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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)

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