Nicor Gas Company

Form 10-Q

Exhibit 12.01

Nicor Gas Company
Computation of Consolidated Ratio of Earnings to Fixed Charges
(thousands)


	Three			Twelve
	months ended			months ended
	September 30			September 30			Year Ended December 31
	2011			2011			2010			2009			2008			2007			2006

Earnings available to cover fixed charges:

Net income	$	8,206		$	86,308		$	100,871		$	74,960		$	59,569		$	66,277		$	58,656

Add: Income tax expense		5,372			51,471			59,264			40,316			30,991			34,197			27,814

Fixed charges		8,134			34,230			36,585			34,933			38,246			41,000			45,041

Allowance for funds used during construction and other		(9	)		(21	)		-			(51	)		(62	)		(182	)		(614	)

	$	21,703		$	171,988		$	196,720		$	150,158		$	128,744		$	141,292		$	130,897


Fixed charges:

Interest on debt	$	7,690		$	32,518		$	34,855		$	32,991		$	35,204		$	37,515		$	37,665

Other interest charges and amortization of debt
discount, premium, and expense, net		444	*		1,712	*		1,730	*		1,942	*		3,042	*		3,485	*		7,376

	$	8,134		$	34,230		$	36,585		$	34,933		$	38,246		$	41,000		$	45,041


Ratio of earnings to fixed charges		2.67			5.02			5.38			4.30			3.37			3.45			2.91

* The Company began accruing interest expense for uncertain tax positions on January 1, 2007. Accordingly, for 2007 and going forward, the interest included in Fixed charges is only the interest on third party indebtedness. Any interest expense accrued on uncertain tax positions is excluded from the calculation of Earnings. Prior years' calculations were not changed.

NORTHERN ILLINOIS GAS CO /IL/ /NEW/ 10-Q