Exhibit 12.2

Potomac Electric Power Company

			For the Year Ended December 31,
	Nine Months Ended September 30, 2012		2011		2010		2009		2008		2007
	(millions of dollars)
Net income	$	101	$	99	$	108	$	106	$	116	$	125
Income tax expense		38		36		37		76		64		62
Fixed charges:
Interest on long-term debt, amortization of discount, premium and expense		79		101		101		103		95		86
Other interest		7		10		10		11		11		12
Total fixed charges		86		111		111		114		106		98
Income before income tax expense and fixed charges	$	225	$	246	$	256	$	296	$	286	$	285
Ratio of earnings to fixed charges		2.62		2.22		2.31		2.60		2.70		2.91
Total fixed charges, shown above	$	86	$	111	$	111	$	114	$	106	$	98
Preferred dividend requirements, adjusted to a pre-tax amount		—		—		—		—		—		—
Total fixed charges and preferred dividends	$	86	$	111	$	111	$	114	$	106	$	98
Ratio of earnings to fixed charges and preferred dividends		2.62		2.22		2.31		2.60		2.70		2.91