Deep dive: Fusion energy & enabling supply chain — what's working, what's not, and what's next

In December 2025, the European Fusion for Energy agency (F4E) signed procurement contracts worth EUR 4.2 billion for ITER tokamak assembly components, making fusion energy's enabling supply chain one of the fastest-growing specialty manufacturing sectors on the continent. A 2025 Fusion Industry Association survey of 45 private fusion companies found that 78% identified supply chain readiness as their single greatest deployment risk, ahead of plasma physics challenges and regulatory uncertainty. For product and design teams working in advanced materials, precision manufacturing, cryogenics, and power electronics, the fusion supply chain represents both a generational opportunity and a set of engineering problems unlike anything the energy sector has encountered before.

Why It Matters

Europe has positioned itself as the centre of gravity for fusion energy development. ITER, the international thermonuclear experimental reactor under construction in Saint-Paul-lez-Durance, France, is the largest science project in history with a total project cost exceeding EUR 20 billion. Beyond ITER, private fusion ventures have raised over $7.1 billion in cumulative funding through 2025, with European companies including Tokamak Energy (UK), Marvel Fusion (Germany), and Renaissance Fusion (France) collectively securing more than $1.2 billion (Fusion Industry Association, 2025).

The supply chain challenge is fundamental: fusion reactors operate at temperatures exceeding 150 million degrees Celsius, require superconducting magnets cooled to 4 Kelvin (-269 degrees Celsius), must contain plasmas at pressures of several atmospheres using magnetic fields of 10 to 20 Tesla, and demand materials that can withstand neutron bombardment at fluences 10 to 100 times greater than current fission reactors. No existing industrial supply chain can deliver these requirements at scale. Every major component, from the vacuum vessel to the blanket modules to the tritium breeding systems, requires purpose-built manufacturing capabilities that are only now being established.

The economic stakes are significant. The Fusion Industry Association estimates that a mature fusion energy sector would require $40 to $60 billion per year in component manufacturing by the 2040s, with European manufacturers positioned to capture 35 to 45% of that market based on current investment trajectories (FIA, 2025). For design teams at component suppliers, understanding where the supply chain works, where it fails, and where the next opportunities lie is essential for strategic positioning.

Key Concepts

Fusion energy supply chains differ from conventional energy manufacturing in several critical dimensions. The most important concepts include:

Superconducting magnet systems: Fusion reactors use high-temperature superconducting (HTS) or low-temperature superconducting (LTS) magnets to confine plasma. ITER uses niobium-tin (Nb3Sn) LTS conductors, while next-generation designs from Commonwealth Fusion Systems and Tokamak Energy use rare-earth barium copper oxide (REBCO) HTS tape. Magnet manufacturing requires precision winding, insulation, and cryogenic qualification at scales that exceed any prior application.

Plasma-facing materials: Components in direct contact with the plasma, including the divertor and first wall, experience heat fluxes of 10 to 20 MW per square meter and particle bombardment that erodes surfaces at rates of millimeters per year. Tungsten, beryllium, and advanced tungsten alloys are the primary candidates, but manufacturing these materials in the complex geometries required for fusion components pushes conventional metallurgy to its limits.

Tritium breeding and handling: Deuterium-tritium fusion requires tritium, a radioactive hydrogen isotope with a half-life of 12.3 years and a global inventory of roughly 25 kilograms. Future fusion power plants must breed their own tritium using lithium-containing blanket modules surrounding the plasma. No tritium breeding blanket has been demonstrated at reactor scale, making this one of the most consequential supply chain gaps.

Balance of plant: Heat exchangers, turbines, remote handling systems, vacuum pumping systems, and power conversion equipment must operate under conditions far more demanding than those in fission or fossil fuel plants. Remote maintenance systems are particularly critical because activated components inside a fusion reactor cannot be accessed by personnel for years after operation.

What's Working

High-Temperature Superconducting Tape Production

The most significant supply chain success story is the rapid scale-up of REBCO HTS tape manufacturing. SuperOx (Russia/Japan), THEVA (Germany), Fujikura (Japan), SuperPower (US), and SuNam (South Korea) have collectively increased annual REBCO production capacity from approximately 2,000 kilometres in 2020 to over 8,500 kilometres in 2025. THEVA's facility near Munich has expanded capacity to 1,500 kilometres per year, with plans to reach 3,000 kilometres by 2028. Commonwealth Fusion Systems' magnet test in September 2021, which demonstrated a 20-Tesla large-bore HTS magnet, validated that commercially available REBCO tape could meet fusion-grade performance requirements. Tape costs have fallen from approximately $60 per metre in 2020 to $25 to $35 per metre in 2025, though fusion power plant economics likely require prices below $10 per metre (MIT Plasma Science and Fusion Center, 2025).

Precision Vacuum Vessel Manufacturing

European manufacturers have developed world-leading capabilities in fusion-grade vacuum vessel fabrication. The ITER vacuum vessel, a 5,000-tonne double-walled stainless steel structure 19 metres in diameter, is being manufactured in nine sectors by Hyundai Heavy Industries (South Korea), Mangiarotti (Italy), and Equipos Nucleares SA (Spain). Despite significant schedule delays, these manufacturers have demonstrated the ability to achieve the required dimensional tolerances of plus or minus 3 millimetres on structures exceeding 10 metres in dimension, weld quality meeting nuclear-grade RCC-MR standards, and leak-tightness specifications of less than 1 x 10^-8 Pa cubic metres per second (ITER Organization, 2025).

Walter Tosto SpA in Italy has emerged as a critical supplier for fusion vacuum components, delivering ITER cryostat segments and developing manufacturing capabilities for next-generation compact tokamak vessels. The company's investment of EUR 45 million in dedicated fusion manufacturing facilities demonstrates private sector confidence in long-term fusion supply chain demand.

Remote Handling Technology

The UK Atomic Energy Authority (UKAEA) has established global leadership in fusion remote handling through its RACE (Remote Applications in Challenging Environments) facility at Culham. RACE has developed robotic systems capable of performing maintenance operations inside tokamak vessels with positional accuracy of plus or minus 1 millimetre in high-radiation environments. The facility's snake-arm robots, developed in partnership with OC Robotics, can access confined spaces through 100-millimetre diameter ports and perform cutting, welding, and inspection tasks. UKAEA has commercialised this capability through licensing agreements with multiple fusion developers and through its subsidiary UKAEA Ltd, generating over GBP 30 million in commercial revenue in 2025 (UKAEA, 2025).

What's Not Working

Plasma-Facing Component Manufacturing at Scale

Tungsten plasma-facing components remain a critical bottleneck. The ITER divertor requires approximately 300,000 tungsten monoblock elements, each a small cylinder of tungsten bonded to a copper-chromium-zirconium cooling tube using hot isostatic pressing (HIP) or casting techniques. Plansee SE (Austria), the world's leading refractory metals manufacturer, has developed the manufacturing processes but production rates remain far below what would be needed for a fleet of commercial reactors. Each ITER-type divertor cassette requires approximately 18 months of manufacturing lead time, and defect rates in the tungsten-to-copper bond remain at 3 to 5%, requiring extensive non-destructive examination and rework (Plansee, 2024).

The deeper problem is materials qualification. Tungsten becomes brittle under neutron irradiation, and there is no existing neutron source that can replicate the 14.1 MeV neutron spectrum of deuterium-tritium fusion at the fluence levels expected in a power plant. The IFMIF-DONES (International Fusion Materials Irradiation Facility: Demo-Oriented NEutron Source) project in Granada, Spain, is designed to provide this testing capability but is not expected to begin irradiation campaigns until 2032 at the earliest. Until IFMIF-DONES delivers data, plasma-facing material qualification for commercial fusion remains a gap that no amount of manufacturing investment can close (EUROfusion, 2025).

Tritium Supply Chain

The global tritium supply is almost entirely dependent on Canadian CANDU heavy water fission reactors, which produce tritium as a byproduct of neutron capture in deuterium moderator. Ontario Power Generation's Darlington Tritium Removal Facility extracts approximately 2.5 kilograms of tritium per year. With CANDU reactors scheduled for refurbishment and eventual decommissioning between 2030 and 2055, the available tritium inventory is projected to peak at approximately 27 kilograms in the early 2030s and then decline (Canadian Nuclear Safety Commission, 2024).

A single fusion power plant operating at 500 MW thermal would consume approximately 55 kilograms of tritium per year (burning roughly 1 kilogram and requiring 54 kilograms of circulating inventory due to incomplete burnup and processing losses). Even with a tritium breeding ratio of 1.05 to 1.15, the startup inventory requirement for each plant would be 5 to 10 kilograms. This means the existing global tritium supply could support the startup of at most 3 to 5 fusion power plants, creating a severe bottleneck unless tritium breeding technology is demonstrated and commercialised before the first fleet of reactors is ordered.

Lithium-6 Enrichment

Tritium breeding blankets require lithium enriched in the lithium-6 isotope, which constitutes only 7.6% of natural lithium. The US Department of Energy's Y-12 facility in Oak Ridge, Tennessee, which historically produced enriched lithium using the COLEX mercury amalgam process, ceased production in the 1960s, and the technology is now considered environmentally unacceptable. No industrial-scale lithium-6 enrichment facility exists anywhere in the world. Several laboratory-scale enrichment approaches are under development, including laser isotope separation, electromigration, and crown ether chromatography, but none has reached pilot scale. The absence of a lithium-6 supply chain is a frequently overlooked but potentially critical path dependency for fusion commercialisation (US DOE, 2025).

Key Players

Established Companies

Plansee SE: Austrian refractory metals specialist manufacturing tungsten and molybdenum components for ITER and multiple private fusion ventures. Annual revenue exceeding EUR 1.8 billion with dedicated fusion division.

THEVA: German HTS tape manufacturer supplying REBCO conductor for fusion magnet applications. Expanding Munich-area production facility to 3,000 kilometres per year capacity.

Linde Engineering: German cryogenics supplier providing helium refrigeration systems for ITER and next-generation tokamak projects. Operating the world's largest helium liquefaction plant at ITER.

Walter Tosto SpA: Italian pressure vessel and vacuum chamber manufacturer delivering ITER cryostat components and developing compact tokamak vessel manufacturing capabilities.

Vacuumschmelze (VAC): German manufacturer of soft magnetic materials and special alloys supplying superconducting wire and precision components for fusion magnet systems.

Startups and Growth-Stage Companies

Tokamak Energy: UK-based compact spherical tokamak developer that has raised over $250 million. Building the ST80-HTS prototype with plans for a grid-connected demonstrator by the early 2030s.

Marvel Fusion: Munich-based laser fusion company that has raised EUR 60 million to develop a laser-driven inertial confinement approach using nanostructured fuel targets.

Renaissance Fusion: Grenoble-based company developing stellarator-based fusion reactors using novel liquid metal plasma-facing surfaces and HTS magnet technology. Raised EUR 45 million in Series A.

Proxima Fusion: Munich-based stellarator startup spun out of the Max Planck Institute, developing AI-optimised stellarator designs. Raised EUR 20 million in seed funding.

Kyoto Fusioneering: Japan-based fusion engineering company developing integrated plant systems including breeding blankets and heat exchangers. Partnerships with multiple European fusion developers.

Investors and Funders

Breakthrough Energy Ventures: Bill Gates-led fund that has invested in Commonwealth Fusion Systems, supporting HTS magnet development that drives European tape manufacturing demand.

EUROfusion: European consortium of 30 national fusion research organisations coordinating EUR 5.5 billion in Horizon Europe fusion research funding through 2027.

European Investment Bank: Provided EUR 250 million in financing for ITER-related industrial development and has signalled interest in supporting private fusion ventures.

Action Checklist

• Assess current product portfolio for adjacencies with fusion-grade requirements in materials, precision manufacturing, cryogenics, or power electronics
• Engage with EUROfusion's industrial liaison programme to understand upcoming procurement opportunities for DEMO (the post-ITER demonstration reactor)
• Evaluate REBCO HTS tape as a potential product line or integration component given 25 to 30% annual market growth projections
• Investigate tungsten and refractory metal manufacturing capabilities and the premium pricing available for fusion-qualified components
• Monitor IFMIF-DONES construction timeline as the trigger for plasma-facing materials qualification and subsequent procurement waves
• Establish relationships with private fusion developers through the Fusion Industry Association's supplier network programme
• Review remote handling and robotic maintenance capabilities for applicability to fusion vessel access and hot cell operations
• Track tritium supply and lithium-6 enrichment developments as indicators of commercial fusion timeline feasibility

FAQ

Q: When will fusion supply chain demand reach commercially significant volumes? A: The current demand driver is ITER, which represents approximately EUR 1 to 2 billion per year in component procurement through the early 2030s. The next major demand signal will come from DEMO, the European demonstration power plant, which is expected to enter the procurement phase in the 2032 to 2035 timeframe with estimated component costs of EUR 15 to 20 billion. Private fusion companies could begin placing significant orders for pilot plant components as early as 2028 to 2030, though volumes will remain modest (EUR 100 to 500 million per company) until net energy gain is demonstrated and serial production begins.

Q: What materials and manufacturing capabilities transfer from fission nuclear to fusion? A: Several capabilities transfer directly: nuclear-grade stainless steel fabrication and welding (RCC-MR and ASME Section III standards), quality assurance and documentation systems, radiation shielding design, and remote handling for activated components. However, fusion-specific requirements including superconducting magnet manufacturing, plasma-facing component fabrication, tritium handling systems, and 150-million-degree-compatible diagnostics have no fission analogue. Companies with fission nuclear manufacturing credentials have an advantage in quality systems and regulatory familiarity but must invest in fusion-specific technology development.

Q: How does the European fusion supply chain compare to competitors in Asia and North America? A: Europe leads in large-scale tokamak component manufacturing (through ITER procurement), remote handling technology (UKAEA/RACE), and stellarator engineering (IPP Greifswald). North America leads in HTS magnet integration (Commonwealth Fusion Systems) and laser target fabrication (National Ignition Facility ecosystem). Asia leads in HTS tape production volume (Fujikura, SuNam, SuperOx), vacuum vessel fabrication scale (Hyundai Heavy Industries), and integrated plant engineering (Kyoto Fusioneering). European supply chain competitiveness depends on maintaining investment in DEMO procurement readiness and translating ITER experience into commercial manufacturing capability before Asian competitors scale up.

Q: What is the biggest risk to fusion supply chain investment? A: The single largest risk is timeline uncertainty. If commercial fusion is delayed beyond the 2040s due to physics challenges, regulatory obstacles, or tritium supply constraints, investments made in dedicated manufacturing capacity in the late 2020s and early 2030s could face a decade or more without adequate demand. The mitigation strategy is to develop dual-use capabilities where possible: HTS tape serves the growing market for high-field MRI magnets and particle accelerators, precision vacuum technology serves semiconductor manufacturing, and remote handling robotics serves nuclear decommissioning and space applications.

Sources

• Fusion Industry Association. (2025). The Global Fusion Industry in 2025. Washington, DC: FIA.
• MIT Plasma Science and Fusion Center. (2025). High-Temperature Superconducting Magnet Technology: Cost Trajectories and Manufacturing Scale-Up. Cambridge, MA: MIT PSFC.
• ITER Organization. (2025). ITER Construction Status Report: Manufacturing and Assembly Progress. Saint-Paul-lez-Durance, France: ITER Organization.
• UKAEA. (2025). Remote Applications in Challenging Environments: Annual Technology Review. Culham, UK: United Kingdom Atomic Energy Authority.
• Plansee SE. (2024). Tungsten Components for Fusion: Manufacturing Capabilities and Qualification Status. Reutte, Austria: Plansee Group.
• EUROfusion. (2025). European Fusion Research Roadmap: Materials and Components Programme Update. Garching, Germany: EUROfusion Consortium.
• Canadian Nuclear Safety Commission. (2024). Tritium Studies: Production, Supply, and Projected Availability. Ottawa, Canada: CNSC.
• US Department of Energy. (2025). Fusion Energy Sciences: Enabling Technologies and Supply Chain Assessment. Washington, DC: US DOE Office of Science.
• European Fusion for Energy. (2025). ITER Procurement and European Industrial Participation Report. Barcelona, Spain: F4E.