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6h ago

Commonwealth Fusion Systems Raises $863 Million To Accelerate SPARC Fusion Demo

The round funds a push to finish the Devens prototype to attempt net‑energy operation.

Commonwealth Fusion Systems has announced new funding.

Overview

  • CFS closed a $863 million Series B2 round backed by Google, Nvidia and Breakthrough Energy Ventures.
  • The new capital is directed to the SPARC tokamak in Devens, which the company says is about 65% complete.
  • CEO Bob Mumgaard says SPARC could be turned on within one to two years, with reporting citing a target of 2026 activation and a 2027 scientific breakeven goal.
  • The company continues to plan its ARC commercial plant in Virginia at roughly 400 megawatts, with deployment targeted for the mid‑2030s.
  • CFS says building ARC will require several billion dollars more with financing still to be determined, and reporting indicates Google has committed to buy 200 megawatts from the future plant.