SAN FRANCISCO (Standard&Poor's) Sept. 30, 2011--Standard&Poor's Ratings Services today raised Calpine Corp.'s (Calpine) corporate credit rating to 'B+' from 'B'. We also raised the rating on secured debt at Calpine Corp. to 'BB-' from 'B+'. The '2' recovery rating on the secured debt is affirmed, indicating expectations for substantial recovery of principal (70% to 90%) in the event of a payment default. The outlook is stable. We also revised the company's business profile to "fair" from "weak", while the financial profile remains "highly leveraged". The rating upgrade reflects several factors that benefit both the business and financial profiles of the company. These include the acquisition of the Connectiv assets in June 2010, which added capacity revenues