Exhibit 12.5

Commonwealth Edison Company

Ratio of Earnings to Fixed Charges

	2007			2008		2009			2010			2011			For the three months ended March 31, 2012
Pre-tax income from continuing operations		245			329		602			693			666			148
Plus: Loss from equity investees		7			9		—			—			—			—
Less: Capitalized interest		(13	)		3		(3	)		(2	)		(4	)		(1	)
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest		239			341		599			691			662			147
Fixed charges:
Interest expensed and capitalized, amortization of debt discount and premium on all indebtedness (a)		308			323		301			368			330			78
Interest component of rental expense (b)		8			8		7			6			6			2
Total fixed charges		316			331		308			374			336			80
Pre-tax income from continuing operations after adjustment for loss from equity investees plus fixed charges		555			672		907			1,065			998			227
Ratio of earnings to fixed charges		1.8			2.0		2.9			2.8			3.0			2.8

(a) Includes interest expense of $0 for the quarter ended March 31, 2012, and $0, $63 million, $0, $0 and $0 for the years ended December 31, 2011, 2010, 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.