1. ABB Ltd.
2. AEMC
3. Ballard Power Systems Inc.
4. Capstone Green Energy Corporation
5. Caterpillar Inc.
6. Cummins Inc.
7. Doosan Enerbility Co. Ltd.
8. General Electric Company
9. Huawei Technologies Co. Ltd
10. Mitsubishi Heavy Industries
Ltd.
11. Rolls-Royce PLC
12. Schneider Electric SE
13. Sharp Corporation
14. Siemens AG
15. Toyota Turbine and Systems Inc. by Toyota