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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
DEFERRED TAX ASSETS |  |  |
Risk management activities | $ 17,552 |  | $ 15,785
Regulatory liabilities: |  |  |
Excess deferred income taxes - Tax Cuts and Jobs Act | 335,877 |  | 376,869
Asset retirement obligation and removal costs | 143,011 |  | 117,201
Unamortized investment tax credits | 52,236 |  | 53,284
Other postretirement liabilities | 43,841 |  | 40,532
Other | 52,382 |  | 40,380
Pension liabilities | 73,210 |  | 112,019
Coal reclamation liabilities | 40,837 |  | 47,508
Renewable energy incentives | 28,066 |  | 30,779
Credit and loss carryforwards | 54,795 |  | 1,755
Other | 63,102 |  | 58,820
Total deferred tax assets | 904,909 |  | 894,932
DEFERRED TAX LIABILITIES |  |  |
Plant-related | (2,448,458) |  | (2,277,724)
Risk management activities | (27) |  | (237)
Other postretirement assets and other special use funds | (66,399) |  | (57,697)
Regulatory assets: |  |  |
Allowance for equity funds used during construction | (40,023) |  | (39,086)
Deferred fuel and purchased power | (35,162) |  | (23,086)
Pension benefits | (163,339) |  | (181,504)
Retired power plant costs (see Note 4) | (42,228) |  | (48,348)
Other | (82,722) |  | (72,096)
Other | (18,890) |  | (2,575)
Total deferred tax liabilities | (2,897,248) | $ (56,000) | (2,702,353)
Deferred income taxes — net | (1,992,339) |  | (1,807,421)
ARIZONA PUBLIC SERVICE COMPANY |  |  |
DEFERRED TAX ASSETS |  |  |
Risk management activities | 17,552 |  | 15,785
Regulatory liabilities: |  |  |
Excess deferred income taxes - Tax Cuts and Jobs Act | 335,877 |  | 376,869
Asset retirement obligation and removal costs | 143,011 |  | 117,201
Unamortized investment tax credits | 52,236 |  | 53,284
Other postretirement liabilities | 43,841 |  | 40,532
Other | 52,382 |  | 40,380
Pension liabilities | 67,976 |  | 107,009
Coal reclamation liabilities | 40,837 |  | 47,508
Renewable energy incentives | 28,066 |  | 30,779
Credit and loss carryforwards | 10,992 |  | 0
Other | 70,948 |  | 59,919
Total deferred tax assets | 863,718 |  | 889,266
DEFERRED TAX LIABILITIES |  |  |
Plant-related | (2,448,458) |  | (2,277,724)
Risk management activities | (27) |  | (237)
Other postretirement assets and other special use funds | (65,965) |  | (57,274)
Regulatory assets: |  |  |
Allowance for equity funds used during construction | (40,023) |  | (39,086)
Deferred fuel and purchased power | (35,162) |  | (23,086)
Pension benefits | (163,339) |  | (181,504)
Retired power plant costs (see Note 4) | (42,228) |  | (48,348)
Other | (82,722) |  | (72,096)
Other | (18,890) |  | (2,575)
Total deferred tax liabilities | (2,896,814) |  | (2,701,930)
Deferred income taxes — net | $ (2,033,096) |  | $ (1,812,664)

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