Just reread Sir Arthur Eddington’s 1920 paper, the Internal Constitution of the Stars. He was the first person to figure out how the sun works — the foundation for commercializing fusion energy. I’m still awed by that achievement, so I wrote him a letter: blog.cfs.energy/memo-from-mass…

Looking forward to speaking at #FusionXInvest Global 2025 in #SiliconValley Feb. 12-14. I'll discuss CFS’ approach to #FusionEnergy alongside other industry leaders, and I'm also bringing a superconducting magnet “pancake” for you to check out! events.fusionxinvest.com/global25/

It’s go-time for SPARC! 💫 We’ve officially kicked off construction with the first major piece: the 75-ton cryostat base. It supports the entire machine, maintains ultra-cold temps for our magnet technology, absorbs fusion neutrons, & routes key systems. More #PowerMoves ahead!

Those of us in the fusion energy industry know very well what's going on. But plenty of people don't know just how far we've come and how fast we're moving. Thanks to CNN's Ella Nilsen for helping to show the world our progress making magnets in our factory, and now assembling

CFS recently played host to 60 fusion energy experts to discuss a seemingly secondary, but actually critical detail: how to support not just the hottest parts of the SPARC fusion machine but the cooler regions, too. When SPARC is running it’ll have the largest temperature

High-temperature superconductors (HTS) are the foundation of our fusion energy work here at Commonwealth Fusion Systems. Part of my job for years has been to work with our suppliers to turn this once incredibly scarce resource into a mass-manufactured product we could purchase by the kilometers

CFS Chief Science Officer and Co-founder Brandon Sorbom offers a ground-level view of how we'll assemble the SPARC fusion machine inside Tokamak Hall. SPARC's cryostat base now is in place, and toroidal field (TF) magnets and a vacuum vessel are coming next. Catch the second of

CFS Chief Science Officer and Co-founder Brandon Sorbom offers a ground-level view of how we'll assemble the SPARC fusion machine inside Tokamak Hall. In the third video of this three-part series, Brandon shares a surprising detail on the cranes we use to handle SPARC's large

With Google’s offtake agreement for 200 megawatts of power from our first fusion power plant, ARC, they increase their stake in CFS and help to fund our ARC development work. Making fusion energy happen begins with technical work like science and engineering. But as we make

Why work on our ARC fusion power plant when we haven't yet switched on our SPARC demonstration machine? It's a fair question. And here's our answer: at CFS, we've deliberately charted a path to fusion energy that lets us work in parallel on multiple projects. Our new $863