Commonwealth Fusion adds $1 billion, mostly from institutional money

The fusion startup's latest round takes it to $4 billion raised, and for the first time institutions rather than VCs supplied the majority.

Commonwealth Fusion Systems announced another $1 billion raise, bringing its total since spinning out of MIT in 2018 to $4 billion. By Heatmap's accounting the company now holds about 30% of all private capital that has gone into fusion. The composition matters as much as the size: this round came largely from institutional investors — pension funds, sovereign wealth funds — rather than venture capital, and CFS's newly named chief financial officer, Lorence Kim, said it was the first time institutions made up the majority of a round. The company declined to break down new versus returning investors.

Kim is a former Goldman Sachs banker who helped take Moderna public and held the top financial job there through the start of the pandemic. He was careful to say this is not the kind of capital raised ahead of a stock listing, but the hire itself says something about where the company thinks it is heading.

The machine behind the money is SPARC, the prototype tokamak being assembled in central Massachusetts, which CFS expects will next year become the first private reactor — and the first tokamak of any kind — to release more energy than it took to start the fusion reaction. Magnets for the doughnut-shaped reactor are being built on the same site.

If that works, it is the purest version of what this project tracks: baseload power with no fuel scarcity behind it. But nothing is demonstrated yet. Net energy gain is a claim about next year, not a result, and commercial electricity is further out still. The date to watch is SPARC's.

Source: Heatmap