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Income tax Income tax (Tables)
 9 Months Ended
Sep. 30, 2018
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
September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Federal statutory tax rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Federal tax credits*
(12.3
)
 
(12.8
)
 
(15.8
)
 
(14.4
)
State and local taxes, net of federal tax benefit
6.5

 
5.3

 
6.5

 
5.2

Flow through depreciation and cost basis differences
(0.1
)
 
3.4

 
(2.3
)
 
1.0

Other
(0.6
)
 
(6.4
)
 
3.0

 
(2.7
)
Effective tax rate
14.5
 %
 
24.5
 %
 
12.4
 %
 
24.1
 %
 
 
 
 
 
 
 
 
* Federal tax credits consists of production tax credits (PTCs) earned from Company-owned wind-powered generating facilities. The federal 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. The PTCs are generated for 10 years from the in-service dates of the corresponding facilities. PGE’s PTC generation ends at various dates through 2024.