Exhibit 12.2

Potomac Electric Power Company

	Nine Months Ended September 30, 2010		For the Year Ended December 31,
			2009		2008		2007		2006		2005
	(millions of dollars)
Net income	$	77	$	106	$	116	$	125	$	85	$	165
Income tax expense (a)		62		76		64		62		58		128
Fixed charges:
Interest on long-term debt, amortization of discount, premium and expense		76		103		95		86		77		83
Other interest		8		11		11		12		13		14
Total fixed charges		84		114		106		98		90		97
Income before income tax expense, and fixed charges	$	223	$	296	$	286	$	285	$	233	$	390
Ratio of earnings to fixed charges		2.65		2.60		2.70		2.91		2.59		4.04
Total fixed charges, shown above		84		114		106		98		90		97
Preferred dividend requirements, adjusted to a pre-tax amount		—		—		—		—		2		2
Total fixed charges and preferred dividends	$	84	$	114	$	106	$	98	$	92	$	99
Ratio of earnings to fixed charges and preferred dividends		2.65		2.60		2.70		2.91		2.54		3.94

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