Tour of Commonwealth Fusion Systems in Devens, MA

The dream of a nuclear fusion energy source has been discussed for decades, but no one has been able to crack it. Now, a handful of ambitious young companies seem to be within reach of doing so. Commonwealth Fusion Systems in Devens, MA, is one of them. The recent recipient of nearly $3 billion in federal funds, CFS is well-positioned to achieve this elusive goal.  

Long Now Boston has arranged for an exclusive guided tour of the CFS tokamak and other accessible areas on December 15, 2025 at 10 am. This event has tight attendance limits so join now if you’re interested in this rare opportunity.

Decades of worldwide, government-sponsored research in fusion science have established the tokamak-based configuration as the highest performing  approach to fusion. Yet in the past, tokamaks had to be enormous in size to produce net energy from fusion. CFS is using revolutionary high temperature superconducting magnets developed in collaboration with MIT to build smaller and lower-cost tokamak fusion systems. The company is manufacturing these magnets and building the world’s first commercially-relevant net energy fusion machine, called SPARC. SPARC will pave the way for the world’s first fusion power plant, called ARC. 

Can CFS be the first to design, build, and scale fusion power plants that will deliver cost-competitive, clean fusion energy to combat climate change? Come immerse yourself in the science and policy of what could be an energy game changer! 

All attendees must register by Dec 11 in order to attend! Members will have priority until Dec. 7, after which we will open remaining spots to non-members. Before and at the event you will need to show a government ID with the same name you registered under.

TOUR PREPARATIONS

Please be mindful that the tour may be conducted on a very active construction site. For your safety, guests may not be allowed to tour if they are not properly dressed.

• Long pants are required. Dresses or shorts are not allowed on the construction site.
• Closed toe and hard-soled shoes only. NO TENNIS SHOES. NO SANDALS. NO HIGH-HEELS. Proper footwear is very important on the site.
• CFS will provide a hard hat, safety vest and eye protection.