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 has raised $4 billion, more than any other private fusion company, while advancing both SPARC and its first commercial plant in parallel. SPARC was reported nearly 80% complete in August 2026, and ARC has entered the PJM interconnection process with Google and Eni contracted for more than half of the first plant's planned output.
How it runs
CFS follows a staged build-own-and-commercialize roadmap: manufacture high-temperature-superconducting magnets and operate SPARC as the net-energy demonstration, then develop ARC grid-scale plants and replicate them with an industrial supply chain.
How it earns
Commercial revenue is expected from long-term electricity offtake agreements from ARC plants. Google contracted for 200 MW from the first 400 MW ARC plant and holds options for future plants; Eni signed an offtake agreement valued at more than $1 billion. Detailed pricing terms remain undisclosed.
Why it wins
CFS combines the well-studied tokamak approach with 20-tesla-class high-temperature-superconducting magnets developed with MIT, enabling smaller, higher-field machines that it says can be built at lower cost; its SPARC-to-ARC sequence is designed to retire technical risk before commercial replication.
Evidence ledger
- website · 2026-04-27
Commonwealth Fusion Systems identifies as a reindustrialization company.
https://cfs.energy - organization-dossier-research · 2026-09-14
Dossier fields supported: operatingModel
https://blog.cfs.energy/whats-new-at-cfs-sparc-assembly-and-commissioning-work-begins/ - organization-dossier-research · 2026-09-14
Dossier fields supported: revenueModel
https://www.cfs.energy/news-and-media/google-and-commonwealth-fusion-systems-sign-strategic-partnership/ - organization-dossier-research · 2026-09-14
Dossier fields supported: revenueModel
https://www.cfs.energy/news-and-media/eni-and-commonwealth-fusion-systems-sign-1-billion/ - organization-dossier-research · 2026-09-14
Dossier fields supported: strategicEdge
https://www.cfs.energy/technology/hts-magnets/ - first-party · 2026-09-23
CFS raised an additional $1 billion, bringing total capital raised to $4 billion, and is advancing SPARC and ARC in parallel.
https://www.cfs.energy/news-and-media/commonwealth-fusion-systems-raises-another-1-billion-bringing-total-capital-raised-to-4-billion/ - first-party · 2026-09-23
CFS reported SPARC nearly 80% complete, with magnets being installed and support systems operating, and said ARC cleared two DOE milestones.
https://blog.cfs.energy/sparc-progress-doe-milestone-approvals-reflect-cfs-power-plant-maturity/ - first-party · 2026-09-23
CFS submitted a PJM interconnection request for its 400 MW Virginia ARC plant and identified Google and Eni as contracted offtakers.
https://www.cfs.energy/news-and-media/commonwealth-fusion-systems-becomes-first-fusion-company-to-apply-to-pjm-interconnection-the-largest-u.s.-wholesale-electricity-market - first-party · 2026-09-23
Hyundai invested in CFS and is exploring collaboration on future ARC power plants and fusion deployment in Korea.
https://www.cfs.energy/news-and-media/commonwealth-fusion-systems-announces-equity-investment-by-hyundai-motor-group/
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