1. Johnson Controls
2. Aecom
3. Daikin Industries
4. Trane
5. Ameresco
6. Eaton
7. Orion Energy Systems
8. Schneider Electric
9. General Electric
10. Philips Lighting
11. Engie
12. Siemens
13. The Brewer-Garrett Company
14. Digi-Key Electronics
15. Renesas Electronics Corporation