SAN FRANCISCO (Standard&Poor's) Nov. 24, 2010--Standard&Poor's Ratings Services said today that the corporate credit rating and all issue debt ratings on NRG Energy Inc. (NRG; BB-/Stable/B-2) are unaffected following Dynegy Inc. (B-/Watch Neg/B-2) shareholders' rejection of The Blackstone Group's offer to buy all of Dynegy for $5 per share, up from $4.50 per share announced on Aug. 13, 2010. On Aug. 17, 2010, we affirmed the 'BB-' corporate credit rating and all issue ratings on NRG and assigned our 'BB-' rating to the company's proposed $750 million senior bond issue to finance the acquisition of 3.8 gigawatts of gas-fired assets from Dynegy, which were being sold in connection with the Blackstone offer. That transaction is now