1. AE&E Nanjing Boiler Co. Ltd.
2. Alstom SA
3. Andritz AG
4. Babcock & Wilcox Enterprises Inc.
5. Bharat Heavy Electricals Limited
6. Doosan Heavy Industries and Construction Co. Ltd.
7. EBARA Environmental Plant Co. Ltd.
8. Formosa Heavy Industries Corp.
9. General Electric Company
10. Harbin Boiler Engineering Co. Ltd.
11. Hyundai Heavy Industries Co. Ltd.
12. Industrial Boilers America
13. JFE Engineering Corporation
14. John Wood Group PLC
15. KEPCO Engineering & Construction Company Inc.
16. Metso Oyj
17. Mitsubishi Heavy Industries
Ltd.
18. PlusFurnace
19. Rakhoh Industries Pvt Ltd.
20. Shanghai Electric Group Co. Ltd.
21. Sumitomo Heavy Industries Limited
22. Thermax. Ltd.
23. Thermodyne Boilers
24. Typeosa Heavy Industries Corp
25. Valmet Oyj
26. Zhengzhou boiler Co. Ltd.