Exhibit 12

Nicor Gas Company

Statement Setting Forth Ratio of Earnings to Fixed Charges

	Nine months ended		Fiscal		Fiscal		Fiscal		Fiscal		Fiscal
Dollars in millions	September 30, 2012		2011		2010		2009		2008		2007
Net income	$	36	$	50	$	101	$	75	$	60	$	66
Add:
Interest Tax Expense		24		28		59		40		31		34
Fixed charges (see “B” below)		23		35		37		35		38		41
Adjusted Earnings (A)	$	83	$	113	$	197	$	150	$	129	$	141
Fixed charges
Interest on debt	$	22	$	33	$	35	$	33	$	35	$	38
Other interest, including amortized premiums, discounts and capitalized expenses related to indebtedness liability		1		2		2		2		3		3
Total fixed charges (B)	$	23	$	35	$	37	$	35	$	38	$	41
Ratio of earnings to fixed charges (A)/(B)		3.61		3.23		5.38		4.30		3.37		3.45