Shares of the energy wholesale NRG Energy Inc (NYSE:NRG) were upgraded from neutral to conviction buy by Goldman. According to Goldman, NRG Energy has extensive free cash flows, which the company can use for acquisitions, stock buyback, or retire debt. The upgrade today should definitely give a boost to NRG Energy slumping shares. The price target was increased to $35 a share from the prior target of $30 a share.