Commonwealth Fusion Systems

@cfs.energy

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We’re on a mission to deliver clean fusion energy to the planet fast enough to matter for humanity’s biggest challenges.⚡️🔆💫

Alex Creely, CFS Chief Engineer for ARC
The WHAM project at UW Madison with magnets supplied by CFS
Both halves of the SPARC vacuum vessel
The second half of the vacuum vessel of CFS' SPARC tokamak
Bob Mumgaard speaking at CERAWeek 2026
Two of SPARC's toroidal field magnets mounted inside Commonwealth Fusion Systems' Tokamak Hall.
Rick Needham
Joe Paluska
Bob Mumgaard
Bob Mumgaard
A screenshot of a newspaper headline: "Commercial fusion ow within reach"
CFS' SPARC digital twin
An illustration of Commonwealth Fusion Systems' planned ARC fusion power plant, a boxy building behind a field of green grass.
A New York Times story with illustrations of Commonwealth Fusion System's SPARC machine and a Hefei Institutes of Physical Science facility. The headline and subhead are: Clean, Limitless Energy Exists. China Is Going Big in the Race to Harness It. Beijing is pouring vast resources into fusion research, while the U.S. wants private industry to lead the way. The winner could reshape civilization.
Photo of welder inside large structure being built as part of China's fusion energy efforts.
A D-shaped toroidal field (TF) magnet, welded into its stainless steel case and surrounded by the team who helped manufacture it, rests in a testing chamber at the Commonwealth Fusion Systems magnet factory.
Half of SPARC's vacuum vessel inside CFS' Tokamak Hall.
An aerial view of Commonwealth Fusion Systems' SPARC facility, a cross-shaped building that houses a fusion energy machine called a tokamak the company is building at its headquarters in Devens, Massachusetts. Behind the building is a green forest.
Commonwealth Fusion Systems CEO and Co-founder Bob Mumgaard speaks about the intersection of fusion energy and AI on a stage. To the left of him in the photo are Tom Gibbs, who leads NVIDIA's Global Market for Physics and Material Science Applications, and Martijn Rasser, Senior Director for Economy for the Special Competitive Studies Project, which organized the conference.
CFS CEO and Co-founder Bob Mumgaard, viewed in profile and wearing a suit jacket, gestures with both arms as he speaks at an event to discuss fusion and AI.