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§ Private Profile · 117 Hospital Rd Devens, MA 01434
Designs and builds commercial fusion power plants to generate clean energy for the grid, using powerful magnets.
Commonwealth Fusion Systems is a Cambridge, Massachusetts-based energy technology company that designs and constructs commercial fusion power plants utilizing advanced high-temperature superconductor magnets. The organization operates with a workforce of approximately 800 employees and has secured over $2 billion in private capital to finance its reactor development. To accelerate the commercialization of decarbonized power generation for electricity grid operators, the firm collaborates extensively with the Massachusetts Institute of Technology. This strategic partnership with MIT's Plasma Science and Fusion Center supports the engineering of SPARC, a demonstration device intended to achieve net-positive energy output. The business model relies on private investment to deliver commercially viable fusion energy to the broader utility market. Spun out of an academic research initiative, the enterprise was officially founded in 2018 by Bob Mumgaard, Brandon Sorbom, Dan Brunner, and Zach Hartwig.
Commonwealth Fusion has raised $2.9B across 4 funding rounds.
Commonwealth Fusion has raised $2.9B in total across 4 funding rounds.
Commonwealth Fusion Systems (CFS) is a fusion power company developing compact fusion energy systems using high-temperature superconducting (HTS) magnets to enable commercial-scale fusion power plants. It builds the SPARC tokamak, a net-energy fusion device, and plans the ARC tokamak as a grid-connected power plant, serving global energy needs by providing safe, unlimited, carbon-free electricity to replace fossil fuels like coal and natural gas.[1][2][3][6]
CFS addresses the critical gap in clean energy supply amid rising demand and climate challenges, with strong growth momentum: founded in 2018, it has raised over $2 billion—the most of any fusion company—grown to 350+ employees by 2022, opened its Devens, Massachusetts campus in 2023, and begun SPARC construction after demonstrating a 20 Tesla HTS magnet in 2021.[1][2]
CFS spun out from MIT's Plasma Science and Fusion Center (PSFC) in 2018, founded by MIT alumni including CEO Bob Mumgaard, Chief Science Officer Brandon Sorbom, and others like Zach Hartwig and Dan Brunner, who formed the "SPARC Underground" grassroots group.[1][3] The idea emerged from decades of MIT fusion research, particularly the ARC tokamak concept by Dennis Whyte's team, combined with breakthroughs in HTS magnets that enable smaller, more powerful fusion devices; rather than seeking federal grants, they pursued private capital for speed.[1][2][3]
Early traction came swiftly: $50 million from Eni in 2018, followed by a $115 million Series A in 2019 from Breakthrough Energy Ventures (Bill Gates), Khosla Ventures, and others; a landmark 20 Tesla magnet demo in 2021; and $1.8 billion Series B in late 2021 from Temasek, Google, Gates, and Eni to fund SPARC.[1][2]
CFS rides the clean energy transition trend, targeting fusion as the "holy grail" for limitless, carbon-free power from abundant hydrogen isotopes, potentially displacing fossil fuels and enabling net-zero grids.[2][3][6] Timing is ideal amid accelerating climate urgency, AI-driven energy demand, and HTS material advances that finally make compact fusion viable after decades of research.[1][2]
Market forces favor CFS: private capital enthusiasm (e.g., Gates, Google), policy support like DOE INFUSE, and competition from peers like TAE Technologies, but CFS leads in funding and magnets.[1][4] It influences the ecosystem by sharing progress, fostering industry collaboration via the Fusion Industry Association, and proving fusion's commercial path—paving for a full fusion sector.[1][2]
CFS aims to demonstrate net energy with SPARC by late 2020s, followed by ARC power plants on grids within 10-15 years, scaling to commercial fusion globally.[1][2][3] Trends like HTS improvements, AI-optimized plasma control, and falling renewable costs will accelerate this, though challenges remain in tritium safety and supply chains.[5]
Its influence will grow as the fusion frontrunner, potentially unlocking energy abundance if SPARC succeeds, drawing more investment and talent while catalyzing a fusion industry to bridge humanity's energy gap.[2][6]
Commonwealth Fusion has raised $2.9B in total across 4 funding rounds.
Commonwealth Fusion's investors include Dennis Lynch, Bill Gates, Eric Schmidt, Stanley Freeman Druckenmiller, Carmichael Roberts, Brevan Howard, Laurene Powell Jobs, Eni, Nadim Haidar, Maryanna Saenko, Sam Englebardt, Michael Schroepfer.
Commonwealth Fusion has raised $2.9B across 4 funding rounds. Most recently, it raised $863.0M Series B in August 2025.