Commonwealth Fusion Systems, spun out of MIT in 2018 and based in Devens, Massachusetts, is building SPARC, a compact tokamak that uses high-temperature superconducting magnets, and plans its first ARC power plant in Virginia. In July 2026 it raised $1 billion, taking its total funding to about $4 billion.
At a glance
| Price from | Custom |
| Best for | Utilities and data centre operators planning firm clean power |
From Commonwealth Fusion Systems's own website.
What stands out
- Large funding base for a fusion company
- Backed by Google and Eni
Worth knowing
- No net energy result yet
- Commercial power still years away
How it ranks
Commonwealth Fusion Systems is ranked 1st of 10 in Best Fusion Energy Companies (Lister Score 97.0).
#1 in Best Fusion Energy Companies · Lister Score 97.0
Commonwealth Fusion Systems, spun out of MIT and based in Devens, Massachusetts, is building SPARC, a compact tokamak designed to show net fusion energy, and plans its first ARC power plant in Chesterfield County, Virginia. It said in August 2025 it had raised close to $3 billion.
Google agreed in June 2025 to buy 200 MW of power from CFS's first ARC plant..
| Rank | Best Fusion Energy Companies | Score |
|---|---|---|
| 1 | Commonwealth Fusion Systems | 97.0 |
| 2 | Helion Energy | 95.8 |
| 3 | TAE Technologies | 94.5 |
| 4 | Pacific Fusion | 93.2 |
| 5 | Proxima Fusion | 92.0 |
| 6 | Type One Energy | 90.7 |
| 7 | Tokamak Energy | 89.4 |
| 8 | General Fusion | 88.1 |
| 9 | Zap Energy | 86.8 |
| 10 | Thea Energy | 85.4 |
Frequently asked questions
How does Commonwealth Fusion Systems rank on Lister?
Commonwealth Fusion Systems is ranked 1st of 10 in Best Fusion Energy Companies (Lister Score 97.0).
Appears in
- #2 in Best Deep Tech Startups to Watch · Startups
Add this badge to your site
If you work at Commonwealth Fusion Systems, paste this code into your website to show where it ranks on Lister. The badge links to the ranking and updates within a day when the rank changes.