Commonwealth Fusion Systems

CFS says its SPARC facility is about 75% complete, with both halves of the vacuum vessel and two of the 18 toroidal field magnets now in Tokamak Hall.

At CES 2026 in January, CFS installs the first of SPARC's 18 toroidal field magnets — each about 24 tons, generating roughly 20 tesla — and announces a partnership with Nvidia and Siemens to build an AI-powered digital twin of SPARC using Siemens Xcelerator and Nvidia Omniverse. All 18 magnets are targeted to be installed by the end of summer 2026.

In April 2026 CFS signs a long-term strategic partnership to design and manufacture HTS magnets for Realta Fusion's CoSMo magnetic-mirror fusion systems. CFS' chief commercial officer Rick Needham calls it the company's largest deal of its kind to date, with potential multi-billion-dollar value over the life of the agreement.

On April 28, 2026, CFS becomes the first fusion company to submit a grid interconnection request, applying to PJM Interconnection for its first commercial ARC plant — officially named the Fall Line Fusion Power Station — on a 100-acre site in the James River Industrial Center in Chesterfield County, Virginia. CFS still targets electricity delivery from ARC in the early 2030s.

In May 2026 CFS lowers the second 48-ton half of the SPARC vacuum vessel into Tokamak Hall, giving the tokamak its final structural shape. Closure of the external cryostat and integration of fuel lines remain pending as the team continues toward end-of-summer magnet completion.

On June 4, 2026 CFS publishes a five-paper ARC Physics Basis in a special issue of Cambridge University Press' Journal of Plasma Physics, the most detailed peer-reviewed scientific case yet for a commercial-scale tokamak power plant. The papers use SPARC design lessons and state-of-the-art tools to project that the Fall Line Fusion Power Station will produce roughly 1.1 GW of fusion power and deliver about 400 MW of continuous net electricity to the grid, building on the original seven SPARC papers from 2020.

On July 1, 2026 CFS became the first international company to join the UK Atomic Energy Authority's Lithium Breeding Tritium Innovation (LIBRTI) program, a £220 million UK government initiative to demonstrate net tritium production for fusion power. The partnership gives CFS early access to world-leading breeding-blanket testing infrastructure — including a large high-flux neutron source at UKAEA's Culham Campus in Oxfordshire — to develop and test the systems a commercial reactor would need to generate its own tritium fuel, one of fusion's biggest unsolved challenges.

Google signs a strategic partnership that includes a 200 MW power purchase agreement from ARC and collaboration on grid decarbonization and commercial fusion deployment.

Raises $863M to complete SPARC and continue development work on ARC in Virginia, bringing total capital raised to nearly $3B.

Delivers superconducting magnets to the University of Wisconsin's WHAM project, marking the first products shipped as part of CFS' strategy to serve applications beyond its own power plants.

Announces ARC commercial fusion plant will be built at James River Industrial Center in Chesterfield County, Virginia, on land leased from Dominion Energy.

Successfully tests the most powerful high-temperature superconducting magnet ever built, a critical milestone for SPARC's compact tokamak design.

Raises $1.8B in the largest private fusion funding round to date. Begins construction on SPARC at Devens, Massachusetts.

Closes $115M Series A from Eni, Breakthrough Energy Ventures, and Khosla Ventures to advance HTS magnet development.

CFS spins out of MIT's Plasma Science and Fusion Center with $50M in initial funding from Eni.