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Jointly-owned Plant (Tables)
12 Months Ended
Dec. 31, 2014
Jointly-owned Plant [Abstract]  
Schedule of Jointly Owned Utility Plants [Table Text Block]
As of December 31, 2014, PGE had the following investments in jointly-owned plant (dollars in millions):

 
PGE
Share
 
In-service Date
 
Plant
In-service
 
Accumulated
Depreciation*
 
Construction
Work In
Progress
Boardman
90.00
%
 
1980
 
$
510

 
$
350

 
$

Colstrip
20.00

 
1986
 
520

 
334

 
2

Pelton/Round Butte
66.67

 
1958
/
1964
 
237

 
55

 
8

Total
 
 
 
 
 
 
$
1,267

 
$
739

 
$
10

 
 
 
 
 
*
Excludes AROs and accumulated asset retirement removal costs.