Commonwealth Fusion Systems seeks grid link for first ARC fusion plant
CFS filed to connect ARC to PJM, putting its first 400-megawatt fusion plant on the grid path for the early 2030s.
Commonwealth Fusion Systems has applied to connect its first ARC fusion power plant to PJM Interconnection, putting the project into the grid queue for the largest competitive wholesale electricity market in the United States. The filing does not mean ARC is cleared to run, but it does move the company from reactor ambition into the technical and commercial process of securing a place on the transmission system.
An interconnection request typically triggers studies of grid capacity, needed network upgrades, operating characteristics and the plant’s fit with market and reliability rules. ARC is CFS’s first grid-scale fusion power plant. When it arrives in the early 2030s, it is expected to deliver about 400 megawatts of clean, zero-carbon power. The first ARC plant will be built at its Fall Line Fusion Power Station in Chesterfield County, Virginia, and CFS intends to finance, build, own and operate it.
PJM serves 67 million people in all or parts of 13 states and the District of Columbia, and it is the largest power grid in North America. A place in that system can take years to secure, especially for a new kind of generation. By applying now, CFS is planning for the transmission and market plumbing that have to exist before any megawatts can reach customers.
CFS announced on June 30, 2025 that Google had signed an offtake agreement for 200 megawatts from ARC and was increasing its corporate investment in the company. In January 2026, CFS said it had raised $863 million in its latest investment round. SPARC is being built with MIT’s Plasma Science and Fusion Center in Devens, Massachusetts, and is intended to be the world’s first fusion device to produce plasmas that generate more energy than they consume.
In 2026, industry and PJM materials put more than 800 new generation projects into PJM’s reformed interconnection process, and one queue analysis put 810 other projects alongside CFS’s fusion plant. On April 28, 2026, CFS was the first fusion energy firm trying to connect to a major U.S. grid.
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