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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
DEFERRED TAX ASSETS    
Risk management activities $ 15,785 $ 25,103
Regulatory liabilities:    
Excess deferred income taxes - Tax Cuts and Jobs Act 376,869 376,906
Asset retirement obligation and removal costs 117,201 135,847
Unamortized investment tax credits 53,284 54,661
Other postretirement liabilities 40,532 47,021
Other 40,380 37,489
Pension liabilities 112,019 83,126
Coal reclamation liabilities 47,508 45,802
Renewable energy incentives 30,779 33,546
Credit and loss carryforwards 1,755 53,946
Other 58,820 56,630
Total deferred tax assets 894,932 950,077
DEFERRED TAX LIABILITIES    
Plant-related (2,277,724) (2,220,886)
Risk management activities (237) (491)
Other postretirement assets and other special use funds (57,697) (66,134)
Regulatory assets:    
Allowance for equity funds used during construction (39,086) (36,365)
Deferred fuel and purchased power (23,086) (40,778)
Pension benefits (181,504) (142,848)
Retired power plant costs (see Note 3) (48,348) (53,611)
Other (72,096) (74,423)
Other (2,575) (5,346)
Total deferred tax liabilities (2,702,353) (2,640,882)
Deferred income taxes — net (1,807,421) (1,690,805)
ARIZONA PUBLIC SERVICE COMPANY    
DEFERRED TAX ASSETS    
Risk management activities 15,785 25,103
Regulatory liabilities:    
Excess deferred income taxes - Tax Cuts and Jobs Act 376,869 376,906
Asset retirement obligation and removal costs 117,201 135,847
Unamortized investment tax credits 53,284 54,661
Other postretirement liabilities 40,532 47,021
Other 40,380 37,489
Pension liabilities 107,009 77,280
Coal reclamation liabilities 47,508 45,802
Renewable energy incentives 30,779 33,546
Credit and loss carryforwards 0 1,920
Other 59,919 62,421
Total deferred tax assets 889,266 897,996
DEFERRED TAX LIABILITIES    
Plant-related (2,277,724) (2,220,886)
Risk management activities (237) (491)
Other postretirement assets and other special use funds (57,274) (65,733)
Regulatory assets:    
Allowance for equity funds used during construction (39,086) (36,365)
Deferred fuel and purchased power (23,086) (40,778)
Pension benefits (181,504) (142,848)
Retired power plant costs (see Note 3) (48,348) (53,611)
Other (72,096) (74,423)
Other (2,575) (5,346)
Total deferred tax liabilities (2,701,930) (2,640,481)
Deferred income taxes — net $ (1,812,664) $ (1,742,485)