Income tax Income tax (Tables)

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The significant differences between the U.S. Federal statutory tax rate and PGE’s effective tax rate are

reflected in the following table:

	Three Months Ended March 31,
	2020		2019
Federal statutory tax rate	21.0	%	21.0	%
Federal tax credits*	(10.9	)	(12.7	)
State and local taxes, net of federal tax benefit	7.4		6.5
Flow through depreciation and cost basis differences	1.6		1.3
Amortization of excess deferred income tax	(1.9	)	(3.7	)
Other	1.0		0.7
Effective tax rate	18.2	%	13.1	%

* Federal tax credits consists 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 2024.