Fuel is emerging as the defining constraint for the microreactor industry. While engineering breakthroughs and design competition between Westinghouse’s eVinci, Nano Nuclear’s KRONOS MMR, Oklo’s Aurora, and X-energy’s Xe-Mobile dominate headlines, the real bottleneck lies in the supply of nuclear fuel. Without steady, affordable access to TRISO and HALEU, microreactors cannot scale beyond one-off demonstrations. The economics, timelines, and geopolitical positioning of the entire sector now depend on which countries and companies can solve the fuel supply problem first.
Why TRISO fuel is considered the safest bet for microreactors but still faces supply and cost bottlenecks in 2025
TRISO, or tri-structural isotropic fuel, is composed of uranium kernels coated with multiple layers of ceramic and carbon. This unique structure ensures that radioactive material remains contained even under extreme heat, making TRISO one of the safest and most robust fuel forms available. It is the backbone of many high-temperature gas-cooled and heat-pipe microreactor designs.
The problem is scale. Production capacity is still measured in kilograms when demand will soon require metric tons annually. X-energy’s TRISO-X facility in Oak Ridge, Tennessee, is slated to become the first large-scale commercial plant in North America by 2027 or 2028, but it is not yet operational. Standard Nuclear and BWXT Technologies are also expanding fabrication capacity, with BWXT experimenting with new kernel materials that could improve performance. Despite these efforts, the industry risks falling short of near-term demand, and costs remain elevated because every TRISO batch requires meticulous qualification and licensing.
How HALEU shortages and enrichment delays threaten fast-spectrum microreactor designs like Oklo’s Aurora
HALEU, or high-assay low-enriched uranium, enriched between 5 and 20 percent U-235, is critical for fast-spectrum reactor designs. It enables smaller, more powerful cores and higher efficiency, but it is in even shorter supply than TRISO. Current domestic output is only a few hundred kilograms a year, largely from Centrus Energy, while projected demand in the U.S. could hit 40 to 50 metric tons annually by the early 2030s.
Oklo’s Aurora relies on HALEU, and without secure supply chains its deployment is at risk of indefinite delay. Geopolitical challenges complicate matters further. Russia has historically dominated global HALEU enrichment capacity, but sanctions and energy security concerns mean U.S. and European developers cannot depend on Russian sources. Efforts are underway to expand enrichment domestically and explore alternatives like atomic vapor laser isotope separation, but meaningful volumes are years away. For HALEU-based designs, fuel—not engineering—remains the primary roadblock.
Which companies are leading the race to expand TRISO and HALEU production capacity in the United States by 2030
Several companies are positioning themselves to close the gap. X-energy is investing billions in its Oak Ridge facility, expected to produce several metric tons of TRISO fuel annually once fully ramped. Standard Nuclear has been selected under Department of Energy programs to advance commercial TRISO fuel lines in Tennessee and Idaho. BWXT Technologies continues to expand its advanced nuclear manufacturing capabilities, including specialized furnaces to improve TRISO throughput.
On the HALEU side, Centrus Energy remains the only commercial producer in the United States, though at a limited scale. The Department of Energy is subsidizing enrichment programs to diversify suppliers and stockpiling fuel to support initial microreactor deployments. Nano Nuclear Energy, which acquired Ultra Safe Nuclear’s assets in early 2025, has also announced ambitions to expand TRISO production as part of its portfolio. These players will determine whether fuel availability matches the ambitions of microreactor developers before 2030.
Why Russia and China still dominate enrichment capacity and how this shapes global nuclear fuel geopolitics
Russia and China have distinct advantages in fuel supply. Russia maintains vertically integrated enrichment capacity, supporting both TRISO and HALEU-equivalent fuels through its state-owned Rosatom. Its floating reactors in the Arctic and planned land-based microreactors are backed by assured state-controlled fuel cycles.
China, meanwhile, is scaling both its enrichment and its broader nuclear buildout at unprecedented speed. With its Linglong-1 SMR nearing completion and a pipeline of nuclear projects tied to the Belt and Road Initiative, Beijing is embedding nuclear fuel supply into its global infrastructure diplomacy. Western nations, by contrast, are racing to catch up, but fragmented supply chains and regulatory hurdles keep costs high. This divergence is creating a geopolitical split in which fuel access itself becomes a tool of influence.
How government subsidies, DOE programs, and defense contracts are shaping the economics of TRISO and HALEU
Without state intervention, neither TRISO nor HALEU production would be cost competitive in 2025. Government subsidies are the bridge. The U.S. Department of Energy funds both pilot enrichment programs for HALEU and fabrication lines for TRISO. The Advanced Reactor Demonstration Program provides cost-sharing for reactor developers while also assuring fuel availability for their projects.
Defense procurement is another anchor. The Department of Defense’s interest in microreactors for forward-deployed bases under Project Pele has spurred commitments to stockpile advanced fuels. By guaranteeing early demand, these contracts make private investment in fuel facilities more bankable. Canada’s staged licensing approach also helps developers by allowing them to pursue site preparation in parallel with design finalization, reducing uncertainty around fuel delivery schedules. Ultimately, public funding is keeping the supply chain alive long enough for commercial volumes to emerge.
What investors and developers should watch in the next five years as fuel supply chains decide microreactor winners
The decisive question for investors and developers is not which microreactor design is most elegant but which one has the most reliable fuel supply. TRISO-based designs may achieve earlier commercial success because production facilities are already under construction, even if still small. HALEU-based designs face steeper challenges, as enrichment and political bottlenecks remain unresolved.
Between now and 2030, watch for milestones such as the commissioning of X-energy’s Oak Ridge facility, the scaling of Centrus Energy’s HALEU production lines, and the ability of the Department of Energy to secure long-term contracts for enriched fuel. Also critical will be whether Russia and China extend their influence in export markets by coupling reactor sales with bundled fuel guarantees. The next five years will decide whether microreactors remain niche experiments or become mainstream clean energy solutions, and the answer lies in fuel, not engineering.
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