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



	Three Months Ended September 30, 2013
	West		Texas			North			Southeast		Consolidation and Elimination			Total
Revenues from external customers	$	620	$	842		$	401		$	187	$	—		$	2,050
Intersegment revenues	1		(6		)	12			57		(64		)	—
Total operating revenues	$	621	$	836		$	413		$	244	$	(64	)	$	2,050
Commodity Margin	$	337	$	328		$	242		$	78	$	—		$	985
Add: Unrealized mark-to-market commodity activity, net and other⁽¹⁾	16		(5		)	(3		)	6		(8		)	6
Less:
Plant operating expense	80		60			40			27		(7		)	200
Depreciation and amortization expense	57		42			33			18		—			150
Sales, general and other administrative expense	4		17			6			5		1			33
Other operating expenses	11		2			9			1		(3		)	20
(Income) from unconsolidated investments in power plants	—		—			(9		)	—		—			(9		)
Income from operations	201		202			160			33		1			597
Interest expense, net of interest income														174
Other (income) expense, net														7
Income before income taxes														$	416



	Three Months Ended September 30, 2012
	West			Texas			North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	509		$	886		$	407		$	194		$	—		$	1,996
Intersegment revenues	2			(34		)	4			68			(40		)	—
Total operating revenues	$	511		$	852		$	411		$	262		$	(40	)	$	1,996
Commodity Margin⁽²⁾⁽³⁾	$	330		$	218		$	266		$	83		$	—		$	897
Add: Unrealized mark-to-market commodity activity, net and other⁽¹⁾	(40		)	249			(26		)	27			(8		)	202
Less:
Plant operating expense	88			49			51			29			(10		)	207
Depreciation and amortization expense	52			35			33			21			(1		)	140
Sales, general and other administrative expense	9			12			8			8			(1		)	36
Other operating expenses	10			1			6			(1		)	2			18
(Income) from unconsolidated investments in power plants	—			—			(7		)	—			—			(7		)
Income from operations	131			370			149			53			2			705
Interest expense, net of interest income																181
Other (income) expense, net																6
Income before income taxes																$	518



	Nine Months Ended September 30, 2013
	West			Texas			North			Southeast		Consolidation and Elimination			Total
Revenues from external customers	$	1,482		$	1,820		$	1,055		$	506	$	—		$	4,863
Intersegment revenues	2			(24		)	27			161		(166		)	—
Total operating revenues	$	1,484		$	1,796		$	1,082		$	667	$	(166	)	$	4,863
Commodity Margin	$	737		$	537		$	543		$	162	$	—		$	1,979
Add: Unrealized mark-to-market commodity activity, net and other⁽⁴⁾	(2		)	18			(8		)	20		(24		)	4
Less:
Plant operating expense	261			224			130			92		(23		)	684
Depreciation and amortization expense	160			129			98			55		(1		)	441
Sales, general and other administrative expense	11			55			18			17		1			102
Other operating expenses	31			4			23			2		(2		)	58
(Income) from unconsolidated investments in power plants	—			—			(25		)	—		—			(25		)
Income from operations	272			143			291			16		1			723
Interest expense, net of interest income															517
Debt extinguishment costs and other (income) expense, net															83
Income before income taxes															$	123



	Nine Months Ended September 30, 2012
	West			Texas		North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	1,183		$	1,430	$	974		$	524		$	—		$	4,111
Intersegment revenues	7			27		9			84			(127		)	—
Total operating revenues	$	1,190		$	1,457	$	983		$	608		$	(127	)	$	4,111
Commodity Margin⁽²⁾⁽³⁾	$	748		$	472	$	591		$	212		$	—		$	2,023
Add: Unrealized mark-to-market commodity activity, net and other⁽⁴⁾	(80		)	66		(17		)	(5		)	(22		)	(58		)
Less:
Plant operating expense	281			189		154			98			(23		)	699
Depreciation and amortization expense	151			104		100			66			(3		)	418
Sales, general and other administrative expense	23			36		22			23			—			104
Other operating expenses	30			4		21			2			1			58
(Income) from unconsolidated investments in power plants	—			—		(21		)	—			—			(21		)
Income from operations	183			205		298			18			3			707
Interest expense, net of interest income															545
Loss on interest rate derivatives															14
Debt extinguishment costs and other (income) expense, net															26
Income before income taxes															$	122

_________


(1)	Includes $44 million and $16 million of lease levelization and $4 million and $4 million of amortization expense for the three months ended September 30, 2013 and 2012, respectively.


(2)	Our North segment includes Commodity Margin of $32 million and $64 million for the three and nine months ended September 30, 2012 related to Riverside Energy Center, LLC, which was sold in December 2012.


(3)	Our Southeast segment includes Commodity Margin of $20 million and $44 million for the three and nine months ended September 30, 2012 related to Broad River, which was sold in December 2012.


(4)	Includes $17 million and $7 million of lease levelization and $11 million and $11 million of amortization expense for the nine months ended September 30, 2013 and 2012, respectively.