Exhibit 12.2

Exelon Generation Company, LLC

Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2008			2009			2010			2011			2012
Pre-tax income from continuing operations		3,388			3,555			3,150			2,827			1,058
Plus: Loss from equity investees		1			3			—			1			91
Less: Capitalized interest		(33	)		(49	)		(38	)		(49	)		(67	)
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest		3,356			3,509			3,112			2,779			1,082
Fixed Charges:
Interest expensed and capitalized, amortization of debt discount and premium on all indebtedness		170			162			191			219			402
Interest component of rental expense (a)		272			212			222			220			291
Total fixed charges		442			374			413			439			693
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest plus fixed charges		3,798			3,883			3,525			3,218			1,775
Ratio of earnings to fixed charges		8.6			10.4			8.5			7.3			2.6

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