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Income taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Expense (Benefit) [Line Items] |  |  |
Amount at the federal statutory income tax rate | $ 63,881 | $ 65,281 | $ 50,531
Increase (decrease) resulting from: |  |  |
State income taxes, net of federal income tax benefit | 14,438 | 15,735 | 9,448
Net deferred tax asset (liability) adjustment related to the Tax Act | (9,886) | (9,886) | (11,267)
Other, net | (7,266) | (8,323) | (7,802)
Total | $ 61,167 | $ 62,807 | $ 40,910
Effective income tax rate (%) | 20.10% | 20.20% | 17.00%
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Income Tax Expense (Benefit) [Line Items] |  |  |
Amount at the federal statutory income tax rate | $ 50,526 | $ 46,995 | $ 44,468
Increase (decrease) resulting from: |  |  |
State income taxes, net of federal income tax benefit | 11,026 | 10,323 | 9,658
Net deferred tax asset (liability) adjustment related to the Tax Act | (9,886) | (9,886) | (11,267)
Other, net | (1,990) | (3,284) | (2,441)
Total | $ 49,676 | $ 44,148 | $ 40,418
Effective income tax rate (%) | 20.60% | 19.70% | 19.10%

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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