EXHIBIT 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

The ratio of earnings to fixed charges is calculated using the Securities and Exchange Commission guidelines.

	Successor(1)				Predecessor(1)
	Twelve months ended December 31, 2007		Nine months ended December 31, 2006		Three months ended March 31, 2006		Twelve months ended December 31, 2005		Twelve months ended December 31, 2004		Twelve months ended December 31, 2003
	(in millions)
Earnings as defined for fixed charges calculation
Add:
Pretax income from continuing operations	$	415	$	102	$	186	$	412	$	378	$	460
Fixed charges		139		100		35		114		106		134
Deduct:
Interest capitalized(a)		30		14		3		7		5		9
Total earnings (as defined for the Fixed Charges calculation)	$	524	$	188	$	218	$	519	$	479	$	585
Fixed charges:
Interest on debt, including capitalized portions	$	130	$	95	$	33	$	105	$	95	$	124
Estimate of interest within rental expense		9		5		2		9		11		10
Total fixed charges	$	139	$	100	$	35	$	114	$	106	$	134
Ratio of earnings to fixed charges		3.8		1.9		6.2		4.6		4.5		4.4

(a) Excludes equity costs related to AFUDC that are included in Other Income and Expenses in the Consolidated Statements of Operations.

(1) See Note 1 for additional information on Predecessor and Successor reporting.