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Income tax Income tax (Tables)
 6 Months Ended
Jun. 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 as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Federal statutory tax rate
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Federal tax credits*
(17.0
)
 
(12.4
)
 
(17.5
)
 
(15.0
)
State and local taxes, net of federal tax benefit
6.5

 
5.2

 
6.5

 
5.1

Flow through depreciation and cost basis differences
(2.2
)
 
(1.7
)
 
(3.4
)
 
0.1

Other
3.2

 
(2.3
)
 
4.7

 
(1.3
)
Effective tax rate
11.5
 %
 
23.8
 %
 
11.3
 %
 
23.9
 %
 
 
 
 
 
 
 
 
* 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 corresponding facilities’ in-service dates. PGE’s PTC generation ends at various dates through 2024.