NEW YORK (Standard&Poor's) Oct. 27, 2008--Standard&Poor's Ratings Services today placed its ratings on seven Exelon Generation Co. LLC jointly supported letter of credit (LOC) bond issues on CreditWatch with negative implications. At the same time, Standard&Poor's affirmed its ratings on seven jointly supported LOC bond issues (see list). These rating actions follow our Oct. 21, 2008, placement of our long-term counterparty credit ratings on Exelon Generation Co. LLC on CreditWatch negative (see "Exelon's Rating Cut, On Watch Neg And NRG Energy's Rating On Watch Pos Re: Proposed Offer" on RatingsDirect, the real-time Web-based source for Standard&Poor's credit ratings, research, and risk analysis, at www.ratingsdirect.com). The ratings on the seven bond issues are