Munich-based Proxima Fusion secured €411 million in a funding round to accelerate the development of Europe’s first commercial stellarator power plant.
The deal represents a significant shift in the financing of deep-tech infrastructure, moving fusion energy from the realm of academic research into industrial reality.
Proxima Fusion and the engineering of the stellarator
Google’s participation underscores the technology’s role in meeting the massive energy demands of artificial intelligence and data centres, while RWE’s direct investment of €25 million provides the engineering and grid-integration expertise required to transition from laboratory prototypes to utility-scale production.
By anchoring the project at a former nuclear fission site in Gundremmingen, Bavaria, the partnership intends to repurpose existing high-voltage infrastructure to slash capital expenditure and speed up deployment.
The core of Proxima Fusion’s strategy relies on the stellarator, a fusion reactor design that differs fundamentally from the more common tokamak. While tokamaks use a symmetrical, doughnut-shaped chamber to confine plasma, stellarators utilise a complex, twisted magnetic coil system.
This geometry allows the reactor to maintain superheated plasma in a steady state, avoiding the disruptive “disruptions” or pulses associated with tokamak operations. For industrial-scale power generation, this continuous operation is a critical requirement for baseload stability.
Engineering these twisted coils was historically a mathematical and manufacturing nightmare, but modern computational power and 3D simulation have made the stellarator a viable commercial prospect. In the context of manufacturing execution system strategies, the precision required to fabricate these superconducting magnets represents the highest tier of industrial engineering.
Proxima Fusion is leveraging the legacy of the Wendelstein 7-X project, the world’s most advanced stellarator located in Greifswald, to refine its commercial design.
The complex magnetic topology of the stellarator inherently provides better plasma stability, which reduces the mechanical stress on the reactor walls. This longevity is vital for the economic viability of a fusion plant, as it extends the service life of the first-wall materials.
By securing €411 million, the Munich-based firm now has the runway to move from computer models to physical hardware, testing the tolerances and heat-exhaust capabilities of their “Stellaris” concept at scale.
Solving the plasma confinement challenge with AI
A major reason for Google’s interest in this round is the intersection of nuclear physics and machine learning. Managing a fusion reaction involves controlling magnetic fields in real-time to prevent the 100-million-degree plasma from touching the reactor walls.
This requires processing vast amounts of sensor data with microsecond latency, a task where AI systems provide a blueprint for stability that human operators cannot match. Google’s expertise in high-performance computing makes them more than just a financial backer; they are a technical partner in the control-loop engineering.
The computational demands for stellarator optimisation are immense. Algorithms must calculate the precise shape of magnetic fields to ensure the plasma stays confined while allowing for the removal of helium ash. Proxima Fusion uses these digital twins to simulate millions of coil configurations before a single piece of copper or superconductor is wound.
This hardware-software integration is what convinced heavyweight investors like KfW Capital and SPRIND to join the €411 million round.
Strategic partnership with RWE for grid integration
The Memorandum of Understanding signed between Proxima Fusion and RWE is perhaps the most industrially significant aspect of this announcement. RWE is not just providing €25 million in cash; they are providing the “plug” for the fusion reactor. The choice of the Gundremmingen site in Bavaria is a masterclass in industrial recycling.
As a former nuclear fission hub, the site already possesses the high-voltage transformers and transmission lines capable of carrying gigawatts of power to the German industrial heartland.
Building a new power plant from scratch usually involves years of permitting for new transmission corridors. By moving into a legacy nuclear site, Proxima Fusion bypasses one of the largest bottlenecks in the energy transition. This approach mirrors other successful industrial shifts, such as how Mach Industries secured supply chains by acquiring existing specialist facilities.
The Gundremmingen project will serve as a pilot for how Europe can retire its fossil fuel and fission assets without abandoning the valuable grid infrastructure connected to them.
Furthermore, the partnership provides Proxima Fusion with access to a highly skilled workforce accustomed to the stringent safety and operational protocols of nuclear environments. Engineering a fusion plant requires pipefitters, welders, and technicians who understand high-pressure systems and radiation shielding. RWE’s existing talent pool in Bavaria provides a ready-made workforce to keep the project on schedule for its 2030s target.
Industrial scale and the European deep-tech ecosystem
With a valuation of €2.4 billion, Proxima Fusion has become a “sovereign” tech champion for Europe. The financing round saw broad participation from European venture capital, including Plural, UVC Partners, and Balderton Capital. This collective backing signals a newfound appetite in Europe for capital-intensive, high-risk engineering projects that were previously dominated by American firms like Commonwealth Fusion Systems or Helion Energy.
The industrial output required to build a commercial stellarator will ripple through the European supply chain. From specialised vacuum chamber manufacturers to cryogenic cooling experts, the Proxima project will act as a major customer for high-precision engineering firms.
This is not a software startup scaling in the cloud; this is a heavy industrial undertaking that requires thousands of tonnes of specialised steel and kilometres of superconducting wire.
The successful scaling of Proxima Fusion also provides a template for other “Moonshot” technologies in the region. By combining public-backed funds like SPRIND with global corporate giants like Google, the Munich team has found a hybrid funding model that balances long-term research needs with commercial urgency.
This structure is intended to prevent “brain drain,” ensuring that breakthrough physics discovered at the Max Planck Institute for Plasma Physics stays in Europe and turns into a domestic manufacturing industry.
The engineering roadmap to the 2030s
Despite the massive funding, the path to a commercial fusion reaction remains an uphill battle. Proxima Fusion must now prove that its stellarator design can achieve “Q-greater-than-one”—producing more energy than is required to heat the plasma. While the Wendelstein 7-X has proven the stability of the design, it was never built to produce net energy.
Proxima’s next phase involves building a high-field demonstrator that uses new-generation High-Temperature Superconductors (HTS) to shrink the size and cost of the magnets.
The use of HTS magnets is the key engineering lever for the next decade. These magnets allow for much stronger magnetic fields at higher temperatures than traditional liquid-helium-cooled magnets. Higher fields mean better confinement in a smaller volume, which translates directly to lower construction costs.
If Proxima can successfully integrate HTS technology into the twisted geometry of the stellarator, they will have a product that is not only technically superior but also commercially competitive with offshore wind and traditional nuclear power.
Current industrial activity in Munich is focused on finalizing the magnet sub-assembly designs. Proxima Fusion plans to spend the next several years in a rigorous prototyping phase, testing the resilience of their divertors—the “exhaust pipes” of the reactor—against the intense heat flux of the plasma.
By the time they break ground on the full-scale Gundremmingen plant, every component will have undergone thousands of hours of digital and benchtop stress testing.
For the broader engineering community, the Proxima Fusion story is a clear signal that the energy transition is entering its most ambitious phase. The move from theoretical physics to a €411 million industrial project suggests that the era of fusion power is no longer “thirty years away.”
With the backing of the world’s largest data company and one of Europe’s largest utilities, the magnets are finally being wound for a new kind of power grid.
This development carries significant weight for industrial hubs globally. In regions like Africa, where grid reliability is often a constraint on manufacturing growth, the eventual export of modular stellarator technology could provide a compact, carbon-free baseload power source. While the immediate focus remains on the Bavarian pilot, the engineering successes achieved in Munich will determine the feasibility of fusion power as a global industrial solution.
