Income tax Income tax (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

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

The significant differences between the U.S. Federal statutory rate and PGE’s effective tax rate for financial reporting purposes are reflected in the following table:

	Three Months Ended March 31,
	2019		2018
Federal statutory tax rate	21.0	%	21.0	%
Federal tax credits*	(12.7	)	(18.0	)
State and local taxes, net of federal tax benefit	6.5		6.5
Flow through depreciation and cost basis differences	1.3		1.0
Excess deferred tax amortization	(3.7	)	—
Other	0.7		0.6
Effective tax rate	13.1	%	11.1	%

* 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 generated for 10 years from the in-service dates of the corresponding facilities. PGE’s PTC generation endsat various dates through 2024.