Antares Signs TRISO Fuel Agreement with BWXT, Securing Fabrication Through the End of the Decade

The initial uranium allocation can increase as Antares’ reactor deployment schedule requires.

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TORRANCE, Calif.--(BUSINESS WIRE)-- Antares has signed a commercial agreement with BWX Technologies, Inc. (NYSE: BWXT) to procure TRISO fuel fabricated from High-Assay Low-Enriched Uranium (HALEU) for its microreactors through the end of the decade. The fuel will be produced at BWXT's facility in Lynchburg, Virginia, on the same fabrication line that made the fuel for the Department of War's Project Pele and for Antares' Mark-0 and Mark-1 reactors.

The agreement sets terms for an initial allocation of one metric ton of uranium (1 MTU), with the ability to increase as Antares' deployment schedule requires. Antares now has two qualified sources for the fuel for reactor deployments. It is the company's second TRISO fuel fabrication agreement, following its agreement with Standard Nuclear.

“We achieved criticality with BWXT fuel, and it's what will power our electricity-producing reactor, Mark-1, in 2027,” said Jordan Bramble, CEO and Co-Founder of Antares. “Securing that same line through the end of the decade means our first production deployments run on fuel from a team and a process we've already proven.”

“BWXT’s decades of experience in advanced fuel manufacturing give us the foundation to support Antares as they accelerate toward commercial deployment,” said Joe Miller, president, BWXT Government Operations. “Our team has refined the processes, tooling and quality systems needed for high-performance TRISO fuel, and this agreement enables us to apply those strengths in a sustained, predictable way. As demand grows across the advanced reactor sector, BWXT is prepared to scale responsibly and reliably.”

TRISO fuel encases each uranium kernel in layers of carbon and ceramic that contain fission products at very high temperatures, which is what allows microreactors like Antares' to be compact, transportable, and inherently safe.

Antares is executing supply agreements at all stages of the fuel lifecycle to secure capacity for upcoming reactor deployments through the end of the decade and beyond. These agreements demonstrate Antares has built one of the most diversified fuel supply chains in the advanced nuclear industry.

About Antares

Antares is a nuclear fission energy company developing compact microreactors for defense and space applications, delivering safe, reliable power where traditional energy sources cannot. Founded in 2023 and backed by over $600 million in funding, Antares achieved initial criticality of its Mark-0 microreactor in 2026 under the DOE Reactor Pilot Program and is on track to produce electricity from an advanced reactor in 2027, with initial production deployments to U.S. military installations beginning in 2028. Antares operates facilities in Torrance, California; Washington, D.C.; Idaho Falls, Idaho; and Aiken, South Carolina.

About BWXT

At BWX Technologies, Inc. (NYSE: BWXT), we are People Strong, Innovation Driven. A U.S.-based company with more than 11,000 employees, BWXT is a Fortune 1000 and Defense News Top 100 manufacturing and engineering innovator that provides safe and effective nuclear solutions for global security, clean energy, nuclear medicine, space exploration and environmental restoration. BWXT owns and operates 19 manufacturing facilities globally, and its 14 strategic partnerships support the U.S. and Canadian governments at more than two dozen additional locations.

View source version on businesswire.com: https://www.businesswire.com/news/home/20261027445858/en/

Antares Media
Kayla Haas
kayla.haas@antaresindustries.com

Source: Antares

Key Terms

triso technical

Triso is a type of nuclear fuel made of tiny kernels of fissile material encased in multiple microscopic layers of ceramic and carbon, creating a miniature, tough containment system for radioactive material. For investors, triso matters because it enables reactors to run hotter and more efficiently with lower risk of fuel failure—think of it as an armored seed that helps new reactor designs be safer and more commercially attractive, affecting technology adoption, regulatory approval, and company valuations.

haleu technical

HALEU (high-assay low-enriched uranium) is uranium fuel enriched to a higher level than traditional reactor fuel but below weapons-grade, roughly like a higher-octane gasoline for nuclear reactors. It matters to investors because this fuel enables newer, smaller and more efficient reactors to run longer or produce more power from less material, so availability, regulation and production costs can affect utilities, reactor developers and mining companies’ prospects.