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Jointly-owned Plant (Tables)
12 Months Ended
Dec. 31, 2012
Jointly-owned Plant [Abstract]  
Schedule of Jointly Owned Utility Plants [Table Text Block]
As of December 31, 2012, 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
65.00
%
 
1980
 
$
479

 
$
308

 
$
8

Colstrip
20.00

 
1986
 
507

 
328

 
3

Pelton/Round Butte
66.67

 
1958
/
1964
 
215

 
48

 
5

Total
 
 
 
 
 
 
$
1,201

 
$
684

 
$
16

 
 
 
 
 
*
Excludes asset retirement obligations and accumulated asset retirement removal costs.