The shortage of high-assay low-enriched uranium (HALEU) remains a critical constraint on the deployment of small modular reactors (SMRs), because current production plans fall short of the volumes that a large advanced reactor fleet would require, according to a new global uranium enrichment market outlook covering 2026–2031.

Demand Is Real and Growing

The transition toward low-enriched uranium plus (LEU+) and HALEU is creating a new source of demand across the nuclear fuel cycle. LEU+ is being evaluated for longer reactor operating cycles, while HALEU — enriched between 5% and 20% in uranium-235, versus below 5% for today's operating plants — is required by many SMR and microreactor designs.

That demand is already being contracted. Quantum Leap Energy has agreed to sell the entire future output of its planned South African HALEU facility to TerraPower, and Centrus Energy has signed multi-year supply deals with Antares and with Radiant for its Kaleidos microreactors, alongside a combined LEU and HALEU agreement with X-energy.

The HALEU shortage remains a critical constraint on SMR deployment because current production plans are below the volumes that a large advanced reactor fleet would require.

The Supply Side Is Playing Catch-Up

Western suppliers face a combined challenge: replacing roughly 27 million separative work units (SWU) of restricted Russian capacity while simultaneously developing commercial-scale advanced fuel supply chains. The report notes that AI data centre demand is adding further pressure on enrichment capacity and pricing.

What to Watch

Three signals will determine whether the constraint eases: first, whether prepayment-backed offtakes convert into physical capacity at Piketon and Pelindaba; second, whether LEU+ demand competes with HALEU for the same enrichment machines; and third, whether new entrants can license and finance facilities quickly enough to matter before the first SMR fleets need fuel.

For reactor developers, the message is that fuel supply — not reactor design — may set the pace of deployment over the next five years.

This article was assisted by AI analysis. Please refer to the original source for official information.