Commonwealth Fusion Systems Attracts $863 Million from Tech and Energy Giants

Massachusetts fusion startup CFS announced it has raised $863 million from a wide spectrum of investors, including Google, Nvidia, and Breakthrough Energy Ventures. The funding demonstrates growing confidence in fusion as a viable energy source.

CEO Bob Mumgaard explained, “Our goal is to move fusion beyond theory and into a commercial industrial reality.” With total funding now approaching $3 billion, CFS is the best-funded fusion startup globally.

The company is building the Sparc reactor, a tokamak prototype designed to test fusion at a commercial scale. Sparc is scheduled to operate next year and aims for scientific breakeven in 2027—the point at which the reactor produces more energy than required to start the reaction.

Following Sparc, CFS plans to construct Arc, its first commercial fusion plant, in Virginia. Broad investor participation is expected to aid in establishing supply chains and partnerships critical for constructing and operating fusion power facilities.