Commonwealth Fusion Systems
Compact tokamak fusion power
Ranked #2 in Best Deep Tech Startups to Watch.
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 2nd of 10 in Best Deep Tech Startups to Watch (Lister Score 95.6).
#2 in Best Deep Tech Startups to Watch · Lister Score 95.6
Google and Eni were the only investors named in the July 2026 round, and CFS says it expects SPARC to show net energy gain in 2027..
| Rank | Best Deep Tech Startups to Watch | Score |
|---|---|---|
| 1 | Anduril Industries | 96.8 |
| 2 | Commonwealth Fusion Systems | 95.6 |
| 3 | Helsing | 94.5 |
| 4 | PsiQuantum | 93.3 |
| 5 | Shield AI | 92.0 |
| 6 | Figure AI | 90.8 |
| 7 | Saronic Technologies | 89.5 |
| 8 | Hadrian | 88.2 |
| 9 | Stoke Space | 86.9 |
| 10 | Varda Space Industries | 85.6 |
Frequently asked questions
How does Commonwealth Fusion Systems rank on Lister?
Commonwealth Fusion Systems is ranked 2nd of 10 in Best Deep Tech Startups to Watch (Lister Score 95.6).
Appears in
- #1 in Best Fusion Energy Companies · Deep Tech
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