The tables below show our financial data for our segments for the periods indicated (in millions).



	Three Months Ended September 30, 2015
	West		Texas			East			Consolidation and Elimination			Total
Revenues from external customers	$	736	$	709		$	503		$	—		$	1,948
Intersegment revenues	1		4			3			(8		)	—
Total operating revenues	$	737	$	713		$	506		$	(8	)	$	1,948
Commodity Margin	$	385	$	264		$	325		$	—		$	974
Add: Mark-to-market commodity activity, net and other⁽¹⁾	68		(98		)	(62		)	(7		)	(99		)
Less:
Plant operating expense	87		62			57			(6		)	200
Depreciation and amortization expense	61		58			48			(1		)	166
Sales, general and other administrative expense	7		15			10			1			33
Other operating expenses	8		2			8			(2		)	16
(Income) from unconsolidated investments in power plants	—		—			(6		)	—			(6		)
Income from operations	290		29			146			1			466
Interest expense, net of interest income												158
Other (income) expense, net												1
Income before income taxes												$	307



	Three Months Ended September 30, 2014
	West		Texas			East			Consolidation and Elimination			Total
Revenues from external customers	$	714	$	985		$	488		$	—		$	2,187
Intersegment revenues	1		4			2			(7		)	—
Total operating revenues	$	715	$	989		$	490		$	(7	)	$	2,187
Commodity Margin⁽²⁾	$	361	$	346		$	237		$	—		$	944
Add: Mark-to-market commodity activity, net and other⁽¹⁾	41		(64		)	4			(6		)	(25		)
Less:
Plant operating expense	91		77			55			(8		)	215
Depreciation and amortization expense	65		51			38			(1		)	153
Sales, general and other administrative expense	11		18			8			—			37
Other operating expenses	12		1			6			4			23
Impairment losses	—		—			123			—			123
(Gain) on sale of assets, net	—		—			(753		)	—			(753		)
(Income) from unconsolidated investments in power plants	—		—			(5		)	—			(5		)
Income from operations	223		135			769			(1		)	1,126
Interest expense, net of interest income												154
Debt extinguishment costs and other (income) expense, net												344
Income before income taxes												$	628



	Nine Months Ended September 30, 2015
	West		Texas			East			Consolidation and Elimination			Total
Revenues from external customers	$	1,672	$	1,860		$	1,504		$	—		$	5,036
Intersegment revenues	3		12			7			(22		)	—
Total operating revenues	$	1,675	$	1,872		$	1,511		$	(22	)	$	5,036
Commodity Margin	$	843	$	583		$	740		$	—		$	2,166
Add: Mark-to-market commodity activity, net and other⁽³⁾	173		(47		)	(84		)	(21		)	21
Less:
Plant operating expense	313		233			206			(20		)	732
Depreciation and amortization expense	193		157			135			(1		)	484
Sales, general and other administrative expense	23		47			29			1			100
Other operating expenses	28		6			24			(2		)	56
(Income) from unconsolidated investments in power plants	—		—			(18		)	—			(18		)
Income from operations	459		93			280			1			833
Interest expense, net of interest income												468
Debt modification and extinguishment costs and other (income) expense, net												40
Income before income taxes												$	325



	Nine Months Ended September 30, 2014
	West		Texas		East			Consolidation and Elimination			Total
Revenues from external customers	$	1,692	$	2,592	$	1,807		$	—		$	6,091
Intersegment revenues	4		19		46			(69		)	—
Total operating revenues	$	1,696	$	2,611	$	1,853		$	(69	)	$	6,091
Commodity Margin⁽²⁾	$	791	$	644	$	786		$	—		$	2,221
Add: Mark-to-market commodity activity, net and other⁽³⁾	91		74		(31		)	(23		)	111
Less:
Plant operating expense	291		250		237			(24		)	754
Depreciation and amortization expense	183		141		129			—			453
Sales, general and other administrative expense	28		48		32			—			108
Other operating expenses	39		4		22			1			66
Impairment losses	—		—		123			—			123
(Gain) on sale of assets, net	—		—		(753		)	—			(753		)
(Income) from unconsolidated investments in power plants	—		—		(18		)	—			(18		)
Income from operations	341		275		983			—			1,599
Interest expense, net of interest income											486
Debt extinguishment costs and other (income) expense, net											361
Income before income taxes											$	752

_________


(1)	Includes $41 million and $49 million of lease levelization and $4 million and $4 million of amortization expense for the three months ended September 30, 2015 and 2014, respectively.


(2)	Commodity Margin related to the six power plants sold in our East segment on July 3, 2014, was not significant for the three months ended September 30, 2014. The Commodity Margin related to those power plants was $81 million for the nine months ended September 30, 2014.


(3)	Includes $(1) million and $(7) million of lease levelization and $11 million and $11 million of amortization expense for the nine months ended September 30, 2015 and 2014, respectively.