v2.4.0.6
Segment and Significant Customer Information
 12 Months Ended
Dec. 31, 2012
Segment and Significant Customer Information [Abstract]  
Segment and Significant Customer Information
Segment and Significant Customer Information
We assess our business on a regional basis due to the impact on our financial performance of the differing characteristics of these regions, particularly with respect to competition, regulation and other factors impacting supply and demand. At December 31, 2012, our reportable segments were West (including geothermal), Texas, North (including Canada) and Southeast. We continue to evaluate the optimal manner in which we assess our performance including our segments and future changes may result.
Commodity Margin is a key operational measure reviewed by our chief operating decision maker to assess the performance of our segments. The tables below show our financial data for our segments for the periods indicated (in millions).
 
Year Ended December 31, 2012
 
West
 
Texas
 
North
 
Southeast
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
1,668

 
$
1,857

 
$
1,280

 
$
673

 
$
—

 
$
5,478

Intersegment revenues
10

 
61

 
14

 
80

 
(165
)
 
—

Total operating revenues
$
1,678

 
$
1,918

 
$
1,294

 
$
753

 
$
(165
)
 
$
5,478

Commodity Margin (1)(2)
$
994

 
$
570

 
$
729

 
$
245

 
$
—

 
$
2,538

Add: Unrealized mark-to-market commodity activity, net and other(3)
(93
)
 
87

 
(14
)
 
(33
)
 
(31
)
 
(84
)
Less:
 
 
 
 
 
 
 
 
 
 
 
Plant operating expense
368

 
247

 
206

 
131

 
(30
)
 
922

Depreciation and amortization expense
203

 
142

 
134

 
85

 
(2
)
 
562

Sales, general and other administrative expense
36

 
47

 
28

 
29

 
—

 
140

Other operating expenses
42

 
5

 
29

 
5

 
(3
)
 
78

(Gain) on sale of assets, net
—

 
—

 
(7
)
 
(215
)
 
—

 
(222
)
(Income) from unconsolidated investments in power plants
—

 
—

 
(28
)
 
—

 
—

 
(28
)
Income from operations
252

 
216

 
353

 
177

 
4

 
1,002

Interest expense, net of interest income
 
 
 
 
 
 
 
 
 
 
725

Loss on interest rate derivatives
 
 
 
 
 
 
 
 
 
 
14

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
 
 
45

Income before income taxes and discontinued operations
 
 
 
 
 
 
 
 
 
 
$
218


 
Year Ended December 31, 2011
 
West
 
Texas
 
North
 
Southeast
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
2,372

 
$
2,306

 
$
1,336

 
$
786

 
$
—

 
$
6,800

Intersegment revenues
12

 
23

 
7

 
135

 
(177
)
 
—

Total operating revenues
$
2,384

 
$
2,329

 
$
1,343

 
$
921

 
$
(177
)
 
$
6,800

Commodity Margin(1)(2)
$
1,061

 
$
469

 
$
704

 
$
240

 
$
—

 
$
2,474

Add: Unrealized mark-to-market commodity activity, net and other(3)
113

 
(102
)
 
(13
)
 
1

 
(32
)
 
(33
)
Less:
 
 
 
 
 
 
 
 
 
 
 
Plant operating expense
380

 
235

 
177

 
141

 
(29
)
 
904

Depreciation and amortization expense
192

 
135

 
138

 
90

 
(5
)
 
550

Sales, general and other administrative expense
43

 
43

 
24

 
22

 
(1
)
 
131

Other operating expenses
41

 
3

 
30

 
5

 
(2
)
 
77

(Income) from unconsolidated investments in power plants
—

 
—

 
(21
)
 
—

 
—

 
(21
)
Income (loss) from operations
518

 
(49
)
 
343

 
(17
)
 
5

 
800

Interest expense, net of interest income
 
 
 
 
 
 
 
 
 
 
751

Loss on interest rate derivatives
 
 
 
 
 
 
 
 
 
 
145

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
 
 
115

Loss before income taxes and discontinued operations
 
 
 
 
 
 
 
 
 
 
$
(211
)

 
Year Ended December 31, 2010
 
West
 
Texas
 
North
 
Southeast
 
Consolidation
and
Elimination
 
Total
Revenues from external customers
$
2,525

 
$
2,162

 
$
978

 
$
880

 
$
—

 
$
6,545

Intersegment revenues
12

 
22

 
6

 
138

 
(178
)
 
—

Total operating revenues
$
2,537

 
$
2,184

 
$
984

 
$
1,018

 
$
(178
)
 
$
6,545

Commodity Margin(1)(2)
$
1,080

 
$
504

 
$
535

 
$
272

 
$
—

 
$
2,391

Add: Unrealized mark-to-market commodity activity, net and other
69

 
89

 
21

 
22

 
(30
)
 
171

Less:
 
 
 
 
 
 
 
 
 
 
 
Plant operating expense
351

 
285

 
138

 
123

 
(29
)
 
868

Depreciation and amortization expense
207

 
150

 
111

 
109

 
(7
)
 
570

Sales, general and other administrative expense
55

 
38

 
45

 
12

 
1

 
151

Other operating expenses
59

 
2

 
28

 
4

 
(2
)
 
91

Impairment losses
97

 
—

 
—

 
19

 
—

 
116

(Gain) on sale of assets, net
—

 
(119
)
 
—

 
—

 
—

 
(119
)
(Income) from unconsolidated investments in power plants
—

 
—

 
(16
)
 
—

 
—

 
(16
)
Income from operations
380

 
237

 
250

 
27

 
7

 
901

Interest expense, net of interest income
 
 
 
 
 
 
 
 
 
 
802

Loss on interest rate derivatives
 
 
 
 
 
 
 
 
 
 
223

Debt extinguishment costs and other (income) expense, net
 
 
 
 
 
 
 
 
 
 
106

Loss before income taxes and discontinued operations
 
 
 
 
 
 
 
 
 
 
$
(230
)
__________
(1)
Our North segment includes Commodity Margin related to Riverside Energy Center, LLC of $73 million , $70 million and $73 million for the years ended December 31, 2012, 2011 and 2010, respectively.
(2)
Our Southeast segment includes Commodity Margin related to Broad River of $52 million, $51 million and $55 million for the years ended December 31, 2012, 2011 and 2010, respectively.
(3)
Includes $1 million and $12 million of lease levelization and $14 million and $8 million of amortization expense for the years ended December 31, 2012 and 2011, respectively, related to contracts that became effective in 2011.
Significant Customer
For the years ended December 31, 2012 and 2011, we had one significant customer, PJM Settlement, Inc., that accounted for more than 10% of our annual consolidated revenues. Our revenues of $713 million and $742 million from PJM Settlement, Inc. for the years ended December 31, 2012 and 2011, respectively, were attributed to our North segment. Our receivables from PJM Settlement, Inc. were $37 million and $28 million as of December 31, 2012 and 2011, respectively. We did not have a customer that accounted for more than 10% of our annual consolidated revenues for the year ended December 31, 2010.