Segment Information (Tables)

6 Months Ended

Jun. 30, 2011


	Three Months Ended June 30, 2011
	West		Texas		North		Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	466	$	646	$	324	$	197		$	—		$	1,633
Intersegment revenues		1		5		5		40			(51	)		—
Total operating revenues	$	467	$	651	$	329	$	237		$	(51	)	$	1,633
Commodity Margin	$	236	$	128	$	179	$	59		$	—		$	602
Add: Mark-to-market commodity activity, net and other revenue(1)		11		27		—		—			(9	)		29
Less:
Plant operating expense		116		63		47		41			(6	)		261
Depreciation and amortization expense		42		35		33		22			(1	)		131
Sales, general and other administrative expense		8		13		6		6			1			34
Other operating expenses(2)		11		3		9		2			(5	)		20
Loss from unconsolidated investments in power plants		—		—		2		—			—			2
Income (loss) from operations		70		41		82		(12	)		2			183
Interest expense, net of interest income														190
(Gain) loss on interest rate derivatives, net														37
Debt extinguishment costs and other (income) expense, net														8
Loss before income taxes and discontinued operations													$	(52	)

Segment tables


	Three Months Ended June 30, 2010
	West		Texas			North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	525	$	552		$	134		$	219		$	—		$	1,430
Intersegment revenues		1		6			1			21			(29	)		—
Total operating revenues	$	526	$	558		$	135		$	240		$	(29	)	$	1,430
Commodity Margin	$	258	$	128		$	79		$	68		$	—		$	533
Add: Mark-to-market commodity activity, net and other revenue(1)		10		(10	)		3			(9	)		(6	)		(12	)
Less:
Plant operating expense		88		78			23			31			(7	)		213
Depreciation and amortization expense		50		40			19			27			(1	)		135
Sales, general and other administrative expense		11		16			22			2			(1	)		50
Other operating expenses(2)		12		(5	)		7			(1	)		8			21
(Income) from unconsolidated investments in power plants		—		—			(6	)		—			—			(6	)
Income (loss) from operations		107		(11	)		17			—			(5	)		108
Interest expense, net of interest income																220
(Gain) loss on interest rate derivatives, net																(8	)
Debt extinguishment costs and other (income) expense, net																8
Loss before income taxes and discontinued operations															$	(112	)

Segment tables


	Six Months Ended June 30, 2011
	West		Texas			North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	1,065	$	1,096		$	595		$	376		$	—		$	3,132
Intersegment revenues		4		10			13			85			(112	)		—
Total operating revenues	$	1,069	$	1,106		$	608		$	461		$	(112	)	$	3,132
Commodity Margin	$	469	$	195		$	314		$	113		$	—		$	1,091
Add: Mark-to-market commodity activity, net and other revenue(1)		16		(33	)		4			(4	)		(15	)		(32	)
Less:
Plant operating expense		203		143			92			74			(13	)		499
Depreciation and amortization expense		88		65			66			45			(2	)		262
Sales, general and other administrative expense		19		23			12			11			1			66
Other operating expenses(2)		19		3			16			3			(3	)		38
(Income) from unconsolidated investments in power plants		—		—			(7	)		—			—			(7	)
Income (loss) from operations		156		(72	)		139			(24	)		2			201
Interest expense, net of interest income																378
(Gain) loss on interest rate derivatives, net																146
Debt extinguishment costs and other (income) expense, net																108
Loss before income taxes and discontinued operations															$	(431	)

Segment tables


	Six Months Ended June 30, 2010
	West		Texas		North			Southeast		Consolidation and Elimination			Total
Revenues from external customers	$	1,190	$	1,079	$	257		$	418	$	—		$	2,944
Intersegment revenues		5		10		2			44		(61	)		—
Total operating revenues	$	1,195	$	1,089	$	259		$	462	$	(61	)	$	2,944
Commodity Margin	$	471	$	235	$	131		$	126	$	—		$	963
Add: Mark-to-market commodity activity, net and other revenue(1)		18		86		—			13		(14	)		103
Less:
Plant operating expense		178		162		45			59		(13	)		431
Depreciation and amortization expense		103		76		39			56		(3	)		271
Sales, general and other administrative expense		26		16		25			6		(1	)		72
Other operating expenses(2)		29		2		15			2		(1	)		47
(Income) from unconsolidated investments in power plants		—		—		(13	)		—		—			(13	)
Income from operations		153		65		20			16		4			258
Interest expense, net of interest income														399
(Gain) loss on interest rate derivatives, net														3
Debt extinguishment costs and other (income) expense, net														13
Loss before income taxes and discontinued operations													$	(157	)

_________

(1)	Mark-to-market commodity activity represents the unrealized portion of our mark-to-market activity, net, included in operating revenues and fuel and purchased energy expense on our Consolidated Condensed Statements of Operations.

(2)	Excludes $2 million and $5 million of RGGI compliance and other environmental costs for the three months ended June 30, 2011 and 2010, respectively, and $4 million and $5 million for the six months ended June 30, 2011 and 2010, respectively, which are included as a component of Commodity Margin.

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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