1. ABB Ltd.
2. Ansaldo Energia S.p.A.
3. Bharat Heavy Electricals Limited
4. Capstone Green Energy Corporation
5. Centrax Ltd.
6. Danfoss A/S
7. Doosan Enerbility Co. Ltd.
8. General Electric Company
9. GKN PLC
10. Harbin Electric Corporation
11. Hindustan Aeronautics Limited
12. Honeywell International Inc.
13. IHI Corporation
14. Kawasaki Heavy Industries
Ltd.
15. MAN Energy Solutions
16. MAPNA Group
17. Mitsubishi Heavy Industries
Ltd.
18. MTU Aero Engines AG
19. Nidec Corporation
20. OPRA Turbines BV
21. Power Machines
22. Regal Rexnord Corporation
23. Rolls-Royce PLC
24. Siemens AG
25. Solar Turbines Incorporated
26. TECO-Westinghouse
27. Toshiba Corporation
28. Vericor Power Systems
29. WEG S.A.
30. W?rtsil? Corporation