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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
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)