Segment and Significant Customer Information (Tables)

12 Months Ended

Dec. 31, 2012

Segment and Significant Customer Information [Abstract]

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.

- 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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