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Investments Accounted for by the Equity Method and Variable Interest Entities (Tables)
 12 Months Ended
Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Summary NRG's equity method investments
The following table summarizes NRG's equity method investments as of December 31, 2017:
Name
Economic
Interest
 
Investment Balance
 
 
 
(In millions)
Avenal Solar Holdings LLC (a)
50.0
%
 
$
(6
)
Desert Sunlight Investment Holdings, LLC (a)
25.0
%
 
272

Elkhorn Ridge Wind, LLC (a)
47.0
%
 
73

GenConn Energy LLC (a)
50.0
%
 
102

Four Brothers Solar, LLC (a)(c)
50.0
%
 
213

Granite Mountain Holdings, LLC (a)(c)
50.0
%
 
78

Iron Springs Holdings, LLC (a)(c)
50.0
%
 
54

Midway-Sunset Cogeneration Company
50.0
%
 
16

San Juan Mesa Wind Project, LLC (a)
75.0
%
 
66

Watson Cogeneration Company
49.0
%
 
21

Gladstone Power Station (b)
37.5
%
 
139

Other(d)
Various

 
10

Total equity investments in affiliates
 
 
$
1,038


(a) Equity method investments owned by NRG Yield
(b) Gladstone Power Station is located in Australia
(c) Economic interest based on cash to be distributed
(d) Refer to Note 10 - Asset Impairments for discussion of NRG's investment in Petra Nova Parish Holdings, LLC.

Undistributed earnings by equity investment
 
As of December 31,
 
2017
 
2016
 
(In millions)
Undistributed earnings from equity investments
$
120

 
$
101
Summary of Financial Information for Consolidated VIEs
The summarized financial information for the Company's consolidated VIEs consisted of the following:
(In millions)
December 31, 2017
 
December 31, 2016
Current assets
$
118

 
$
87

Net property, plant and equipment
2,337

 
1,534

Other long-term assets
658

 
954

Total assets
3,113


2,575

Current liabilities
96

 
59

Long-term debt
661

 
442

Other long-term liabilities
209

 
183

Total liabilities
966


684

Redeemable noncontrolling interests
78

 
46

Noncontrolling interests
507

 
529

Net assets less noncontrolling interests
$
1,562


$
1,316