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Income taxes - Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Regulatory liabilities, excluding amounts attributable to property, plant and equipment $ 82,488 $ 87,817
Operating lease liabilities 45,016 35,449
Retirement benefits 7,692 0
Revenue taxes 51,392 35,040
Allowance for bad debts 22,734 26,217
Available-for-sale investments 120,405 11,728
Other 39,399 46,790
Total deferred tax assets 369,126 243,041
Deferred tax liabilities    
Property, plant and equipment related 511,832 500,659
Operating lease right-of-use assets 44,461 35,271
Regulatory assets, excluding amounts attributable to property, plant and equipment 22,183 23,700
Retirement benefits 0 6,863
Other 53,112 61,308
Total deferred tax liabilities 631,588 627,801
Net deferred income tax liability 262,462 384,760
Deferred tax assets, tax credit carryforwards 4,300  
Hawaiian Electric Company, Inc. and Subsidiaries    
Deferred tax assets    
Regulatory liabilities, excluding amounts attributable to property, plant and equipment 82,488 87,817
Operating lease liabilities 37,472 29,661
Retirement benefits 6,852 0
Revenue taxes 51,392 35,040
Allowance for bad debts 2,195 7,156
Available-for-sale investments 0 0
Other 20,287 20,529
Total deferred tax assets 200,686 180,203
Deferred tax liabilities    
Property, plant and equipment related 497,929 490,713
Operating lease right-of-use assets 37,472 29,661
Regulatory assets, excluding amounts attributable to property, plant and equipment 22,183 23,700
Retirement benefits 0 8,261
Other 27,532 36,502
Total deferred tax liabilities 585,116 588,837
Net deferred income tax liability 384,430 $ 408,634
State and Local Jurisdiction    
Deferred tax liabilities    
Tax credit carryforward $ 5,600