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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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DEFERRED TAX ASSETS |  |
Risk management activities | $ 8,826 | $ 677
Regulatory liabilities: |  |
Excess deferred income taxes — Tax Cuts and Jobs Act | 295,014 | 306,915
Asset retirement obligation and removal costs | 107,104 | 174,952
Unamortized investment tax credits | 48,035 | 49,601
Other postretirement benefits | 66,893 | 92,654
Other | 62,915 | 65,815
Operating lease liabilities | 184,030 | 204,890
Pension liabilities | 33,674 | 42,136
Coal reclamation liabilities | 44,312 | 43,165
Renewable energy incentives | 19,948 | 22,646
Credit and loss carryforwards | 37,647 | 57,077
Other | 72,605 | 74,184
Total deferred tax assets | 981,003 | 1,134,712
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,518,164) | (2,570,613)
Risk management activities | (32,648) | (27,276)
Pension and other postretirement assets | (96,845) | (133,624)
Other special use funds | (57,572) | (64,610)
Operating lease right-of-use assets | (184,030) | (204,890)
Regulatory assets: |  |
Allowance for equity funds used during construction | (44,405) | (42,616)
Deferred fuel and purchased power | (114,232) | (96,033)
Pension benefits | (157,629) | (126,010)
Retired power plant costs | (24,397) | (28,389)
Other | (103,023) | (123,902)
Other | (32,479) | (28,611)
Total deferred tax liabilities | (3,365,424) | (3,446,574)
Deferred income taxes — net | (2,384,421) | (2,311,862)
Arizona Public Service Company |  |
DEFERRED TAX ASSETS |  |
Risk management activities | 8,826 | 677
Regulatory liabilities: |  |
Excess deferred income taxes — Tax Cuts and Jobs Act | 295,014 | 306,915
Asset retirement obligation and removal costs | 107,104 | 174,952
Unamortized investment tax credits | 48,035 | 49,601
Other postretirement benefits | 66,893 | 92,654
Other | 62,915 | 65,815
Operating lease liabilities | 182,663 | 204,378
Pension liabilities | 30,436 | 37,814
Coal reclamation liabilities | 44,312 | 43,165
Renewable energy incentives | 19,948 | 22,646
Credit and loss carryforwards | 13,654 | 18,902
Other | 72,605 | 74,184
Total deferred tax assets | 952,405 | 1,091,703
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,518,164) | (2,570,613)
Risk management activities | (32,648) | (27,276)
Pension and other postretirement assets | (96,196) | (132,769)
Other special use funds | (57,572) | (64,610)
Operating lease right-of-use assets | (182,663) | (204,378)
Regulatory assets: |  |
Allowance for equity funds used during construction | (44,405) | (42,616)
Deferred fuel and purchased power | (114,232) | (96,033)
Pension benefits | (157,629) | (126,010)
Retired power plant costs | (24,397) | (28,389)
Other | (103,023) | (123,902)
Other | (7,123) | (6,808)
Total deferred tax liabilities | (3,338,052) | (3,423,404)
Deferred income taxes — net | $ (2,385,647) | $ (2,331,701)

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