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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 641,427 |  |  | $ 770,882 |  |  | $ 1,927,558 | $ 2,147,982
Expenses |  |  |  |  |  |  |  |
Total expenses | 541,866 |  |  | 674,227 |  |  | 1,696,739 | 1,900,756
Total operating income | 99,561 |  |  | 96,655 |  |  | 230,819 | 247,226
Allowance for equity funds used during construction | 2,347 |  |  | 3,250 |  |  | 6,556 | 9,335
Retirement defined benefits expense—other than service costs | (1,102) |  |  | (648) |  |  | (2,970) | (2,172)
Allowance for borrowed funds used during construction | 801 |  |  | 1,208 |  |  | 2,241 | 3,465
Income before income taxes | 79,521 |  |  | 78,693 |  |  | 179,447 | 189,426
Income taxes | 14,018 |  |  | 14,803 |  |  | 30,691 | 36,390
Net income | 65,503 |  |  | 63,890 |  |  | 148,756 | 153,036
Preferred stock dividends of subsidiaries | 471 |  |  | 471 |  |  | 1,417 | 1,417
Net income for common stock | 65,032 | $ 48,887 | $ 33,420 | 63,419 | $ 42,512 | $ 45,688 | 147,339 | 151,619
Consolidating adjustments |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | (110) |  |  | (205) |  |  | (465) | (439)
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 | (110) |  |  | (205) |  |  | (465) | (439)
Allowance for equity funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Equity in earnings of subsidiaries | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Retirement defined benefits expense—other than service costs | 0 |  |  | 0 |  |  | 0 | 0
Interest expense and other charges, net | 110 |  |  | 205 |  |  | 465 | 439
Allowance for borrowed funds used during construction | 0 |  |  | 0 |  |  | 0 | 0
Income before income taxes | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Income taxes |  |  |  | 0 |  |  | 0 | 0
Net income | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Preferred stock dividends of subsidiaries |  |  |  | 0 |  |  | 0 | 0
Net income attributable to Hawaiian Electric | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | (14,912) |  |  | (11,048) |  |  | (37,492) | (30,983)
Hawaiian Electric (parent only) |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Purchased power | 149,000 |  |  | 176,000 |  |  | 426,000 | 472,000
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 398,877 |  |  | 491,723 |  |  | 1,200,677 | 1,347,412
Expenses |  |  |  |  |  |  |  |
Fuel oil | 70,557 |  |  | 139,747 |  |  | 268,382 | 374,100
Purchased power | 116,249 |  |  | 135,447 |  |  | 333,146 | 367,541
Other operation and maintenance | 71,179 |  |  | 80,582 |  |  | 231,090 | 240,311
Depreciation | 37,853 |  |  | 35,867 |  |  | 113,724 | 107,602
Taxes, other than income taxes | 38,005 |  |  | 46,433 |  |  | 115,179 | 127,654
Total expenses | 333,843 |  |  | 438,076 |  |  | 1,061,521 | 1,217,208
Total operating income | 65,034 |  |  | 53,647 |  |  | 139,156 | 130,204
Allowance for equity funds used during construction | 1,902 |  |  | 2,685 |  |  | 5,452 | 7,746
Equity in earnings of subsidiaries | 14,912 |  |  | 11,048 |  |  | 37,492 | 30,983
Retirement defined benefits expense—other than service costs | (591) |  |  | (582) |  |  | (1,683) | (1,716)
Interest expense and other charges, net | (11,970) |  |  | (12,771) |  |  | (36,471) | (38,961)
Allowance for borrowed funds used during construction | 659 |  |  | 990 |  |  | 1,887 | 2,854
Income before income taxes | 69,946 |  |  | 55,017 |  |  | 145,833 | 131,110
Income taxes | 9,611 |  |  | 7,968 |  |  | 18,724 | 18,821
Net income | 60,335 |  |  | 47,049 |  |  | 127,109 | 112,289
Preferred stock dividends of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Net income attributable to Hawaiian Electric | 60,335 |  |  | 47,049 |  |  | 127,109 | 112,289
Preferred stock dividends of Hawaiian Electric | 270 |  |  | 270 |  |  | 810 | 810
Net income for common stock | 60,065 |  |  | 46,779 |  |  | 126,299 | 111,479
HELCO | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 82,172 |  |  | 93,576 |  |  | 249,970 | 270,697
Expenses |  |  |  |  |  |  |  |
Fuel oil | 17,047 |  |  | 21,427 |  |  | 55,733 | 62,210
Purchased power | 17,665 |  |  | 24,342 |  |  | 53,032 | 67,548
Other operation and maintenance | 17,565 |  |  | 19,868 |  |  | 54,250 | 56,635
Depreciation | 9,760 |  |  | 10,453 |  |  | 29,281 | 31,359
Taxes, other than income taxes | 7,512 |  |  | 8,359 |  |  | 23,324 | 25,170
Total expenses | 69,549 |  |  | 84,449 |  |  | 215,620 | 242,922
Total operating income | 12,623 |  |  | 9,127 |  |  | 34,350 | 27,775
Allowance for equity funds used during construction | 208 |  |  | 229 |  |  | 520 | 579
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits expense—other than service costs | 194 |  |  | (105) |  |  | 581 | (316)
Interest expense and other charges, net | (2,519) |  |  | (2,524) |  |  | (7,536) | (8,345)
Allowance for borrowed funds used during construction | 65 |  |  | 95 |  |  | 163 | 242
Income before income taxes | 10,571 |  |  | 6,822 |  |  | 28,078 | 19,935
Income taxes | 2,378 |  |  | 1,420 |  |  | 6,372 | 4,431
Net income | 8,193 |  |  | 5,402 |  |  | 21,706 | 15,504
Preferred stock dividends of subsidiaries | 133 |  |  | 133 |  |  | 400 | 400
Net income attributable to Hawaiian Electric | 8,060 |  |  | 5,269 |  |  | 21,306 | 15,104
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | 8,060 |  |  | 5,269 |  |  | 21,306 | 15,104
Maui Electric | Reportable Legal Entities |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 81,629 |  |  | 103,236 |  |  | 244,043 | 282,939
Expenses |  |  |  |  |  |  |  |
Fuel oil | 17,438 |  |  | 37,919 |  |  | 66,599 | 105,012
Purchased power | 15,111 |  |  | 15,248 |  |  | 39,501 | 37,247
Other operation and maintenance | 22,499 |  |  | 23,965 |  |  | 63,491 | 64,859
Depreciation | 8,076 |  |  | 7,615 |  |  | 24,230 | 22,834
Taxes, other than income taxes | 7,534 |  |  | 9,265 |  |  | 22,986 | 26,480
Total expenses | 70,658 |  |  | 94,012 |  |  | 216,807 | 256,432
Total operating income | 10,971 |  |  | 9,224 |  |  | 27,236 | 26,507
Allowance for equity funds used during construction | 237 |  |  | 336 |  |  | 584 | 1,010
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits expense—other than service costs | (35) |  |  | (36) |  |  | (93) | (95)
Interest expense and other charges, net | (2,457) |  |  | (2,339) |  |  | (7,226) | (7,078)
Allowance for borrowed funds used during construction | 77 |  |  | 123 |  |  | 191 | 369
Income before income taxes | 8,793 |  |  | 7,308 |  |  | 20,692 | 20,713
Income taxes | 1,846 |  |  | 1,434 |  |  | 4,220 | 4,548
Net income | 6,947 |  |  | 5,874 |  |  | 16,472 | 16,165
Preferred stock dividends of subsidiaries | 95 |  |  | 95 |  |  | 286 | 286
Net income attributable to Hawaiian Electric | 6,852 |  |  | 5,779 |  |  | 16,186 | 15,879
Preferred stock dividends of Hawaiian Electric | 0 |  |  | 0 |  |  | 0 | 0
Net income for common stock | 6,852 |  |  | 5,779 |  |  | 16,186 | 15,879
Other subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |
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 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 Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |
Revenues | 562,568 |  |  | 688,330 |  |  | 1,694,225 | 1,900,609
Expenses |  |  |  |  |  |  |  |
Fuel oil | 105,042 |  |  | 199,093 |  |  | 390,714 | 541,322
Purchased power | 149,025 |  |  | 175,037 |  |  | 425,679 | 472,336
Other operation and maintenance | 111,243 |  |  | 124,415 |  |  | 348,831 | 361,805
Depreciation | 55,689 |  |  | 53,935 |  |  | 167,235 | 161,795
Taxes, other than income taxes | 53,051 |  |  | 64,057 |  |  | 161,489 | 179,304
Total expenses | 474,050 |  |  | 616,537 |  |  | 1,493,948 | 1,716,562
Total operating income | 88,518 |  |  | 71,793 |  |  | 200,277 | 184,047
Allowance for equity funds used during construction | 2,347 |  |  | 3,250 |  |  | 6,556 | 9,335
Equity in earnings of subsidiaries | 0 |  |  | 0 |  |  | 0 | 0
Retirement defined benefits expense—other than service costs | (432) |  |  | (723) |  |  | (1,195) | (2,127)
Interest expense and other charges, net | (16,836) |  |  | (17,429) |  |  | (50,768) | (53,945)
Allowance for borrowed funds used during construction | 801 |  |  | 1,208 |  |  | 2,241 | 3,465
Income before income taxes | 74,398 |  |  | 58,099 |  |  | 157,111 | 140,775
Income taxes | 13,835 |  |  | 10,822 |  |  | 29,316 | 27,800
Net income | 60,563 |  |  | 47,277 |  |  | 127,795 | 112,975
Preferred stock dividends of subsidiaries | 228 |  |  | 228 |  |  | 686 | 686
Net income attributable to Hawaiian Electric | 60,335 |  |  | 47,049 |  |  | 127,109 | 112,289
Preferred stock dividends of Hawaiian Electric | 270 |  |  | 270 |  |  | 810 | 810
Net income for common stock | $ 60,065 | $ 42,329 | $ 23,905 | $ 46,779 | $ 32,574 | $ 32,126 | $ 126,299 | $ 111,479

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