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Income tax Income tax (Tables)
3 Months Ended
Mar. 31, 2024
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 March 31,
20242023
Federal statutory tax rate21.0 %21.0 %
Federal tax credits*
(16.2)(9.3)
State and local taxes, net of federal tax benefit9.1 9.0 
Flow-through depreciation and cost basis differences0.2 1.0 
Amortization of excess deferred income tax(3.3)(3.7)
Other(0.1)(2.1)
Effective tax rate10.7 %15.9 %
* 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 PTC generation will end at various dates through 2034.