tech

January 8, 2026

Commonwealth Fusion Systems installs reactor magnet, lands deal with Nvidia

The fusion power frontrunner said that construction on its Sparc reactor was proceeding as planned. Meanwhile, it's building a digital twin to help dial it in.

Commonwealth Fusion Systems installs reactor magnet, lands deal with Nvidia

TL;DR

  • CFS installed the first magnet in its Sparc fusion reactor at CES 2026.
  • The Sparc reactor will have 18 magnets to create a magnetic field for plasma confinement.
  • The goal is for the plasma to release more energy than is used to heat and compress it.
  • CFS is working with Nvidia and Siemens to develop a digital twin of the reactor for faster learning and experimentation.
  • The company has raised nearly $3 billion to date.
  • CFS estimates its first commercial-scale power plant, Arc, will cost several billion dollars more.

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