1. Allied Power Group
2. American Air Filter Company Inc.
3. Ansaldo Energia S.p.A.
4. Capstone Green Energy Corporation
5. Chromalloy Gas Turbine LLC
6. Doosan Enerbility Co. Ltd.
7. EthosEnergy Group
8. General Electric Company
9. GKN Ltd.
10. Goltens Worldwide Management Corporation
11. HPI LLC
12. Kawasaki Heavy Industries
Ltd.
13. Liburdi Engineering Limited
14. MAN Energy Solutions SE
15. Mechanical Dynamics & Analysis LLC
16. Mitsubishi Heavy Industries
17. MJB International Limited LLC
18. MOR PPM Inc. by EMCOR Group Inc.
19. MTU Aero Engines AG
20. Power Services Group
21. Power Systems Mfg. LLC
22. S&S Turbine Services Ltd.
23. Siemens AG
24. Skyline Turbine Services B.V.
25. Solar Turbines Incorporated by Caterpillar Inc.
26. Sulzer Ltd.
27. TRS Services
LLC