Slashing CO2

Founded: 2017

HQ: Cambridge, MA

Plasma-taming fusion magnets.

Big Picture

Fusion, the power of the stars, is the holy grail of clean energy: limitless, dispatchable, concentrated, and carbon-free. Unlike conventional nuclear, there is inherently no risk of meltdown, proliferation, or waste. Since the dawn of the nuclear age, scientists have sought to harness fusion, yet achieving net energy gain—where the reactor puts out more energy than it needs to run it—has proven elusive. 

How It Works

Fission splits atoms, whereas fusion joins them. However, the immense pressure and energy needed to generate a 100m°C plasma – superheated matter composed of atoms so hot, they’ve lost their electrons – for fusion to occur is extremely difficult to sustain. While others seek to make bigger magnets, CFS has made the most powerful magnets, that can confine plasma long enough to harness its power. 

Unfair Advantage

What gives CFS the surest path to commercial fusion is the combination of proven tokamak physics with breakthrough magnet technology. They have developed new, high-temperature superconducting tape to build the world’s most powerful magnets. This enables 60x smaller, more affordable reactors that accelerate the path to commercial fusion energy in time and on a scale to make a difference. 


Gigatons of CO2e

potentially avoided by 2050


Bob holds a PhD in applied plasma physics and a Master’s in nuclear science and Engineering from MIT.


Dan holds a PhD in applied plasma physics from MIT, where he also did his Postdoc.

Brandon Sorbom CSO & CO-FOUNDER

Brandon holds a PhD in nuclear science and engineering from MIT, where he also did his Postdoc.

Nuclear-fusion startup lands $1.8 billion as investors chase star power

The Wall Street Journal

Massachusetts start-up hopes to move a step closer to commercial fusion

The New York Times

Compact Nuclear Fusion Reactor Is ‘Very Likely to Work,’ Studies Suggest

New York Times

Nuclear fusion power inches closer to reality

The Washington Post