Exhibit 12.2

Potomac Electric Power Company

			For the Year Ended December 31,
	Nine Months Ended September 30, 2011		2010		2009		2008		2007		2006
	(millions of dollars)
Net income	$	88	$	108	$	106	$	116	$	125	$	85
Income tax expense (a)		32		37		76		64		62		58
Fixed charges:
Interest on long-term debt, amortization of discount, premium and expense		76		101		103		95		86		77
Other interest		8		10		11		11		12		13
Total fixed charges		84		111		114		106		98		90
Income before income tax expense, and fixed charges	$	204	$	256	$	296	$	286	$	285	$	233
Ratio of earnings to fixed charges		2.43		2.31		2.60		2.70		2.91		2.59
Total fixed charges, shown above		84		111		114		106		98		90
Preferred dividend requirements, adjusted to a pre-tax amount		—		—		—		—		—		2
Total fixed charges and preferred dividends	$	84	$	111	$	114	$	106	$	98	$	92
Ratio of earnings to fixed charges and preferred dividends		2.43		2.31		2.60		2.70		2.91		2.54

(a) Concurrent with the adoption of FASB guidance on taxes (ASC 740) in 2007, amount includes interest on uncertain tax positions.