1. Kirloskar Electric Company 2. Sutton Power Engineering 3. Atlas Copco AB 4. Mitsubishi Heavy Industries Ltd 5. Rolls-Royce plc 6. General Electric 7. Denyo Co. Ltd 8. JS Power 9. Generac Power Systems Inc. 10. Kohler Co. 11. Ashok Leyland 12. Cummins Inc. 13. Caterpillar 14. Wartsila 15. Yanmar Co Ltd