Segment and Significant Customer Information

3 Months Ended

Mar. 31, 2013

Segment and Significant Customer Information [Abstract]

Segment and Significant Customer Information

Segment 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 March 31, 2013, 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).

	Three Months Ended March 31, 2013
	West			Texas			North			Southeast			Consolidation and Elimination			Total
Revenues from external customers	$	383		$	407		$	306		$	145		$	—		$	1,241
Intersegment revenues	1			7			7			33			(48		)	—
Total operating revenues	$	384		$	414		$	313		$	178		$	(48	)	$	1,241
Commodity Margin	$	202		$	76		$	142		$	41		$	—		$	461
Add: Unrealized mark-to-market commodity activity, net and other(1)	(37		)	(11		)	7			7			(7		)	(41		)
Less:
Plant operating expense	93			68			44			30			(8		)	227
Depreciation and amortization expense	51			43			33			19			—			146
Sales, general and other administrative expense	4			17			6			5			1			33
Other operating expenses	9			1			7			2			(1		)	18
(Income) from unconsolidated investments in power plants	—			—			(8		)	—			—			(8		)
Income (loss) from operations	8			(64		)	67			(8		)	1			4
Interest expense, net of interest income																174
Other (income) expense, net																5
Loss before income taxes																$	(175	)

	Three Months Ended March 31, 2012
	West		Texas		North			Southeast		Consolidation and Elimination			Total
Revenues from external customers	$	416	$	356	$	298		$	166	$	—		$	1,236
Intersegment revenues	4		20		3			22		(49		)	—
Total operating revenues	$	420	$	376	$	301		$	188	$	(49	)	$	1,236
Commodity Margin(2)(3)	$	208	$	109	$	144		$	56	$	—		$	517
Add: Unrealized mark-to-market commodity activity, net and other(1)	36		34		12			10		(8		)	84
Less:
Plant operating expense	81		68		45			33		(6		)	221
Depreciation and amortization expense	50		35		33			23		(1		)	140
Sales, general and other administrative expense	8		11		6			8		—			33
Other operating expenses	11		2		9			1		(2		)	21
(Income) from unconsolidated investments in power plants	—		—		(9		)	—		—			(9		)
Income from operations	94		27		72			1		1			195
Interest expense, net of interest income													182
Loss on interest rate derivatives													14
Debt extinguishment costs and other (income) expense, net													14
Loss before income taxes													$	(15	)

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(1) Includes $(16) million and $(8) million of lease levelization and $4 million and $4 million of amortization expense for the three months ended March 31, 2013 and 2012, respectively.

(2) Our North segment includes Commodity Margin of $8 million for the three months ended March 31, 2012 related to Riverside Energy Center, LLC, which was sold in December 2012.

(3) Our Southeast segment includes Commodity Margin of $11 million for the three months ended March 31, 2012 related to Broad River, which was sold in December 2012.