Commonwealth Fusion Systems has raised $4 billion total, capturing 30% of all private fusion investment, with its SPARC reactor 80% complete and

CEO Bob Mumgaard said the reactor, SPARC, is now “about 80% complete.” Experts remain divided over how soon they believe fusion technology could be commercialized.

Commonwealth Fusion Systems has raised $4 billion total, capturing 30% of all private fusion investment, with its SPARC reactor 80% complete and