1. Biogas Products Ltd.
2. BioWorks Energy LLC
3. Clarke Energy by Kohler Co.
4. CNG Services Ltd.
5. EnviTec Biogas AG
6. ETW Energietechnik GmbH
7. Future Biogas Limited
8. Gazasia Ltd.
9. Hoffland Environmental Inc.
10. HZI Schmack GmbH by Hitachi Zosen Inova AG
11. J V Energen LLP
12. Nordsol
13. Orbital Gas Systems
14. Organics Group
15. PlanET Biogastechnik GmbH
16. Scotia Gas Networks Limited
17. Southern California Gas Company by Sempra Energy
18. VERBIO Vereinigte BioEnergie AG