Commonwealth Fusion Systems
High-field tokamak fusion, building SPARC and the world's first fusion power plant
The product
High-temperature superconducting (HTS) magnet-based tokamaks. SPARC, under construction at the Devens, MA campus, is designed to be the first machine to demonstrate net-energy fusion (Q>1). ARC, sited in Chesterfield County, Virginia, is the planned 400 MW first-of-a-kind commercial fusion power plant.
The thesis
CFS is the MIT spinout that did the magnet thing the rest of fusion said couldn't be done at scale, and is the only company with a binding power plant site (Virginia) and an at-scale construction campus (Devens). Their Series B2 of $863M (Aug 2025) brings total raised to nearly $3B — the biggest balance sheet in fusion. If SPARC hits Q>1, the path to commercial fusion shortens by a decade.
Evidence ledger
- website · 2026-04-27
Commonwealth Fusion Systems identifies as a reindustrialization company.
https://cfs.energy
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