Commonwealth Fusion Systems (CFS) is the world’s leading and largest private fusion company. The company’s marquee fusion project, SPARC, will generate net energy, paving the way for limitless carbon-free energy. The company has raised $3 billion in capital since it was founded in 2018.
CFS develops high-temperature superconducting magnets to enable compact tokamak fusion power plants. The company manufactures these magnets at its Devens, Massachusetts facility where it is also building SPARC, a tokamak demonstration machine fueled by deuterium-tritium plasma to achieve net energy gain with Q>1, with operations targeted for 2027. It also is developing and plan to construct it's first ARC power plant, called the Fall Line Fusion Power Station, a grid-scale fusion power plant producing 400 MWe set to come online in Virginia in the early 2030s. Google has committed to purchasing 200 MW of electricity from ARC, with Eni, the large Italian oil and gas company also agreeing to offtake additional power in a deal worth over $1B. CFS also has a joint development agreement (JDA) and strategic partnership with Dominion Energy, who is assisting in the development of the power plant. CFS raised $863 million in its Series B2 funding round in August 2025, following a $1.8 billion Series B in 2021 with participation from Temasek, Google, Breakthrough Energy Ventures, and Eni, for a total close to $3 billion to date. Bob Mumgaard serves as CEO and co-founder, while Brandon Sorbom is Chief Science Officer and co-founder, both with PhDs in plasma physics from MIT.
