Commonwealth Fusion Systems signed a letter of intent for a proposed federal semiconductor R&D award of up to $85 million. If the Commerce Department finalizes the CHIPS Act award, it would take a minority, non-controlling and non-voting stake in the fusion company—a government equity condition attached to work on the electronics needed to run its reactors.
Commerce announced the CFS agreement on October 22 as one of four letters covering awards of up to $389 million. The proposed CFS award would support semiconductors for radio-frequency plasma heating, power electronics, embedded diagnostic controls and radiation-hardened systems. The letter is not a final award or evidence that CFS has received the money.
CFS says its pulsed tokamak requires power supplies that can move up to 50 kiloamps into and out of superconducting magnets within seconds. It plans to develop silicon-carbide electronics for those loads, solid-state radio-frequency generators to heat fusion fuel, faster diagnostic controllers and radiation-hardened electronics for robotic maintenance.
The company is assembling SPARC, a high-field tokamak that uses high-temperature superconducting magnets to confine plasma. CFS expects it to reach Q>1 in 2027, meaning fusion reactions would produce more power than the external heating delivered to the plasma. That is not whole-plant electricity output: CFS assigns that job to SPARC’s planned successor, ARC, a 400-megawatt Virginia plant targeted for the early 2030s.
Google signed a June 2025 agreement to buy 200 megawatts from ARC, half its designed output. The agreement depends on SPARC reaching net fusion energy. Utility Dive reported in August that startup-built fusion machines had not recorded ignition and that none was operating commercially.
The proposed award is more targeted than CFS’s recent private financing. A $1 billion equity round announced in July took its disclosed capital raised since 2018 to $4 billion. CFS said that round would help complete SPARC and advance ARC, while the federal program is aimed at the semiconductor systems both machines would use.