1. AB Volvo Penta
2. ABB Ltd.
3. Aksa Jenerat?r Sanayi A.?.
4. Alconza Berango S.L.
5. Atlas Copco AB
6. Ausonia S.r.l.
7. Caterpillar Inc.
8. Chroma Power Systems India Private Limited
9. Cooper Corporation Pvt Ltd.
10. Cummins Inc.
11. Fischer Panda GmbH
12. Generac Holdings Inc.
13. General Electric Company
14. Himoinsa S.L.
15. Honda India Power Products Ltd.
16. Innovus Power Inc.
17. Kirloskar Oil Engines Ltd.
18. Kohler Co.
19. Mitsubishi Electric Power Products Inc.
20. Perkins Engines Company Limited
21. Rolls-Royce Holdings PLC
22. Siemens AG
23. Wartsila Corporation
24. WhisperPower B.V.
25. YANMAR Co. Ltd.