Conventional floating drum biogas plants use fabricated Mild steel tanks as gasholders. These heavy steel gasholders provide adequate pressure at burners but steel is costly and corrodes. Plastic gasholders resist corrosion but lack weight. PRINCE plastic gasholders possess pockets on hood and side walls where concrete blocks are added to boost biogas pressure. Stackable design of digesters and gasholder improves transportability. For cattle-dung concrete digesters are recommended while for food waste digesters are in plastic. Gasholders are in plastic. PRINCE designs provides technological breakthrough for CDM projects where thousands of biogas plants are to be installed in short time.