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Income tax Income tax (Tables)
6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] The significant differences between the Federal statutory tax rate and PGE’s effective tax rate are reflected in the following table:
Three Months Ended June 30, Six Months Ended June 30,
2022202120222021
Federal statutory tax rate21.0 %21.0 %21.0 %21.0 %
Federal tax credits*
(9.5)(11.7)(10.0)(9.6)
State and local taxes, net of federal tax benefit9.0 8.3 9.0 8.7 
Flow-through depreciation and cost basis differences0.6 (3.0)0.6 (0.5)
Amortization of excess deferred income tax(4.1)(3.4)(4.3)(3.3)
Local tax flow-through adjustment— — — (6.1)
Other(0.1)(0.1)(0.1)(1.0)
Effective tax rate16.9 %11.1 %16.2 %9.2 %
* Federal tax credits primarily consist of production tax credits (PTCs) earned from Company-owned wind-powered generating facilities. PTCs are earned based on a per-kilowatt hour rate and, as a result, the annual amount of PTCs earned will vary based on weather conditions and availability of the facilities. PTCs are earned for 10 years from the in-service dates of the corresponding facilities. PGE’s wind-powered generating facilities are eligible to earn PTCs until various dates through 2030.