1. 2G Energy AG
2. AB Holdings SPA
3. Agrinz Technologies GmbH
4. Air Liquide S.A.
5. AirScience Technologies Inc.
6. Ameresco Inc.
7. Archea New Energy GmbH
8. Atmos Power Pvt. Ltd.
9. BD Sensors GmbH
10. Bio energy (Shanghai) Co. Ltd.
11. Bosch Thermotechnik GmbH
12. Bright Renewables B.V.
13. CarboTech AC GmbH
14. Cryonorm BV
15. DMT Environmental Technology
16. DVO Inc.
17. Ennox Biogas Technology GmbH
18. EnviTec Biogas AG
19. Exxon Mobil Corporation
20. Future Biogas Limited
21. Gasmet Technologies Oy
22. Gasrec Ltd.
23. Gasum Group
24. GTS Snc
25. Hitachi Zosen Inova AG
26. IES BIOGAS srl by Snam SPA
27. Konrad Pumpe GmbH
28. Malmberg Borrning AB
29. NeoZeo AB
30. Nijhuis Saur Industries
31. Pentair PLC
32. Perennial Energy
LLC
33. PlanET Biogastechnik GmbH
34. QED Environmental Systems Ltd. by Graco
35. Renergon International AG
36. Suomen Biovoima Oy
37. Weltec Biopower GmbH
38. W?rtsil? Corporation
39. Xebec Adsorption Inc. by Ivys Adsorption Inc.