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Income tax Income tax (Tables)
 6 Months Ended
Jun. 30, 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 are reflected in the following table:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Federal statutory tax rate
21.0
 %
 
21.0
 %
 
21.0
 %
 
21.0
 %
Federal tax credits*
(15.1
)
 
(17.0
)
 
(13.3
)
 
(17.5
)
State and local taxes, net of federal tax benefit
6.5

 
6.5

 
6.5

 
6.5

Flow through depreciation and cost basis differences
0.4

 
(2.2
)
 
1.4

 
(3.4
)
Excess deferred tax amortization
(2.7
)
 
—

 
(3.2
)
 
—

Other
0.6

 
3.2

 
0.1

 
4.7

Effective tax rate
10.7
 %
 
11.5
 %
 
12.5
 %
 
11.3
 %
 
 
 
 
 
 
 
 
* 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 ends at various dates through 2024.