Exhibit 12.2

Exelon Generation Company, LLC

Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2005		2006		2007		2008		2009
Pre-tax income from continuing operations before adjustment for income or loss from equity investees and minority interest	1,818		2,269		3,387		3,388		3,555
Plus: (Income) or loss from equity investees	1		9		(1	)	1		3
Less: Capitalized interest	(12	)	(21	)	(30	)	(33	)	(49	)
Pre-tax income from continuing operations after adjustment for income or loss from equity investees, minority interest and capitalized interest	1,807		2,257		3,356		3,356		3,509
Fixed charges:
Interest expensed and capitalized, amortization of debt discount and premium on all indebtness	140		180		196		170		162	(a)
Interest component of rental expense (b)	266		242		273		272		212
Total fixed charges	406		422		469		442		374
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest plus fixed charges	2,213		2,679		3,825		3,798		3,883
Ratio of earnings to fixed charges	5.5		6.3		8.2		8.6		10.4

(a) Includes interest expense of $9 million, $0 and $24 million for the years ended December 31, 2009, 2008 and 2007, respectively, related to uncertain income tax positions.

(b) Represents one-third of rental expense relating to operating leases, which is a reasonable approximation of the interest factor.