Commonwealth Fusion Systems develops commercial fusion-energy systems based on compact tokamaks and high-temperature superconducting magnets developed with MIT. Its SPARC demonstration machine is intended to achieve net fusion energy and validate technology for ARC, a planned grid-scale fusion power plant. On August 28, 2025, CFS announced an $863 million Series B2 round to complete SPARC and advance development of its first ARC plant in Virginia.
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