Scaling the Sun: Proxima Fusion’s €140 Million Bet on Superconducting Sovereignty

By TechCrunch Staff
September 10, 2026

In the high-stakes race to commercialize fusion energy—the "holy grail" of clean power—the bottleneck is rarely just the physics of the plasma; it is the supply chain of the components required to tame it. On Wednesday, Germany-based fusion pioneer Proxima Fusion announced a major strategic pivot toward vertical integration, revealing plans to construct a €140 million ($162.6 million) state-of-the-art facility dedicated to the production of high-temperature superconducting (HTS) tape.

This massive capital expenditure marks a turning point for the startup, which recently vaulted into the upper echelons of the global fusion sector following a landmark €411 million funding round. By bringing the production of HTS tape—a critical, often scarce material—in-house, Proxima is signaling that it is no longer content to rely on the global market to secure the "nervous system" of its future reactors.

Main Facts: Securing the Supply Chain

The new factory is not merely an expansion; it is a defensive move against a constrained global market. Currently, the vast majority of HTS tape is manufactured in China and Japan. For a European company aiming to deploy reactors that will serve as the backbone of the continental energy grid, relying on long-distance, geopolitically sensitive supply chains is a risk that Proxima leadership is no longer willing to take.

Proxima Fusion’s reactor design relies on the generation of ultra-powerful magnetic fields to contain plasma—the superheated state of matter where fusion occurs. HTS tape is the essential material for these magnets. Without it, the compact, high-efficiency reactors that define the "new wave" of fusion startups would be physically impossible.

The factory project will be financed through a strategic blend of private capital and public support. Notably, the state of Lower Saxony has committed €21 million to the project, underscoring the German government’s commitment to establishing a domestic fusion industrial base.

Chronology: The Road to the Factory

The decision to build this facility follows a whirlwind of milestones for Proxima Fusion:

• 2023–2024: Proxima Fusion stabilizes its core stellarator design, proving that advanced computational modeling could overcome the traditional stability issues of early fusion prototypes.
• August 2026: The company closes a €411 million Series C-plus funding round, cementing its position as one of the best-funded fusion startups in the world. Investors express confidence in the firm’s roadmap, specifically its path toward a demonstration power plant.
• September 10, 2026: Proxima Fusion officially announces the €140 million manufacturing facility in Germany, moving from the R&D phase into the "industrialization" phase of fusion energy.

The Physics of HTS: Why It Matters

HTS tape emerged roughly a decade ago as the single most important breakthrough for private fusion companies. Before the widespread availability of these tapes, superconducting magnets required liquid helium cooling to reach near-absolute zero temperatures, resulting in massive, cumbersome, and expensive cooling systems.

HTS tape changes the equation. It can maintain superconducting properties at significantly higher temperatures, allowing for magnets that are both stronger and more compact. This enables a smaller "reactor footprint," reducing the overall capital expenditure (CAPEX) of a power plant.

For Proxima, the scale of demand is immense. Their planned demonstration plant will require approximately 20,000 kilometers of HTS tape. When the technology transitions to a commercial-scale power plant, that requirement will double to 40,000 kilometers. By controlling the manufacturing process, Proxima ensures that it can dictate its own development timeline rather than being subject to the lead times of international suppliers.

Official Responses and Strategic Intent

While the company has remained focused on its core engineering goals, the move into manufacturing has been framed as an essential step toward "fusion sovereignty."

"Our mission has always been to bring fusion to the grid," a company spokesperson noted. "You cannot reach commercial viability if you are perpetually waiting on the supply chain. By building our own production capabilities, we are ensuring that when we are ready to build, the materials will be ready for us."

Local government officials in Lower Saxony have echoed this sentiment, framing the investment as a win for the region’s high-tech manufacturing sector. The €21 million in public support is designed not just to help Proxima, but to foster an ecosystem of expertise in superconducting materials within the region.

Implications: Beyond Fusion

The ripple effects of this investment extend far beyond the fusion industry. While Proxima is focused on energy, the market for HTS tape is heating up across the tech sector.

As noted by industry analysts, companies such as Veir are currently exploring the use of HTS materials to modernize the power grid and enhance the efficiency of data centers. As artificial intelligence and high-performance computing continue to drive electricity demand to unprecedented levels, the ability to transport and manage massive amounts of power with minimal loss—a task facilitated by superconducting technology—is becoming a trillion-dollar problem.

Proxima’s move could set a precedent for other fusion companies. If the fusion industry proves it can successfully vertically integrate, we may see a wave of "fusion-industrial" conglomerates emerging, each controlling their own supply of HTS tape, vacuum chambers, and tritium-breeding blankets.

The Competitive Landscape

The race to build these reactors is effectively a race to see who can build the most efficient supply chain. With Proxima Fusion now controlling its supply of HTS, competitors will face increased pressure to either secure their own long-term supply contracts or follow suit with their own manufacturing investments.

For investors, this shift represents a maturation of the fusion sector. The "science experiment" phase is clearly over; the "industrialization" phase has begun. Proxima is betting that the company which controls the supply chain will ultimately be the company that controls the market for clean, limitless energy.

Looking Ahead: The Challenges

Despite the optimism, the road ahead remains treacherous. Constructing a facility capable of producing high-grade superconducting tape at scale is an engineering feat in its own right. Maintaining the precise structural integrity of the tape—which is often composed of complex, thin-film layers—requires extreme quality control. Any defect in the tape can lead to a "quench," where the magnet loses its superconducting state, potentially damaging the entire reactor.

Proxima will need to recruit top-tier material scientists and manufacturing engineers to ensure that the German facility reaches full capacity by the projected date. Furthermore, the company must continue to navigate the regulatory environment, ensuring that the integration of these domestically produced components meets international safety standards for fusion power.

As of September 2026, the global sentiment toward fusion remains cautiously optimistic. Proxima Fusion has successfully positioned itself as a leader, not just in plasma physics, but in the industrial logistics of the future. Whether this €140 million investment pays off in the form of a functioning, grid-connected reactor remains to be seen—but for the first time, the "fusion of the future" feels like a tangible, manufactured reality.

Summary of Key Data Points

• Total Investment in Facility: €140 Million ($162.6 Million USD).
• Public Contribution: €21 Million from Lower Saxony.
• Tape Requirement (Demo): 20,000 kilometers.
• Tape Requirement (Commercial): 40,000 kilometers.
• Primary Material: High-Temperature Superconducting (HTS) Tape.
• Current Global Market Leaders: China and Japan.

Proxima Fusion’s announcement is a signal to the world: the energy transition is moving into the factory, and the era of fusion is no longer just a theoretical possibility—it is becoming a construction project.