Faraday Factory Japan to Supply HTS Tape for Proxima Fusion's Demo Stellarator Magnet
Faraday Factory Japan has agreed to supply high-temperature superconductor tape for the demonstration magnet of Proxima Fusion, a German stellarator developer. The deal supports Proxima’s next milestone, a superconducting demo magnet, on the way to its planned Stellaris power plant. It adds to Faraday Factory’s growing list of fusion customers.
Faraday Factory joins Proxima’s demo-magnet effort
On 20 June 2025, Faraday Factory Japan announced an agreement to deliver high-temperature superconductor (HTS) tape for the demonstration stellarator magnet of Proxima Fusion. The demo magnet is a step on Proxima’s path toward Stellaris, its planned commercial fusion power plant. Faraday Factory noted that it had grown its tape production roughly tenfold since 2020.
A supply agreement at the demonstration-magnet stage is significant because it commits real material to a specific machine. For a fusion developer, securing tape is one of the gating constraints, since a full reactor needs the wire in large quantities.
The stellarator is a distinct route to fusion
Most compact fusion attention goes to the tokamak, but the stellarator is a different confinement design that twists its magnetic field with intricately shaped coils rather than relying on a current driven through the plasma. That geometry makes the magnets harder to build, and it places heavy demands on the superconductor.
The common thread is the material. HTS tape, the rare-earth barium copper oxide (REBCO) conductor described in our materials guide, carries high currents in strong magnetic fields, which is what lets a stellarator reach the field strengths it needs in a practical size.
Another supplier tie in a scaling industry
The agreement is one of a series of fusion supply deals across the industry as developers lock in wire and manufacturers expand to meet them. Faraday Factory’s fusion deliveries, which passed 5,000 km in 2024, feed several competing reactor concepts. The company’s role sits alongside other suppliers in our project tracker.