Commonwealth Fusion raises $1B Series B, hitting $4B total for a fusion record
What's the deal? Commonwealth Fusion Systems (CFS) has raised $1 billion in a Series B round backed by Google and Eni. The Devens, Massachusetts company said the raise brings its total capital to $4 billion.
Why it matters: The $1 billion round sits in the top 1% of Series B rounds in its sector over the trailing 48 months, based on a sample of 138 deals. CFS calls it the single largest funding round among fusion companies worldwide since its $1.8 billion Series B in 2021.
By the numbers: The round follows an $863 million raise last year. CFS says its $4 billion total represents about 30% of all capital raised across the fusion industry to date.
What's the endgame? CFS is developing compact tokamak reactors that use high-temperature superconducting magnets to confine superheated plasma. The funds will complete assembly of its SPARC demonstration machine and advance ARC, its planned grid-scale power plant in Chesterfield County, Virginia.
CFS targets first plasma from SPARC in 2027 and grid power in the early 2030s. The 400MW ARC plant is being developed with Dominion Energy, and CFS has filed an interconnection request with PJM Interconnection, the largest US wholesale electricity market. Google and Eni, both investors, signed power purchase agreements to buy more than half the plant's output.
Who's backing it? CFS said its investor base widened to include pension funds, sovereign wealth funds, infrastructure investors, and industrial corporate partners. It credited the maturing capital stack to visible progress on SPARC and ARC.
"In the 2030s, we will put commercial fusion on the grid," said chief executive officer and co-founder Bob Mumgaard. "We have the science that works and the proven execution that's consistently validated by the market."
The signal: Fusion is drawing capital from the biggest names in tech and energy, as demand for carbon-free power grows. Google has also backed TAE Technologies, and Helion signed the first fusion offtake deal with Microsoft in 2023 — but CFS's $4 billion war chest, and its record round, put it well ahead of the field.
Read more: datacenterdynamics.com, prnewswire.com, finsmes.com
Image credit: Commonwealth Fusion Systems