Calpine (CPN +2.1%) gets a boost from an upgrade to Buy on valuation from Jefferies on the back...

|About: Calpine Corporation (CPN)|By:, SA News Editor

Calpine (CPN +2.1%) gets a boost from an upgrade to Buy on valuation from Jefferies on the back of last weeks encouraging Q1 report and increased guidance. The firm also raises its price target to $21.50 from $18.