Exhibit 12.2

Exelon Generation Company, LLC

Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2009			2010			2011			2012			2013
Pre-tax income from continuing operations		3,555			3,150			2,827			1,058			1,675
Plus: (Income) or loss from equity investees		3			—			1			91			(10	)
Less: Capitalized interest		(49	)		(38	)		(49	)		(67	)		(54	)
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest		3,509			3,112			2,779			1,082			1,611
Fixed Charges:
Interest expensed and capitalized, amortization of debt discount and premium on all indebtedness		162			191			219			402			445
Interest component of rental expense (a)		212			222			220			291			248
Total fixed charges		374			413			439			693			693
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest plus fixed charges		3,883			3,525			3,218			1,775			2,304
Ratio of earnings to combined fixed charges		10.4			8.5			7.3			2.6			3.3

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