Exhibit 12.2

Potomac Electric Power Company

	Three  Months Ended March 31, 2012			For the Year Ended December 31,
				2011		2010		2009		2008		2007
	(millions of dollars)
Net income	$	24		$	99	$	108	$	106	$	116	$	125
Income tax (benefit) expense		(5	)		36		37		76		64		62
Fixed charges:
Interest on long-term debt, amortization of discount, premium and expense		26			101		101		103		95		86
Other interest		2			10		10		11		11		12
Total fixed charges		28			111		111		114		106		98
Income before income tax expense and fixed charges	$	47		$	246	$	256	$	296	$	286	$	285
Ratio of earnings to fixed charges		1.68			2.22		2.31		2.60		2.70		2.91
Total fixed charges, shown above		28			111		111		114		106		98
Preferred dividend requirements, adjusted to a pre-tax amount		—			—		—		—		—		—
Total fixed charges and preferred dividends	$	28		$	111	$	111	$	114	$	106	$	98
Ratio of earnings to fixed charges and preferred dividends		1.68			2.22		2.31		2.60		2.70		2.91