1. 2G Energy AG
2. Axiom Energy Group
LLC
3. BDR Thermea Group
4. Centrica PLC
5. Ceres Power Holdings PLC
6. EC POWER A/S
7. EDF Group
8. Honda Motor Co. Ltd.
9. Micro Turbine Technology B.V.
10. Siemens AG
11. TEDOM a.s.
12. Vaillant GmbH
13. Veolia
14. Viessmann Climate Solutions SE
15. Yanmar Holdings Co. Ltd.