Every story you have read in the last two years about America’s nuclear renaissance — TerraPower’s Natrium at Kemmerer, X-energy at Dow Seadrift, Kairos Hermes at Oak Ridge, Westinghouse eVinci, BWXT’s microreactor factory, NuScale, Oklo, the DoD’s Pele microreactor — every one of those stories runs on a fuel the United States almost does not make.
The fuel is called HALEU. High-Assay Low-Enriched Uranium. It is uranium enriched between 5% and 20% in the U-235 isotope — above the 3% to 5% range that runs every commercial reactor built in the last 60 years, below the 20%+ threshold that triggers a weapons-grade designation under the IAEA framework.
It is the single technical lever that lets the next generation of reactors be smaller, hotter, longer-cycle, and walk-away-safe. It is also a fuel for which, until early 2024, the only meaningful global producer was Russia.
This is the bottleneck. And it is also the opportunity.
Why HALEU is not just \”more enriched\” uranium
The shift from 5% LEU to 19.75% HALEU sounds incremental on paper. In practice it is a structural redesign of the fuel cycle.
Higher enrichment means more fissile material per kilogram. That lets a reactor designer either shrink the core (microreactors, mobile reactors, naval reactors), extend the refueling interval (the X-energy Xe-100 targets a 3-year fuel cycle versus the standard 18-to-24-month PWR cycle), or run hotter and burn more efficiently (high-temperature gas reactors, molten salt reactors).
That is exactly the design space the entire DOE Advanced Reactor Demonstration Program operates in. Of the 13 advanced reactor designs receiving meaningful federal cost-share through ARDP and its follow-on programs, 11 require HALEU at varying scale. The two exceptions — light-water SMRs like NuScale’s VOYGR and GE-Hitachi’s BWRX-300 — are built around standard 5% LEU specifically to dodge the fuel-supply problem.
The 11 that need HALEU are committed to it because the design margin is genuinely better. The fuel-supply problem is the cost of admission, not a defect.
The arithmetic of the gap
DOE Office of Nuclear Energy modeling from late 2024, refreshed under the FY26 budget reconciliation, puts U.S. HALEU demand at approximately 40 metric tons per year by 2030 if the announced advanced reactor pipeline lands roughly on schedule. The number stretches toward 100 metric tons per year by 2035 if the second wave (commercial follow-on units after the FOAK demonstrations) also lands.
U.S. domestic HALEU production capacity in May 2026: roughly 900 kilograms per year, all of it from a single Centrus Energy cascade at the American Centrifuge Plant in Piketon, Ohio.
That is not a typo. The U.S. produces less than 1 metric ton of HALEU per year. We need 40.
The fix has two parallel paths. Centrus is scaling its Piketon cascade toward roughly 6 metric tons per year by 2028, and toward a \”design-basis\” 20 metric tons per year by 2030 if the second-and-third cascade hall expansions land. Orano signed a Department of Energy contract late last year for a U.S.-domiciled HALEU production line co-located with its existing Eagle Rock site planning footprint in Idaho. X-energy’s TX-1 Cascade project, a downblending pathway that converts existing Department of Energy high-enriched uranium inventories to HALEU, has been running pilot output since 2024.
Add it up and the realistic U.S. HALEU capacity by 2030 is somewhere between 12 and 18 metric tons per year against a 40 metric ton per year demand profile.
That is the gap. It is not closing on its own.
What just changed in policy
Two policy moves over the last 12 months reshape the math.
First, the Prohibiting Russian Uranium Imports Act took full effect on January 1, 2026. The law has been on the books since May 2024, but the waiver window for utility-side contracts closed at the start of this year. There is no longer a legal pathway for U.S. reactor operators to source HALEU from Tenex or any other Rosatom subsidiary. The supply route that quietly serviced the early Pele and TRISO-X qualification campaigns is closed.
Second, OBBBA — the FY26 omnibus reconciliation package that became law in late 2025 — authorized $3.4 billion of additional DOE funding specifically for HALEU production, beyond the $2.7 billion appropriated through the Inflation Reduction Act and the Energy Act of 2020 combined. That money is now flowing through the DOE HALEU Availability Program, which functions as an offtake-and-pre-payment instrument for domestic enrichment expansion.
The Centrus and Orano awards announced in March 2026 cumulatively obligated about $2.1 billion of that pot. There is room in the appropriation for a third major award. There is not yet a clear third major awardee.
This is the missing slot in the American fuel cycle.
The dual-use layer most analysts miss
Civilian advanced reactor demand is the headline number, but the strategic case for HALEU sits on top of three additional demand stacks that civilian energy analysts routinely under-count.
Naval Reactors. The U.S. Navy’s nuclear propulsion program has historically run on highly enriched uranium — HEU, above 90% — which is a separate fuel cycle. Naval Reactors has been quietly evaluating a HALEU transition pathway for the next-generation submarine and aircraft carrier reactor designs because the HEU supply chain is itself constrained and because a HALEU-fueled naval design would unlock proliferation-resistant export options to allied navies. Naval HALEU demand is classified but informed industry estimates put it in the range of 8 to 12 metric tons per year at full transition.
DoD microreactors. The Pele program, with BWXT as prime, is contracted to deliver a transportable 1 to 5 megawatt-electric microreactor to a DoD site. Pele uses HALEU TRISO fuel. The follow-on production-rate vision for forward-operating-base power is a fleet measured in dozens of units, each consuming low single-digit metric tons of HALEU over its operating life.
Research reactors and isotope production. Medical isotope production (Mo-99, the precursor to Tc-99m), university research reactors, and the High Flux Isotope Reactor at Oak Ridge are all migrating to HALEU under the Reduced Enrichment for Research and Test Reactors program. Cumulative demand is modest by reactor-fleet standards — roughly 1 to 2 metric tons per year — but the strategic weight is outsized because the medical isotope supply chain is currently a single-point-of-failure on a 1960s-vintage Canadian reactor.
Stack civilian advanced reactor demand on top of Naval Reactors, on top of DoD Pele, on top of research and isotope production, and the realistic HALEU demand envelope by 2035 is closer to 130 metric tons per year than the headline 100. The gap, in other words, is larger than the public discussion implies.
What this means for Porritt Inc. and for our readers
We do not enrich uranium. We design refineries. So why does Porritt Inc. write about HALEU?
Two reasons.
First, the same federal-policy architecture that is now closing the HALEU gap is the architecture that funds modular and distributable energy infrastructure broadly. The DOE Loan Programs Office Energy Dominance Financing window, the Genesis Mission AI-and-energy-security framework, OBBBA §45V hydrogen, OBBBA §45Q carbon capture parity, and the HALEU Availability Program are all instruments inside the same policy stack. An operator, developer, or investor who understands one of them is meaningfully closer to understanding the others. We write about that policy stack because it is where the money is.
Second, the design pattern that wins the HALEU buildout — small, modular, factory-fabricated, regulator-engaged early, defensible IP, dual-use customer base — is the same design pattern that wins distillate-first micro-refining. The lessons compound across the energy security portfolio. Centrus’s path from a single Piketon cascade to a 20 metric ton per year facility is the same pattern as a 10,000 BPD modular refinery scaling to a fleet of units. Same federal counter-parties. Same project finance challenges. Same regulatory choreography. Different molecule.
The watchlist
Three companies determine whether the HALEU buildout lands on the 2030 schedule. Centrus Energy (LEU on NYSE American) is the only U.S. firm currently producing licensed HALEU at commercial scale. Watch their cascade expansion permits at Piketon and the DOE Phase 3 award timing. Orano USA, privately held, is the second public-pathway producer with a U.S. HALEU footprint awarded in March. X-energy’s TX-1 Cascade is the third, with the unique downblending-pathway approach that gives the Department of Energy direct optionality over existing HEU inventory.
There is room in the policy stack for a fourth player. There is not yet a fourth player.
The takeaway
The HALEU bottleneck is not a niche supply chain story. It is the load-bearing constraint underneath America’s entire next-generation reactor program, the silent prerequisite of the DoD’s distributed-power vision, and the single largest unaddressed component of the FY26 energy-security appropriation. Washington has put roughly $6 billion behind closing the gap. The companies building into that gap will define the next decade of nuclear in the United States.
If you are an investor, operator, or program manager building inside this policy stack — whether on the fuel side, on the reactor side, or on the dual-use defense customer side — and you want a partner who reads the federal energy-financing architecture the same week the Program Guidance refreshes, Porritt Inc. is open for consultation engagements. Contact through porrittinc.com.
The bottleneck is also the opportunity. Most of them are.
— Timothy Porritt, Founder & CEO, Porritt Inc.