxes | 64,012 |  |  | 53,051 |  |  | 175,185 | 161,489
Total expenses | 604,307 |  |  | 474,050 |  |  | 1,634,252 | 1,493,948
Total operating income | 75,192 |  |  | 88,518 |  |  | 211,990 | 200,277
Allowance for equity funds used during construction | 2,427 |  |  | 2,347 |  |  | 6,995 | 6,556
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 877 |  |  | (432) |  |  | 2,918 | (1,195)
Interest expense and other charges, net | (18,148) |  |  | (16,836) |  |  | (54,126) | (50,768)
Allowance for borrowed funds used during construction | 827 |  |  | 801 |  |  | 2,386 | 2,241
Income before income taxes | 61,175 |  |  | 74,398 |  |  | 170,163 | 157,111
Income taxes | 10,335 |  |  | 13,835 |  |  | 33,066 | 29,316
Net income | 50,840 |  |  | 60,563 |  |  | 137,097 | 127,795
Preferred stock dividends of subsidiaries | 228 |  |  | 228 |  |  | 686 | 686
Net income attributable to Hawaiian Electric | 50,612 |  |  | 60,335 |  |  | 136,411 | 127,109
Preferred stock dividends of Hawaiian Electric | 270 |  |  | 270 |  |  | 810 | 810
Net income for common stock | 50,342 | $ 41,901 | $ 43,358 | 60,065 | $ 42,329 | $ 23,905 | 135,601 | 126,299
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 478,046 |  |  | 398,877 |  |  | 1,301,297 | 1,200,677
Expenses |  |  |  |  |  |  |  |
Fuel oil | 126,909 |  |  | 70,557 |  |  | 306,982 | 268,382
Purchased power | 136,688 |  |  | 116,249 |  |  | 370,240 | 333,146
Other operation and maintenance | 75,191 |  |  | 71,179 |  |  | 230,429 | 231,090
Depreciation | 38,912 |  |  | 37,853 |  |  | 116,733 | 113,724
Taxes, other than income taxes | 45,239 |  |  | 38,005 |  |  | 124,167 | 115,179
Total expenses | 422,939 |  |  | 333,843 |  |  | 1,148,551 | 1,061,521
Total operating income | 55,107 |  |  | 65,034 |  |  | 152,746 | 139,156
Allowance for equity funds used during construction | 1,999 |  |  | 1,902 |  |  | 5,677 | 5,452
Equity in earnings of subsidiaries | 12,028 |  |  | 14,912 |  |  | 35,282 | 37,492
Retirement defined benefits credit (expense)—other than service costs | 741 |  |  | (591) |  |  | 2,511 | (1,683)
Interest expense and other charges, net | (12,943) |  |  | (11,970) |  |  | (38,604) | (36,471)
Allowance for borrowed funds used during construction | 676 |  |  | 659 |  |  | 1,921 | 1,887
Income before income taxes | 57,608 |  |  | 69,946 |  |  | 159,533 | 145,833
Income taxes | 6,996 |  |  | 9,611 |  |  | 23,122 | 18,724
Net income | 50,612 |  |  | 60,335 |  |  | 136,411 | 127,109
Preferred stock dividends of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Net income attributable to Hawaiian Electric | 50,612 |  |  | 60,335 |  |  | 136,411 | 127,109
Preferred stock dividends of Hawaiian Electric | 270 |  |  | 270 |  |  | 810 | 810
Net income for common stock | 50,342 |  |  | 60,065 |  |  | 135,601 | 126,299
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 100,313 |  |  | 82,172 |  |  | 276,974 | 249,970
Expenses |  |  |  |  |  |  |  |
Fuel oil | 21,104 |  |  | 17,047 |  |  | 57,175 | 55,733
Purchased power | 31,159 |  |  | 17,665 |  |  | 76,992 | 53,032
Other operation and maintenance | 19,964 |  |  | 17,565 |  |  | 57,350 | 54,250
Depreciation | 10,050 |  |  | 9,760 |  |  | 30,151 | 29,281
Taxes, other than income taxes | 9,333 |  |  | 7,512 |  |  | 25,865 | 23,324
Total expenses | 91,610 |  |  | 69,549 |  |  | 247,533 | 215,620
Total operating income | 8,703 |  |  | 12,623 |  |  | 29,441 | 34,350
Allowance for equity funds used during construction | 131 |  |  | 208 |  |  | 403 | 520
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 166 |  |  | 194 |  |  | 503 | 581
Interest expense and other charges, net | (2,590) |  |  | (2,519) |  |  | (7,744) | (7,536)
Allowance for borrowed funds used during construction | 44 |  |  | 65 |  |  | 136 | 163
Income before income taxes | 6,454 |  |  | 10,571 |  |  | 22,739 | 28,078
Income taxes | 1,433 |  |  | 2,378 |  |  | 5,152 | 6,372
Net income | 5,021 |  |  | 8,193 |  |  | 17,587 | 21,706
Preferred stock dividends of subsidiaries | 133 |  |  | 133 |  |  | 400 | 400
Net income attributable to Hawaiian Electric | 4,888 |  |  | 8,060 |  |  | 17,187 | 21,306
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | 4,888 |  |  | 8,060 |  |  | 17,187 | 21,306
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 101,141 |  |  | 81,629 |  |  | 267,992 | 244,043
Expenses |  |  |  |  |  |  |  |
Fuel oil | 32,669 |  |  | 17,438 |  |  | 83,088 | 66,599
Purchased power | 17,912 |  |  | 15,111 |  |  | 43,288 | 39,501
Other operation and maintenance | 21,313 |  |  | 22,499 |  |  | 61,401 | 63,491
Depreciation | 8,424 |  |  | 8,076 |  |  | 25,238 | 24,230
Taxes, other than income taxes | 9,440 |  |  | 7,534 |  |  | 25,153 | 22,986
Total expenses | 89,758 |  |  | 70,658 |  |  | 238,168 | 216,807
Total operating income | 11,383 |  |  | 10,971 |  |  | 29,824 | 27,236
Allowance for equity funds used during construction | 297 |  |  | 237 |  |  | 915 | 584
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | (30) |  |  | (35) |  |  | (96) | (93)
Interest expense and other charges, net | (2,616) |  |  | (2,457) |  |  | (7,799) | (7,226)
Allowance for borrowed funds used during construction | 107 |  |  | 77 |  |  | 329 | 191
Income before income taxes | 9,141 |  |  | 8,793 |  |  | 23,173 | 20,692
Income taxes | 1,906 |  |  | 1,846 |  |  | 4,792 | 4,220
Net income | 7,235 |  |  | 6,947 |  |  | 18,381 | 16,472
Preferred stock dividends of subsidiaries | 95 |  |  | 95 |  |  | 286 | 286
Net income attributable to Hawaiian Electric | 7,140 |  |  | 6,852 |  |  | 18,095 | 16,186
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | 7,140 |  |  | 6,852 |  |  | 18,095 | 16,186
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 (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
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 | (1) |  |  | (110) |  |  | (21) | (465)
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 | (1) |  |  | (110) |  |  | (21) | (465)
Allowance for equity funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Equity in earnings of subsidiaries | (12,028) |  |  | (14,912) |  |  | (35,282) | (37,492)
Retirement defined benefits credit (expense)—other than service costs | 0 |  |  | 0 |  |  | 0 | 0
Interest expense and other charges, net | 1 |  |  | 110 |  |  | 21 | 465
Allowance for borrowed funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Income before income taxes | (12,028) |  |  | (14,912) |  |  | (35,282) | (37,492)
Income taxes | 0 |  |  |  |  |  | 0 | 0
Net income | (12,028) |  |  | (14,912) |  |  | (35,282) | (37,492)
Preferred stock dividends of subsidiaries | 0 |  |  |  |  |  | 0 | 0
Net income attributable to Hawaiian Electric | (12,028) |  |  | (14,912) |  |  | (35,282) | (37,492)
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | $ (12,028) |  |  | $ (14,912) |  |  | $ (35,282) | $ (37,492)

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