Devens, Mass.-based fusion company Commonwealth Fusion Systems (CFS) raised $1 billion in additional equity funding, the company said July 30.
CFS said in a press release the $1 billion financing round is the largest a fusion company has had since 2021 when CFS had a $1.8 billion Series B round then. This recent funding builds on the $863 million the company fundraised in August 2025 and moves the company’s total funding to $4 billion to date.
CFS said that its $4 billion represents nearly 30% of the total funding raised by the fusion industry so far.
“CFS is making what once was impossible into inevitable. In the 2030s, we will put commercial fusion on the grid,” CFS CEO Bob Mumgaard said in the release. “We have the science that works and the proven execution that’s consistently validated by the market. In unlocking commercial fusion energy, we’re on a path to make an impact at a civilizational level.”
Though many fusion companies are not projected to be commercially viable until the mid 2030s and beyond, CFS has made strides towards building its first fusion power plant. The company has a planned site in Chesterfield, Va. for a 400-megawatt plant called ARC. The ARC fusion plant will use the company’s technology SPARC, which is scheduled to be demonstrated next year.
SPARC is a version of tokamak technology, a donut-shaped fusion machine that confines a plasma, which is necessary for fusion. This technology uses high-temperature superconducting magnets and high-magnetic-field design to achieve fusion power, according to the company’s website.
In preparation for commercialization, CFS filed an application to the PJM Interconnection in April. It has also made several strategic partnerships with companies such as Dominion Energy, Google and Eni.