X-energy Secures Long-Term HALEU Supply for Xe-100: Why SMR Fuel Security Matters for Africa

Advanced nuclear developers often promote small modular reactors around size, modular construction and the possibility of faster deployment. But a reactor cannot operate without a dependable supply of qualified fuel, and a new agreement between X-energy and Centrus Energy illustrates why fuel availability is becoming one of the most important constraints facing advanced nuclear deployment.

X-energy and Centrus have signed a definitive long-term agreement under which Centrus will provide uranium-enrichment services for low-enriched uranium and high-assay low-enriched uranium, or HALEU, required for X-energy’s Xe-100 high-temperature gas-cooled reactor programme. The agreement includes phased prepayments from X-energy designed to help support Centrus’s expansion of commercial enrichment capacity.

Unlike a memorandum of understanding, the agreement represents a substantive commercial commitment between an advanced-reactor developer and an upstream nuclear-fuel supplier.

For African countries considering SMRs, that distinction matters.

The Reactor Is Only One Part of the Project

X-energy’s Xe-100 is designed as an 80 MWe high-temperature gas-cooled reactor using TRISO fuel. Multiple modules can be combined to create larger generating stations, while the reactor’s high-temperature output also creates potential applications in industrial heat.

But the Xe-100 does not use the same fuel configuration as conventional large light-water reactors.

Its TRISO fuel depends on HALEU, uranium enriched above the levels normally used in today’s commercial reactor fleet.

That means successful deployment depends on several linked stages:

uranium mining, conversion, enrichment, fuel fabrication, transport, safeguards, physical protection, reactor operation and eventual spent-fuel management.

If any one of those stages is unavailable, reactor deployment can be delayed regardless of how mature the reactor design itself may be.

HALEU Has Become a Strategic Constraint

Many proposed advanced reactors require HALEU because its higher enrichment can allow longer operating cycles, smaller reactor cores or different reactor physics than conventional low-enriched uranium fuel.

However, commercial HALEU production capacity in Western markets remains limited.

That has created a potential mismatch between the large number of advanced reactors announced for future deployment and the relatively small amount of specialised fuel currently available to support them.

The X-energy–Centrus agreement is therefore important because it begins linking expected reactor demand with fuel-production investment.

Centrus plans to produce enriched material at its American Centrifuge Plant in Ohio. The fuel will then move into X-energy’s TRISO-X fabrication chain in Tennessee.

The emerging chain is therefore:

enrichment → HALEU → TRISO fabrication → Xe-100 fuel → reactor deployment.

For African newcomer countries, this provides a useful example of what a complete advanced-reactor supply chain actually looks like.

Africa Must Ask the Fuel Question Earlier

African discussions about SMRs commonly focus on capital cost, reactor size, grid compatibility and construction schedules.

Fuel security deserves equal attention.

Before selecting an advanced reactor, governments should establish:

who produces its fuel; how many qualified suppliers exist; whether production is operating commercially; how long-term refuelling will be guaranteed; what export controls apply; whether transport routes are established; how safeguards will be implemented; and what arrangements exist for spent fuel.

The answers may materially change the attractiveness of competing reactor technologies.

A design using widely available conventional fuel may offer different supply-security characteristics from a design dependent on a specialised fuel manufactured by only a small number of suppliers.

An African Uranium Paradox

There is another important African dimension.

Africa is already an important producer of mined uranium. Namibia is one of the world’s major suppliers, while Niger and South Africa have longstanding uranium sectors and several other countries possess prospective resources.

Yet most of the higher-value stages of the commercial fuel cycle—including conversion, enrichment and advanced fuel fabrication—remain outside Africa.

As global nuclear demand increases, African governments may therefore need to decide whether their nuclear-industrial strategy should remain concentrated on uranium extraction or gradually pursue commercially realistic opportunities farther along the fuel value chain.

That does not mean every African uranium producer should build enrichment plants. Enrichment is capital-intensive, highly regulated and closely connected to international non-proliferation obligations.

But the broader question of how Africa captures more value from a growing nuclear economy deserves serious policy attention.

What This Means for Africa

The X-energy–Centrus agreement demonstrates that advanced nuclear deployment depends on much more than reactor technology.

For African countries evaluating SMRs, fuel-cycle readiness should be assessed alongside financing, safety, licensing and localisation.

An advanced reactor that cannot obtain qualified fuel on commercially dependable terms is not truly deployment-ready.

The central procurement lesson is simple: before buying an SMR, understand who will fuel it for the next sixty years.