Powering the Star: Proxima Fusion’s €140 Million Bet on Superconducting Sovereignty
MUNICH, Germany — In a move that signals a decisive shift in the global race for clean energy, Proxima Fusion, the Max Planck Institute spin-out, has announced the construction of a €140 million ($162.6 million) dedicated manufacturing facility for high-temperature superconducting (HTS) tape. This strategic pivot into vertical integration marks a critical milestone for the European fusion ecosystem, aiming to break the continent’s reliance on East Asian supply chains for the "miracle material" that makes modern fusion reactors possible.
The announcement, made on Wednesday, follows a record-breaking year for the Munich-based startup. With a fresh infusion of capital and state-backed support, Proxima Fusion is no longer just designing a reactor; it is building the industrial infrastructure necessary to realize a commercial fusion power plant on European soil.
I. Main Facts: Securing the Sinews of Fusion
The centerpiece of Proxima Fusion’s latest expansion is a state-of-the-art factory located in the German state of Lower Saxony. The total investment of €140 million is a joint venture of private capital and public subsidies, with the state government of Lower Saxony contributing a critical €21 million grant to anchor the project.
The primary objective of the facility is the mass production of HTS tape, a material composed of rare-earth barium copper oxide (REBCO) coated onto thin metal buffers. For Proxima, this tape is the literal lifeblood of their reactor design. The company’s planned demonstration plant is projected to require 20,000 kilometers of HTS tape, while a full-scale commercial power plant will necessitate upwards of 40,000 kilometers.
Currently, the HTS market is dominated by a handful of suppliers in Japan and China. By establishing its own production line, Proxima Fusion is insulating itself from geopolitical supply shocks and the rising costs associated with the global scarcity of superconducting materials. The factory is expected to reach full operational capacity by 2028, coinciding with the assembly phases of Proxima’s first pilot stellarator.
II. Chronology: From Academic Theory to Industrial Might
The journey of Proxima Fusion is inextricably linked to the history of the Wendelstein 7-X (W7-X) stellarator at the Max Planck Institute for Plasma Physics (IPP).
- 2015–2022: The Proof of Concept. While the world focused on the massive ITER tokamak project in France, the W7-X in Greifswald, Germany, proved that the "stellarator" design—a complex, twisted magnetic ring—could maintain stable plasma for long durations.
- January 2023: The Birth of Proxima. Recognizing the commercial potential of the IPP’s breakthroughs, a team of scientists and engineers founded Proxima Fusion. Their goal was to use advanced computational modeling to refine the stellarator design into a compact, economical power plant.
- 2024–2025: Scaling the Capital. Proxima successfully navigated several funding rounds, moving from a €7 million pre-seed to a significant Series A. During this period, the company focused on "QI" (Quasi-Isodynamic) stellarator designs, which use HTS magnets to achieve better plasma confinement than previous models.
- August 2026: The €411 Million Milestone. Just one month ago, Proxima Fusion closed a massive €411 million funding round, vaulting it into the upper echelon of the world’s best-funded fusion startups, alongside giants like Commonwealth Fusion Systems (CFS) and Helion Energy.
- September 10, 2026: The Manufacturing Pivot. With the capital secured, Proxima moves from design to industrialization, announcing the €140 million HTS factory in Lower Saxony to secure its supply chain.
III. Supporting Data: The Physics and Economics of HTS
To understand why Proxima is investing nearly $163 million into a single component, one must look at the transformative nature of High-Temperature Superconductors.
The Magnetic Advantage
Fusion requires heating a plasma of hydrogen isotopes to over 100 million degrees Celsius—hotter than the core of the sun. No physical container can hold this plasma; it must be suspended in a "magnetic bottle."
- Low-Temperature Superconductors (LTS): Used in older designs like ITER, these require cooling to near absolute zero (4 Kelvin) using liquid helium. They are bulky and limited in the magnetic field strength they can generate (typically 5–10 Tesla).
- HTS Tape: Can operate at "high" temperatures (around 77 Kelvin, the temperature of liquid nitrogen) and generate fields exceeding 20 Tesla.
Because magnetic confinement efficiency scales with the fourth power of the magnetic field strength, doubling the field allows a reactor to be 16 times smaller while producing the same power. This reduction in scale is what makes a "commercial" fusion plant economically viable.
Supply Chain Pressures
The demand for HTS tape is projected to grow exponentially. Currently, global production is measured in hundreds of kilometers per year. Proxima’s requirement for 40,000 kilometers for a single plant represents a massive percentage of current global capacity.
- Cost Projection: In 2023, HTS tape cost approximately $50–$100 per meter.
- Proxima’s Target: Through internal manufacturing and economies of scale, Proxima aims to drive this cost down by 60% by 2030, making the capital expenditure (CAPEX) of a fusion plant competitive with advanced fission or offshore wind.
IV. Official Responses: A Vision for "Fusion Valley"
The announcement has been met with significant enthusiasm from both the private sector and German political leadership, who see this as a "Sputnik moment" for European industrial policy.
Francesco Sciortino, CEO of Proxima Fusion, emphasized the strategic necessity of the move:
"We cannot build the future of energy on a fragile supply chain. HTS tape is the most critical ingredient for our stellarators. By bringing production in-house and partnering with the state of Lower Saxony, we are ensuring that the heart of our technology remains European. This factory isn’t just about Proxima; it’s about building the industrial base for a fusion-powered continent."
Stephan Weil, Minister-President of Lower Saxony, commented on the state’s €21 million investment:
"Lower Saxony has a long history of industrial excellence. By supporting Proxima Fusion, we are positioning our region at the center of the next great energy revolution. This facility will create high-tech jobs and anchor a new ‘Fusion Valley’ that will benefit the entire German economy."
Dr. Jorrit Lion, Co-founder and HTS Lead at Proxima, highlighted the technical synergy:
"Producing our own HTS tape allows us to iterate on the magnet design in real-time. We can optimize the tape’s architecture specifically for the complex geometries of a stellarator, something that off-the-shelf components from third-party suppliers simply cannot match."
V. Implications: Beyond the Reactor Core
The establishment of a massive HTS production facility in Germany has implications that reach far beyond the quest for fusion energy.
1. Geopolitical Autonomy
The energy transition has often been criticized for trading a dependence on Middle Eastern oil for a dependence on Chinese minerals and manufacturing. By developing HTS capabilities in Europe, Germany is securing a "deep tech" sovereignty. If fusion becomes the dominant energy source of the 2040s, the nations that control the HTS supply chain will hold the keys to the global economy.
2. The Ripple Effect on Other Industries
While fusion is the "killer app" for HTS, the tape has myriad other applications.
- Data Centers: Companies like the Microsoft-backed Veir are exploring HTS to create megawatt-class superconductors for data centers, reducing energy loss in power transmission to nearly zero.
- Medical Imaging: Next-generation MRI machines using HTS can provide higher resolution at a lower cost, without the need for scarce liquid helium.
- Aviation: HTS is seen as a potential enabler for electric propulsion in large aircraft, where weight-to-power ratios are currently the primary barrier.
3. The "Stellarator" vs. "Tokamak" Race
Proxima’s investment reinforces the viability of the stellarator. While the tokamak (used by Commonwealth Fusion Systems) is more common, the stellarator is inherently stable and can operate in a "steady state" without the risk of plasma disruptions. The primary barrier to stellarators was their geometric complexity, which required precision engineering and high-performance magnets. Proxima’s factory addresses the magnet bottleneck head-on, potentially giving the stellarator the edge in the race to the first commercial kilowatt-hour.
4. Climate Goals and the 2050 Horizon
With the factory slated for full operation by 2028, Proxima remains on track for its goal of a commercial pilot plant by the mid-2030s. If successful, this timeline aligns with global "Net Zero 2050" targets, providing a carbon-free, baseload power source that can complement intermittent renewables like wind and solar.
In the high-stakes world of climate tech, Proxima Fusion’s €140 million gamble is more than just a factory announcement; it is a declaration of intent. As the world watches, the fields of Lower Saxony may soon become the birthplace of the technology that finally bottles the sun.
Reporting by the Climate Tech Desk.
Updated: September 10, 2026, 11:38 AM PDT.
