US nuclear fission company Antares has signed a long-term enrichment services agreement with Urenco to supply high-assay low-enriched uranium (Haleu) for its factory-produced microreactors.

The company said the deal secures one of the most “constrained inputs” for advanced reactor commercialisation and reinforces a reliable Western fuel supply chain for next-generation nuclear energy.

Under the agreement, Urenco will provide enrichment services for Haleu to support Antares’ planned microreactor deployments in North America and allied markets. The fuel will be produced at Urenco’s Haleu enrichment facility in the UK, which is on schedule to be one of the first Western licensed facilities.