Commonwealth Fusion Systems

Commonwealth Fusion Systems (CFS) is developing fusion power plants that use powerful magnetic fields to contain a plasma hot enough to spark fusion reactions. TechCrunch reports that CFS plans to harvest the heat from the reaction to power a steam turbine.^[1],[2]

Commonwealth Fusion Systems developed high-temperature superconducting (HTS) magnets in collaboration with MIT, according to its technology page. The company says the magnets allow stronger magnetic fields, which can enable smaller fusion systems at lower cost, and that it has built a 20 tesla, large-bore magnet, which it demonstrated in 2021.^[3],[1]

Commonwealth Fusion Systems is assembling SPARC, a tokamak demonstration machine, on a 60-acre campus in Devens, Massachusetts. The company says SPARC will produce more energy from fusion than it needs to power the process in 2027, a threshold it calls net energy generation or Q>1.^[1]

Commonwealth Fusion Systems is targeting scientific breakeven with SPARC, which TechCrunch describes as the point at which fusion reactions release more energy than the reactor consumes to ignite them. TechCrunch says only one fusion device, at Lawrence Livermore National Laboratory's National Ignition Facility, has achieved it, and that reaching it would not by itself generate electricity for the grid.^[2]

Commonwealth Fusion Systems plans ARC as its first grid-scale fusion power plant, designed to supply about 400 megawatts to the grid from the early 2030s. The plant will sit at the Fall Line Fusion Power Station in Chesterfield County, Virginia.^[4],[5]

Commonwealth Fusion Systems has not disclosed the cost of SPARC or ARC, according to TechCrunch. The article notes that Virginia's former governor Glenn Youngkin said in 2024 that ARC would be a "multi-billion-dollar fusion power plant."^[2]

Commonwealth Fusion Systems spun out of MIT in 2018. The company says it was born from the realization that new magnet technology, specifically high-temperature superconductors, brings fusion energy within reach.^[6],[7]

Commonwealth Fusion Systems announced a $1.8 billion Series B round in 2021, the same year it demonstrated its 20 tesla HTS magnet.^[5],[3]

Commonwealth Fusion Systems said on April 28, 2026 that it had become the first fusion power plant developer to apply to connect to a major grid. The application asks PJM Interconnection, which serves about 182,000 megawatts of capacity to more than 65 million customers, to connect the first ARC plant.^[8]

Commonwealth Fusion Systems announced on July 30, 2026 that it raised $1 billion of additional equity financing. The company says the round was the single largest among fusion energy companies since its own $1.8 billion Series B in 2021.^[5],[2],[9]

Commonwealth Fusion Systems says it has now raised a total of $4 billion, which it describes as about 30 percent of the total capital raised by the fusion industry.^[5],[7]

Commonwealth Fusion Systems said investors in the $1 billion round included pension funds, sovereign wealth funds, infrastructure investors and industrial corporate partners. TechCrunch reports the company declined to name specific investors when asked.^[5],[2],[9]

Commonwealth Fusion Systems announced on September 10, 2026 that Hyundai Motor Group became an investor during the $1 billion fundraise, which it called the first step in a partnership to explore collaboration on future ARC plants. The release also lists other Asia-Pacific investors in CFS: Woori Venture Partners, a consortium of Japanese industrial companies led by Mitsui & Co. and Mitsubishi Corporation, Temasek, and Hostplus Superannuation Fund.^[9],[5]

Commonwealth Fusion Systems raised $863 million in 2025, according to its July 2026 release. TechCrunch says that earlier round, announced the previous August, included Nvidia, Google, Khosla Ventures and Breakthrough Energy Ventures among its investors.^[5],[2]

Commonwealth Fusion Systems announced on June 11, 2026 that Plynth Energy, an Abu Dhabi government-owned early-stage fund, acquired a minority stake. At that point the company said it had raised more than $3 billion since its founding in 2018.^[10]

Commonwealth Fusion Systems signed a letter of intent on October 22, 2026 for a proposed $85 million federal R&D award from the U.S. Department of Commerce under the CHIPS and Science Act. The award would support semiconductor technologies used in commercial fusion energy, and the release describes it as proposed.^[11]

Commonwealth Fusion Systems said it will use the funds raised to further accelerate its progress to commercialization, according to World Nuclear News. No opened source states a valuation.^[7]

Commonwealth Fusion Systems is led by Bob Mumgaard, who is chief executive officer and co-founder. The company is headquartered in Devens, Massachusetts.^[5]

Commonwealth Fusion Systems named Stephane Bancel, chief executive of Moderna and a partner at Flagship Pioneering, as an independent member of its board on January 12, 2026. The company says Bancel was also an early investor in CFS.^[12]

Commonwealth Fusion Systems also has Chris Liddell, a former White House official who has served as CFO at Microsoft and General Motors, as an independent board member. The Bancel release says CFS announced Liddell's appointment in August and calls Bancel the second new board member in the last year.^[12]

Commonwealth Fusion Systems has an offtake agreement with Google for 200 megawatts of fusion power from the first ARC plant in Chesterfield County, Virginia. The company says Google also has the option to purchase power from future plants.^[13],[2]

Commonwealth Fusion Systems has an agreement with Eni, which it describes as one of its earliest investors, to purchase power from the first ARC plant. The company says the deal is worth more than $1 billion, and that Google and Eni together agreed to buy more than half the plant's power.^[13],[5],[9]

Commonwealth Fusion Systems has a joint development agreement with Dominion Energy Virginia, which provides development and technical expertise to connect the first ARC plant to the grid. Dominion also offers leasing rights for the planned site.^[13],[8]

Commonwealth Fusion Systems announced a supply agreement with Fujikura Ltd. on September 30, 2026 to buy more than 10,000 km of HTS tape for its ARC plants. The release is headlined as the largest single purchase order of HTS tape, and says Fujikura is investing in expanding its manufacturing capacity to deliver it.^[14]

Commonwealth Fusion Systems also supplies HTS magnet technology to other fusion developers. Under a long-term partnership with Realta Fusion, CFS will design and build HTS magnets for Realta's fusion systems, and Type One Energy licensed CFS's HTS cable technology to develop magnets for its stellarator.^[13]