Proxima designs first integrated commercial fusion power plant

Alongside its partners, the company has published a peer-reviewed paper in Fusion Engineering and Design, presenting Stellaris—the world’s first integrated concept for a commercial fusion power plant designed for reliable, continuous operation. This achievement marks a significant step forward for quasi-isodynamic (QI) stellarators, positioning them as a viable pathway to scalable, sustainable fusion energy.

The Stellaris concept builds upon the record-setting success of the Wendelstein 7-X (W7-X) research experiment in Germany. W7-X, the world’s most advanced QI stellarator prototype, is led by the Max Planck Institute for Plasma Physics (IPP) and has been backed by over €1.3 billion in funding from the German Federal Government and the European Union. Proxima Fusion, as the first spin-out company from IPP, is now leveraging this foundation to propel fusion energy toward commercialization.

The development of Stellaris is a product of a strategic public-private partnership between Proxima Fusion engineers and IPP scientists. With a team composed of top-tier talent from Google, Tesla, McLaren Formula 1, and SpaceX, Proxima Fusion is bringing cutting-edge engineering expertise to fusion technology.

The Stellaris design represents a paradigm shift in fusion power plant development. By utilizing high-temperature superconducting (HTS) magnet technology, Stellaris can generate significantly stronger magnetic fields, allowing for a compact reactor footprint while maintaining unprecedented energy output. The design also exclusively incorporates existing materials and supply chains, ensuring feasibility for near-term construction.

A key differentiator of Stellaris is its simulation-driven engineering approach, which has enabled rapid design iterations through advanced computing. The result is the first QI stellarator power plant concept that successfully meets all major physics and engineering constraints, validated through electromagnetic, structural, thermal, and neutronic simulations. Unlike conventional fusion development, which often progresses incrementally over decades, Proxima Fusion is accelerating the timeline with its upcoming demonstration stellarator, Alpha.

The Stellaris design introduces several critical innovations that advance the viability of stellarator-based fusion energy:

• A magnetic field configuration optimized for stable and efficient energy production
• Robust structural support capable of sustaining full-power operations
• Integration of HTS magnet technology with effective thermal management solutions
• A novel neutron blanket concept tailored to the complex geometry of stellarators