AIM-listed power company Plutus PowerGen has been granted planning permission for the development of two renewable energy generation sites in Stowmarket, Suffolk.The company said preparations for the civil construction phase of both projects can now commence. The approvals bring the total number of 20MW sites which have planning permission to seven.PPG is also progressing planning applications for three additional sites capable of producing 60MW and applications for two additional sites are currently being prepared for submission.