XML 152 R118.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income taxes - Deferred Tax Assets and Liabilities Due to Book/Tax Differences (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Regulatory liabilities, excluding amounts attributable to property, plant and equipment $ 104,984,000 $ 0
Net operating loss 0 0
Allowance for bad debts 16,192,000 24,500,000
Other 24,397,000 47,201,000
Total deferred tax assets 145,573,000 71,701,000
Deferred tax liabilities    
Property, plant and equipment related 415,452,000 642,266,000
Regulatory assets, excluding amounts attributable to property, plant and equipment 38,314,000 35,107,000
Deferred RAM and RBA revenues 15,038,000 26,053,000
Retirement benefits 32,952,000 48,400,000
Other 32,247,000 48,681,000
Total deferred tax liabilities 534,003,000 800,507,000
Net deferred income tax liability 388,430,000 728,806,000
Hawaiian Electric Company, Inc. and Subsidiaries    
Deferred tax assets    
Regulatory liabilities, excluding amounts attributable to property, plant and equipment 104,984,000 0
Net operating loss 0 9,158,000
Allowance for bad debts 1,812,000 2,364,000
Other 11,253,000 18,720,000
Total deferred tax assets 118,049,000 30,242,000
Deferred tax liabilities    
Property, plant and equipment related 413,891,000 640,667,000
Regulatory assets, excluding amounts attributable to property, plant and equipment 38,314,000 35,107,000
Deferred RAM and RBA revenues 15,038,000 26,053,000
Retirement benefits 38,020,000 51,445,000
Other 6,827,000 10,629,000
Total deferred tax liabilities 512,090,000 763,901,000
Net deferred income tax liability $ 394,041,000 $ 733,659,000