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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
DEFERRED TAX ASSETS |  |
Risk management activities | $ 677 | $ 4,287
Regulatory liabilities: |  |
Excess deferred income taxes — Tax Cuts and Jobs Act | 306,915 | 319,091
Asset retirement obligation and removal costs | 174,952 | 157,470
Unamortized investment tax credits | 49,601 | 50,879
Other postretirement liabilities | 92,654 | 95,778
Other | 65,815 | 43,551
Operating lease liabilities | 204,890 | 107,853
Pension liabilities | 42,136 | 45,853
Coal reclamation liabilities | 43,165 | 42,065
Renewable energy incentives | 22,646 | 25,355
Credit and loss carryforwards | 57,077 | 26,460
Other | 74,184 | 78,113
Total deferred tax assets | 1,134,712 | 996,755
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,570,613) | (2,489,899)
Risk management activities | (27,276) | (1,174)
Pension and other postretirement assets | (133,624) | (123,462)
Other special use funds | (64,610) | (42,927)
Operating lease right-of-use assets | (204,890) | (107,853)
Regulatory assets: |  |
Allowance for equity funds used during construction | (42,616) | (41,038)
Deferred fuel and purchased power | (96,033) | (47,673)
Pension benefits | (126,010) | (116,219)
Retired power plant costs | (28,389) | (35,214)
Other | (123,902) | (106,227)
Other | (28,611) | (20,472)
Total deferred tax liabilities | (3,446,574) | (3,132,158)
Deferred income taxes — net | (2,311,862) | (2,135,403)
Arizona Public Service Company |  |
DEFERRED TAX ASSETS |  |
Risk management activities | 677 | 4,287
Regulatory liabilities: |  |
Excess deferred income taxes — Tax Cuts and Jobs Act | 306,915 | 319,091
Asset retirement obligation and removal costs | 174,952 | 157,470
Unamortized investment tax credits | 49,601 | 50,879
Other postretirement liabilities | 92,654 | 95,778
Other | 65,815 | 43,551
Operating lease liabilities | 204,378 | 107,414
Pension liabilities | 37,814 | 40,168
Coal reclamation liabilities | 43,165 | 42,065
Renewable energy incentives | 22,646 | 25,355
Credit and loss carryforwards | 18,902 | 8,034
Other | 74,184 | 78,113
Total deferred tax assets | 1,091,703 | 972,205
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,570,613) | (2,489,899)
Risk management activities | (27,276) | (1,174)
Pension and other postretirement assets | (132,769) | (122,580)
Other special use funds | (64,610) | (42,927)
Operating lease right-of-use assets | (204,378) | (107,414)
Regulatory assets: |  |
Allowance for equity funds used during construction | (42,616) | (41,038)
Deferred fuel and purchased power | (96,033) | (47,673)
Pension benefits | (126,010) | (116,219)
Retired power plant costs | (28,389) | (35,214)
Other | (123,902) | (106,227)
Other | (6,808) | (5,513)
Total deferred tax liabilities | (3,423,404) | (3,115,878)
Deferred income taxes — net | $ (2,331,701) | $ (2,143,673)

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