Commonwealth Fusion Systems
| Company type | Private |
|---|---|
| Industry | Energy |
| Founded | 2018 |
| Headquarters | Devens, Massachusetts , US |
Key people | Bob Mumgaard (CEO) |
Number of employees | 1,000+ (2025) |
| Website | cfs |
Commonwealth Fusion Systems (CFS) is an American fusion power company founded in 2018 in Cambridge, Massachusetts, after a spin-out from the Massachusetts Institute of Technology (MIT). Its stated goal is to build a small fusion power plant based on the ARC tokamak design. It has participated in the United States Department of Energy’s INFUSE public-private knowledge innovation scheme, with several national labs and universities.