Exhibit 12.7

Potomac Electric Power Company

Ratio of Earnings to Fixed Charges

	Years Ended December 31,
	2012			2013			2014			2015			2016
Pre-tax income from continuing operations		193			235			264			289			83
Less: Capitalized interest		(2	)		(1	)		(2	)		(1	)		(10	)
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest		191			234			262			288			73
Fixed Charges:
Interest expensed and capitalized, amortization of debt discount and premium on all indebtedness		106			114			121			130			137
Interest component of rental expense (a)		7			7			7			7			3
Total fixed charges		113			121			128			137			140
Pre-tax income from continuing operations after adjustment for income or loss from equity investees and capitalized interest plus fixed charges		304			355			390			425			213
Ratio of earnings to fixed charges		2.7			2.9			3.0			3.1			1.5

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