NEW YORK (Standard&Poor's) April 19, 2012--Standard&Poor's Ratings Services today raised its rating on Maryland Economic Development Corp.'s $75 million adjustable mode revenue refunding bonds series 2006A (for the Constellation Energy Group Inc. project) due April 1, 2024, to 'AA+/A-1+' from 'AA/A-1+'. At the same time, we removed the rating from CreditWatch with positive implications, where we had placed it on May 6, 2011. The long- and short-term components of our rating on the series 2006A bonds are based on our long- and short-term issuer credit ratings on, as well as the joint support provided by, The Royal Bank of Scotland PLC ('A/A-1'), the letter of credit (LOC) provider, and Exelon Corp. ('BBB/A-2'), the obligor, assuming a
