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Short answer: The United States gets nuclear fuel from a chain that is still heavily international. Uranium is mined and milled into uranium concentrate (U3O8), converted to uranium hexafluoride (UF6), enriched, and then fabricated into fuel pellets and assemblies. In 2025, Canada, Kazakhstan and Australia were the largest reported origins of uranium delivered to U.S. reactor operators. The United States produced more uranium concentrate and supplied 23% of the enrichment work that U.S. operators bought, but foreign suppliers still provided most enrichment services. Federal contracts and demonstrations are intended to rebuild domestic capacity, yet announced projects and limited demonstrations are not the same as sustained commercial output.
What “where the U.S. gets nuclear fuel” actually means
A reactor’s fuel has several origins, and they do not have to be the same. A utility can buy uranium mined in one country, send the material to an enrichment plant in another, and contract fabrication of the finished fuel assemblies somewhere else. Ownership of uranium already in inventory can also differ from the country where new material was delivered.
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The fuel chain normally follows these stages:
- Mining and milling: Ore is extracted and processed into uranium concentrate, commonly called yellowcake or U3O8.
- Conversion: The concentrate is converted to uranium hexafluoride (UF6), the chemical form used in enrichment.
- Enrichment: The proportion of uranium-235 is increased. Enrichment services are measured in separative work units (SWU), a measure of the work needed to separate feed into enriched product and depleted tails at specified assays.
- Fuel fabrication: Enriched uranium is converted into ceramic pellets, loaded into fuel rods, and assembled into the fuel bundles used by a particular reactor design.
Consequently, a statistic about uranium delivery origin does not tell you where enrichment occurred, and a statistic about SWU does not tell you where the uranium was mined. Those measures answer different supply questions.
Which countries supplied uranium to U.S. reactors in 2025?
The U.S. Energy Information Administration’s 2025 delivery data identify the country of origin for uranium delivered to U.S. reactor operators. Canada was the largest source, followed by Kazakhstan and Australia.
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| Delivery origin | Share of uranium delivered to U.S. reactor operators in 2025 |
|---|---|
| Canada | 32% |
| Kazakhstan | 28% |
| Australia | 15% |
| United States | 7% |
| Uzbekistan | 7% |
| Namibia | 4% |
These percentages describe deliveries in 2025, not the location of every step that turned the material into reactor fuel. They also should not be read as a complete ranking of mining companies or as a measure of how much enrichment each country performed. The EIA’s Uranium Marketing Annual Report is the source for the delivery-origin breakdown.
How dependent is the United States on imported uranium?
For the most direct measure of concentrate use, EIA reported that U.S. nuclear generators used 32 million pounds of imported U3O8 concentrate in 2023 and 0.05 million pounds of domestic concentrate. Imports therefore represented 99% of the concentrate used that year. This is a consumption measure for 2023; it is not interchangeable with the 2025 delivery percentages above.
Domestic mine and mill output did increase sharply. U.S. uranium production facilities produced about 2.1 million pounds of U3O8 concentrate in 2025, up from 657,000 pounds in 2024, according to the EIA’s Domestic Uranium Production Report. Higher production improves the first stage of the chain, but it does not by itself provide conversion, enrichment, fuel fabrication or the transportation and quality systems needed to load fuel into a reactor.
The EIA’s 2023 import calculation appears in “U.S. nuclear generators import nearly all the uranium concentrate they use.” Because the reporting years and definitions differ, neither figure should be presented as a single current “import dependence” percentage for the entire fuel cycle.
Where does U.S. enrichment come from?
Enrichment is a separate dependence from uranium mining. In 2025, reactor operators delivered 37% of their natural-uranium feed to U.S. enrichment suppliers and 63% to foreign suppliers. When EIA measured the enrichment services actually purchased, U.S.-origin services accounted for 23% of 13 million SWU.
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| Origin of enrichment services purchased in 2025 | Share of 13 million SWU |
|---|---|
| United States | 23% |
| Russia | 26% |
| France | 18% |
| United Kingdom | 14% |
| Netherlands | 8% |
The named foreign shares total 66%, while the EIA’s table also includes other origins. The key point is that U.S. operators purchased substantially more enrichment work from foreign-origin suppliers than from U.S.-origin suppliers in 2025. The figures come from the EIA’s Uranium Marketing Annual Report.
“U.S.-origin enrichment” refers to where the enrichment service was performed, not necessarily where the feed uranium was mined. A utility may therefore combine Canadian-origin uranium with enrichment services performed in the United States, or pair another mining origin with a foreign enrichment contract.
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Delivery, fuel loading and inventory figures describe different points in the cycle. For 2025, U.S. reactor operators bought 46.9 million pounds of U3O8-equivalent (U3O8e) for delivery. Commercial inventories held by the industry totaled 170 million pounds U3O8e at year-end, while fuel loaded during the year contained 40.9 million pounds U3O8e.
| Measure | 2025 amount | What it indicates |
|---|---|---|
| Uranium bought for delivery | 46.9 million pounds U3O8e | Contracted or purchased material scheduled for delivery |
| Commercial inventory at year-end | 170 million pounds U3O8e | Material held in the commercial system |
| Uranium contained in fuel loaded | 40.9 million pounds U3O8e | Material represented in fuel loaded into reactors during the year |
These amounts are not direct substitutes for one another. Inventory can include material purchased in earlier years, and the uranium equivalent in loaded fuel reflects processing and enrichment relationships rather than a same-year mine-to-reactor flow.
What happened to Russian nuclear-fuel imports?
The U.S. law restricting Russian nuclear fuel took effect on August 11, 2024. The Nuclear Regulatory Commission describes the restriction as covering imports of unirradiated low-enriched uranium (LEU) and natural uranium produced in Russia or by a Russian entity, subject to waivers issued by the Department of Energy. The NRC’s explanation is available in its Backgrounder on Uranium Import Ban.
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The waiver mechanism is temporary and limited. Through 2027, DOE may authorize an import when, for example, no viable alternative is available to keep a reactor or company operating, or when the import is in the national interest. That provision does not make Russian supply a normal long-term option; it is a bridge for specified cases.
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DOE’s current domestic LEU program page describes the broader prohibition as running through December 31, 2040 and warns of a potential supply gap if replacement capacity is not built. The same page explains the program and contracting approach at Domestic Low Enriched Uranium Supply Chain. The practical result is a race to replace Russian enrichment and fuel inputs while preserving enough supply for reactors that cannot immediately switch suppliers.
What is the federal government doing to expand domestic LEU?
DOE reports a $2.72 billion fiscal-year 2024 appropriation to establish or expand enrichment and conversion services. The program uses task-order contracts rather than treating an award as proof that a complete commercial plant is already operating.
In 2024, six companies were selected to prepare proposals and compete for later work:
- American Centrifuge Operating
- General Matter
- Global Laser Enrichment
- Louisiana Energy Services
- Laser Isotope Separation Technologies
- Orano Federal Services
DOE says all six may bid on subsequent task orders, subject to appropriations. On January 5, 2026, DOE finalized a $900 million Orano Federal Services task order for LEU capacity expansion over the next ten years. That award is a capacity-building commitment; it does not establish the final output, commissioning date or commercial operating rate of every planned facility.
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When evaluating any domestic-capacity announcement, check five details:
- Stage: Is it mining, conversion, enrichment, deconversion or fuel fabrication?
- Status: Is there operating production, a demonstration, a signed award or only a planned project?
- Material: Does it produce ordinary LEU for today’s fleet or HALEU for advanced designs?
- Measure: Is the volume stated as uranium feed, SWU, kilograms of enriched material or finished assemblies?
- Timing: What date and sustained production rate are actually committed?
Why HALEU matters for advanced reactors
Most of the existing U.S. fleet uses fuel enriched to no more than 5% uranium-235. DOE defines high-assay low-enriched uranium (HALEU) as uranium enriched from 5% to below 20% uranium-235. Many advanced reactor designs require HALEU because the higher assay can support smaller cores, longer operating periods or other design objectives.
DOE estimates that U.S. HALEU demand could reach 50 metric tons per year by 2035. That is a DOE demand estimate, not a guaranteed order book. DOE and national laboratories are also studying recovery and downblending of material from government research reactors as another potential source.
The Piketon demonstration
A DOE-supported demonstration in Piketon, Ohio, uses 16 advanced centrifuges. DOE reports that more than 100 kilograms of HALEU had been enriched and anticipates ramping to 900 kilograms for near-term fuel-qualification tests and demonstrations. The figures show that U.S. enrichment of HALEU is technically progressing, but the quantities are limited relative to a potential 50-metric-ton annual market.
The distinction matters: a demonstration can prove equipment, procedures and material quality without supplying enough fuel for a commercial reactor fleet. Commercial-scale HALEU production will require additional enrichment capacity, conversion and deconversion capability, licensed handling, qualified fuel fabrication and customers able to take regular deliveries. DOE’s HALEU definition and program information are at What is High-Assay Low-Enriched Uranium (HALEU)?.
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How new domestic capacity could affect supply
It could reduce exposure to a single foreign supplier
Replacing part of the foreign-origin SWU currently purchased by U.S. operators would give utilities another contracting option, particularly as Russian imports are restricted. More domestic capacity could also shorten some logistics routes and make emergency replenishment easier. The benefit depends on actual operating output, not on the announced nameplate capacity of projects that have not yet reached production.
Mining alone will not remove the main bottleneck
The jump to 2.1 million pounds of U.S. concentrate production in 2025 addresses the front end of the chain. A reactor still needs conversion to UF6, enrichment, reconversion to uranium dioxide, pellet production, rod manufacturing and assembly fabrication. If one of those links remains constrained, additional yellowcake cannot by itself produce more loaded fuel.
LEU and HALEU solve different problems
Ordinary LEU supports the current reactor fleet, while HALEU is intended for many advanced designs. A project that increases LEU SWU is not automatically a source of HALEU, and kilograms of HALEU cannot be compared directly with pounds of U3O8 concentrate. Each material belongs to a different stage and has different licensing, equipment and fabrication requirements.
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The Russian restriction creates a long-term incentive to build replacement capacity, while the waiver mechanism provides only limited flexibility through 2027. DOE’s contracts and the Piketon demonstration can support a staged build-out, but the available figures do not establish when the full set of mining, conversion, enrichment and HALEU projects will deliver sustained commercial volumes. Utilities may therefore continue using inventories and multiyear contracts while new plants are constructed and qualified.
How to read future claims about a “domestic nuclear-fuel supply”
A credible claim should identify the material, location and status. Ask whether “domestic” refers to the mine, the enrichment plant, the fuel fabricator or the ownership of inventory. Then check whether the stated quantity is annual production, a one-time demonstration, a contract ceiling or a government estimate.
- For uranium, look for pounds of U3O8 concentrate and the reporting year.
- For enrichment, look for SWU and the origin of the service.
- For HALEU, look for kilograms or metric tons, assay range and whether the material is qualified for a reactor.
- For projects, distinguish an operating facility from a selected bidder, a signed task order, construction activity or a demonstration campaign.
- For supply security, examine conversion and fuel fabrication as well as mining and enrichment.
On the evidence available for 2025 and early 2026, the United States is increasing domestic production and funding new enrichment capability, but it has not yet become self-sufficient across the nuclear-fuel chain. The country’s reactors still rely on a mix of domestic and foreign uranium, foreign enrichment services and inventories accumulated over time.
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