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Jointly Owned Plants (Tables)
 12 Months Ended
Dec. 31, 2016
Jointly Owned Plants Disclosure [Abstract]  
Summary of NRG's proportionate ownership interest in the company's jointly-owned facilities
The following table summarizes NRG's proportionate ownership interest in the Company's jointly-owned facilities:
As of December 31, 2016
Ownership
Interest
 
Property, Plant &
Equipment
 
Accumulated
Depreciation
 
Construction in
Progress
 
(In millions unless otherwise stated)
South Texas Project Units 1 and 2, Bay City, TX
44.00
%
 
$
3,275

 
$
(1,734
)
 
$
39

Big Cajun II Unit 3, New Roads, LA
58.00
%
 
204

 
123

 
—

Cedar Bayou Unit 4, Baytown, TX
50.00
%
 
216

 
(67
)
 
5

Keystone, Shelocta, PA
3.70
%
 
97

 
(48
)
 
—

Conemaugh, New Florence, PA
3.72
%
 
103

 
(51
)
 
1