Commonwealth Fusion Systems books a $1B+ power deal for its future fusion reactor

Commonwealth Fusion Systems (CFS) has secured a power purchase agreement worth over $1 billion with Italian energy company Eni for electricity generated by its first commercial fusion reactor, Arc, expected to come online in the early 2030s. The 400-megawatt Arc reactor will be located near major U.S. data centers, and this deal follows a similar agreement with Google announced earlier. While specific details about the power volume and timeline remain undisclosed, CFS CEO Bob Mumgaard confirmed that the demonstration-scale Sparc reactor, designed to validate the technology, is 65% complete and on track for activation in late 2026. CFS’s fusion technology is based on a tokamak design using superconducting magnets to confine plasma and generate energy through fusion reactions. Sparc aims to demonstrate net-positive power output, a critical milestone before scaling to the larger Arc plant. The company has raised nearly $3 billion from investors including Nvidia, Google, Breakthrough Energy Ventures, and