Commonwealth Fusion Systems Raises $863 Million to Propel Fusion Energy Forward
Massachusetts-based fusion startup Commonwealth Fusion Systems (CFS) has successfully raised $863 million in its latest funding round, attracting a wide range of investors, including Google, Nvidia, and Breakthrough Energy Ventures.
“This round of capital isn’t just about fusion as a concept,” said co-founder and CEO Bob Mumgaard. “It’s about how we turn fusion into a commercial industrial endeavor.” CFS has now raised nearly $3 billion, making it the most-funded fusion startup in the world.
The company is currently building its Sparc prototype reactor in a Boston suburb, scheduled to begin operation next year. Sparc aims to reach scientific breakeven in 2027, a milestone where the fusion reaction produces more energy than required to ignite it. Although Sparc won’t sell power to the grid, it will validate CFS’s technology and cost models.
Looking forward, assuming Sparc performs as expected, CFS plans to start construction on Arc, its commercial-scale power plant in Virginia, in 2027 or 2028. Investors hope that such a broad funding base will help the startup build supply chains, partnerships, and a path toward industrial fusion.
