Antares and Standard Nuclear Sign Multi-Year TRISO Fuel Supply Agreement

Antares Nuclear, Inc. of the United States recently announced that it has signed a binding multi-year fuel supply agreement with Standard Nuclear to secure advanced nuclear fuel supply for its compact microreactor program.

Under the agreement, Standard Nuclear will supply up to 8 metric tons of uranium (MTU) of tristructural isotropic particle fuel, or TRISO fuel, to Antares Nuclear by 2035. This fuel will be used in the microreactor currently being developed by Antares. Designed for demanding operating environments such as ground-based and space applications, this class of reactors aims to provide stable power for applications including national defense, aerospace, and off-grid critical infrastructure.

Jordan Bramble, Chief Executive Officer and co-founder of Antares Nuclear, stated that securing a long-term, industrial-scale supply of TRISO fuel is a critical foundation for advancing the company's microreactor from the demonstration phase to deployment. Kurt Terrani, Chief Executive Officer of Standard Nuclear, stated that the company is expanding its TRISO fuel production capacity to support advanced reactor customers in transitioning from demonstration projects to commercial deployment.

The two companies have been conducting collaborative research and development on fuel specifications, manufacturability, and production pathways since 2025. This supply agreement builds on that earlier collaboration and is also seen as part of the development of the U.S. advanced nuclear fuel supply chain.

Founded in 2023, Antares Nuclear primarily develops compact microreactors for national defense and aerospace applications. The company states that its Mark-0 microreactor achieved initial criticality in 2026, with plans to begin generating electricity using advanced reactors in 2027, and the first units are expected to be deployed to U.S. military installations in 2028. Standard Nuclear is headquartered in Oak Ridge, Tennessee, and focuses on the scaled production of advanced nuclear fuel and power systems.