“SPARC is now 'about 80% complete,' and the company expects to show net energy gain in 2027.”
Said Aug 24, 2026Deadline Dec 31, 2027Utility Dive, 'Commonwealth Fusion Systems aims to complete demonstration reactor with $1B funding round', August 24, 2026
CFS has raised roughly $4 billion to date; Mumgaard told Canary Media in July 2026 that SPARC should come together in early-to-mid 2027, at which point he expects to demonstrate net energy gain.