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Segment Reporting
12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Segment Reporting
Segment Reporting
2012 Business Segment Realignment
Effective in fiscal year 2012, NRG's segment structure and its allocation of corporate expenses were updated to reflect how management currently makes financial decisions and allocates resources. The Company has recast the data from prior periods to reflect this change in reportable segments to conform to the current year presentation. The Company's businesses are primarily segregated based on the Retail Business, conventional power generation, alternative energy businesses and corporate activities.  Within NRG's conventional power generation operations, there are distinct components with separate operating results and management structures for the following geographical regions: Texas, East, South Central, West, and Other, which includes its international businesses, thermal and chilled water business and maintenance services.  The Company's alternative energy businesses include solar and wind assets, electric vehicle services and carbon capture business. 
For the years ended December 31, 2012, 2011, and 2010, there were no customers from whom the Company derived more than 10% of the Company's consolidated revenues.
 
Year Ended December 31, 2012
 
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
 
Retail(a)
 
Texas(a)
 
East(a)(b)
 
South
Central(b)
 
West(b)
 
Other(a)
 
Alternative Energy(a)
 
Corporate
 
Elimination
 
Total
 
(In millions)
Operating revenues
$
5,772

 
$
2,074

 
$
854

 
$
807

 
$
259

 
$
320

 
$
153

 
$
17

 
$
(1,834
)
 
$
8,422

Operating expenses
5,065

 
1,712

 
754

 
695

 
194

 
273

 
86

 
55

 
(1,819
)
 
7,015

Depreciation and amortization
162

 
458

 
137

 
93

 
12

 
17

 
59

 
12

 

 
950

Acquisition-related transaction and integration costs

 

 

 

 

 

 

 
107

 

 
107

Operating income/(loss)
545

 
(96
)
 
(37
)
 
19

 
53

 
30

 
8

 
(157
)
 
(15
)
 
350

Equity in earnings/(loss) of unconsolidated affiliates

 

 
16

 

 
7

 
13

 
3

 
(2
)
 

 
37

Impairment charge on investment

 

 

 

 

 

 

 
(2
)
 

 
(2
)
Bargain purchase gain related to GenOn acquisition

 

 

 

 

 

 

 
560

 

 
560

Other income, net

 
2

 
2

 
1

 
1

 
4

 
1

 
26

 
(18
)
 
19

Loss on debt extinguishment and refinancing expense


 


 


 


 


 


 


 
(51
)
 


 
(51
)
Interest expense
(4
)
 

 
(20
)
 
(18
)
 
(2
)
 
(11
)
 
(46
)
 
(578
)
 
18

 
(661
)
Income/(loss) before income taxes
541

 
(94
)
 
(39
)
 
2

 
59

 
36

 
(34
)
 
(204
)
 
(15
)
 
252

Income tax expense/(benefit)

 

 

 

 

 
3

 

 
(330
)
 

 
(327
)
Net income/(loss)
$
541

 
$
(94
)
 
$
(39
)
 
$
2

 
$
59

 
$
33

 
$
(34
)
 
$
126

 
$
(15
)
 
$
579

Less: Net income attributable to noncontrolling interest
$

 
$

 
$

 
$

 
$

 
$

 
$
20

 
$

 
$

 
$
20

Net income/(loss) attributable to NRG Energy, Inc.
$
541

 
$
(94
)
 
$
(39
)
 
$
2

 
$
59

 
$
33

 
$
(54
)
 
$
126

 
$
(15
)
 
$
559

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance sheet
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Equity investments in affiliates
$

 
$

 
$
131

 
$
19

 
$
27

 
$
322

 
$
167

 
$
10

 
$

 
$
676

Capital expenditures (c)
22

 
118

 
70

 
36

 
244

 
41

 
3,153

 
9

 

 
3,693

Goodwill
231

 
1,713

 

 

 

 

 
12

 

 

 
1,956

Total assets
$
3,122

 
$
10,988

 
$
5,249

 
$
1,969

 
$
1,825

 
$
794

 
$
6,157

 
$
29,042

 
$
(24,018
)
 
$
35,128

(a) Includes intersegment sales of:
$
5

 
$
1,657

 
$
73

 
$

 
$

 
$
69

 
$
20

 
$
10


(b) Includes GenOn results for the period December 15, 2012 to December 31, 2012.
(c) Includes accruals.
 
Year Ended December 31, 2011
 
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
 
Retail(d)(e)
 
Texas(d)
 
East(d)
 
South
Central
 
West
 
Other(d)
 
Alternative Energy(d)
 
Corporate
 
Elimination
 
Total
 
(In millions)
Operating revenues
$
5,642

 
$
2,832

 
$
924

 
$
817

 
$
149

 
$
323

 
$
44

 
$
11

 
$
(1,663
)
 
$
9,079

Operating expenses
5,113

 
1,910

 
858

 
703

 
92

 
282

 
63

 
30

 
(1,663
)
 
7,388

Depreciation and amortization
159

 
463

 
118

 
89

 
10

 
14

 
31

 
12

 

 
896

Impairment charge on emission allowances

 
160

 

 

 

 

 

 

 

 
160

Operating income/(loss)
370

 
299

 
(52
)
 
25

 
47

 
27

 
(50
)
 
(31
)
 

 
635

Equity in earnings of unconsolidated affiliates

 

 
11

 

 
9

 
9

 
6

 

 

 
35

Impairment charge on investment

 

 

 

 

 

 

 
(495
)
 

 
(495
)
Other income, net

 
1

 
2

 
2

 

 
5

 
3

 
21

 
(15
)
 
19

Loss on debt extinguishment and refinancing expense

 

 

 

 

 

 

 
(175
)
 

 
(175
)
Interest (expense)/income
(4
)
 
16

 
(47
)
 
(41
)
 
(2
)
 
(15
)
 
(16
)
 
(571
)
 
15

 
(665
)
Income/(loss) before income taxes
366

 
316

 
(86
)
 
(14
)
 
54

 
26

 
(57
)
 
(1,251
)
 

 
(646
)
Income tax (benefit)/expense
(3
)
 

 

 

 

 
7

 

 
(847
)
 

 
(843
)
Net income/(loss)
369

 
316

 
(86
)
 
(14
)
 
54

 
19

 
(57
)
 
(404
)
 

 
197

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance sheet
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Equity investments in affiliates
$

 
$

 
$
136

 
$

 
$
28

 
$
308

 
$
168

 
$

 
$

 
$
640

Capital expenditures (f)
23

 
99

 
188

 
25

 
281

 
40

 
1,809

 
137

 

 
2,602

Goodwill
173

 
1,713

 

 

 

 

 

 

 

 
1,886

Total assets
$
2,725

 
$
13,164

 
$
2,042

 
$
1,436

 
$
669

 
$
1,006

 
$
3,143

 
$
19,732

 
$
(17,017
)
 
$
26,900


(d) Includes intersegment sales of:
$
5

 
$
1,586

 
$
43

 
$

 
$

 
$
18

 
$
16

 
$


(e) Includes Green Mountain Energy results and Energy Plus results for the period October 1, 2011 to December 31, 2011.
(f) Includes accruals.
 
Year Ended December 31, 2010
 
 
 
Conventional Power Generation
 
 
 
 
 
 
 
 
 
Retail(g)(h)
 
Texas(g)
 
East
 
South
Central
 
West
 
Other(g)
 
Alternative Energy(g)
 
Corporate
 
Elimination
 
Total
 
 
 
(In millions)
Operating revenues
$
5,055

 
$
3,040

 
$
1,025

 
$
608

 
$
138

 
$
301

 
$
41

 
$
1

 
$
(1,360
)
 
$
8,849

Operating expenses
4,547

 
1,749

 
847

 
506

 
98

 
260

 
38

 
41

 
(1,360
)
 
6,726

Depreciation and amortization
127

 
466

 
122

 
67

 
9

 
12

 
27

 
8

 

 
838

Gain on sale of asset

 

 

 

 

 

 

 
23

 

 
23

Operating income/(loss)
381

 
825

 
56

 
35

 
31

 
29

 
(24
)
 
(25
)
 

 
1,308

Equity in earnings/(loss) of
unconsolidated affiliates

 

 
1

 

 
6

 
24

 
14

 
(1
)
 

 
44

Other income, net

 
2

 
4

 
1

 
1

 
18

 

 
24

 
(17
)
 
33

Loss on debt extinguishment and refinancing expense

 

 

 

 

 

 

 
(2
)
 

 
(2
)
Interest (expense)/income
(5
)
 
79

 
(57
)
 
(46
)
 
(2
)
 
(14
)
 
(13
)
 
(589
)
 
17

 
(630
)
Income/(loss) before income taxes
376

 
906

 
4

 
(10
)
 
36

 
57

 
(23
)
 
(593
)
 

 
753

Income tax expense

 

 

 

 

 
17

 

 
260

 

 
277

Net income/(loss)
376

 
906

 
4

 
(10
)
 
36

 
40

 
(23
)
 
(853
)
 

 
476

Less: Net loss attributable to noncontrolling interest

 
(1
)
 

 

 

 

 

 

 

 
(1
)
Net income/(loss) attributable to NRG Energy, Inc
376

 
907

 
4

 
(10
)
 
36

 
40

 
(23
)
 
(853
)
 

 
477

(g) Includes intersegment sales of:
$
2

 
$
1,304

 
$

 
$

 
$

 
$
25

 
$
23

 
$


(h) Includes Green Mountain Energy results for the period November 5, 2010 to December 31, 2010.