The SWU Squeeze: Enrichment Is the Real Uranium Trade

1The fuel cycle in one paragraph

Reactor fuel is not ore. Mined uranium is converted to gas, enriched from 0.7% U-235 to 3-5% for conventional reactors, then fabricated into assemblies. Each step is a separate market with separate capacity, and the middle two - conversion and enrichment, priced in separative work units, SWU - are the thinnest. Owning miners while ignoring SWU is owning wheat and ignoring the flour mills.

Western enrichment is essentially two companies: Urenco (a UK-German-Dutch consortium, private) and France's Orano. Russia's Rosatom-TENEX historically held roughly 40% of world capacity and supplied about a fifth of US reactor fuel.

2The ban with a fuse

The US banned Russian enriched uranium imports in May 2024, with waivers allowed through 2027 to keep reactors fuelled while Western capacity builds. That sunset is the clock the whole trade runs on: utilities have been signing long-term Western SWU contracts at prices far above the pre-2022 norm, and SWU spot indicators roughly tripled from their lows (trade-press assessments; the market is opaque and we flag the precision below).

Urenco and Orano have announced expansions at Eunice, New Mexico and in France. Expansion in this industry means cascades of centrifuges spinning years from now - supply answers on enrichment's schedule, not the market's.

3Centrus, and the HALEU problem

Centrus Energy (LEU) is the only US-owned enricher with operating centrifuges - a small HALEU demonstration cascade in Piketon, Ohio, under Department of Energy contracts, with ambitions to scale. HALEU - uranium enriched to 5-20% - is the fuel most small modular reactor designs assume, and outside Russia it is made in kilogram quantities against designs that need tonnes.

That is the circular dependency under the SMR trade: developers like Oklo (OKLO) and NuScale (SMR) need a fuel that scales only if their reactors do, financed by customers who want the fuel supply proven first. DOE contracts exist precisely to break that circle; their pace is the single best indicator for the whole layer. BWXT sits adjacent with naval and TRISO fuel fabrication.

4What would falsify the squeeze

Three things: waiver extensions past 2027 (politics can always add time), faster-than-announced Urenco/Orano cascade additions, or SMR programmes slipping badly enough that HALEU demand stays theoretical. Watch utility fuel-contract disclosures, DOE HALEU awards, and the quarterly SWU price assessments. The ore price is the headline; the SWU term price is the tell.

Sources and method

Compiled from public filings, government and agency data and trade press, cross-checked against our desks where they overlap. Supply shares and lead times in private industrial chains are estimates, are labelled as estimates, and the ones we could not verify this week are under what we do not know rather than asserted. The lines below are the factual spine.

• Russia held roughly 40% of world enrichment capacity pre-ban (WNA)
• US law bans Russian EUP with waivers through 2027 (P.L. 118-62)
• Centrus operates the only US-owned enrichment cascade, producing HALEU at demonstration scale under DOE contract (company/DOE disclosures)

Underlying sources

• Public Law 118-62 (Russian uranium import prohibition, 2024) and DOE waiver framework
• World Nuclear Association - enrichment capacity by country
• Centrus, Urenco, Orano disclosures and expansion announcements
• DOE HALEU availability programme documents

Written by Parallax Research's research writer on 2026-07-29 and reviewed against the dossier it was given. Figures are as of that date and are not updated in place. Our scoring model's out-of-sample AUC is published in the whitepaper; nothing here is a forecast.