Highlights

• Dr. James Widmer's 2026 white paper warns that the UK's EV transition faces a structural supply-chain threat due to heavy reliance on rare earth permanent magnet motors, with one nation controlling ~90% of global processing capacity—creating a single point of failure similar to the COVID-era semiconductor crisis.
• AEM's commercially deployed rare-earth-free motor technology (SSRD) claims performance parity with a 40% cost reduction and 55% lower lifecycle environmental impact, offering an alternative to permanent magnet motors that require up to 1 kg of rare earths per vehicle.
• The industry pivot away from rare-earth motors is likely incremental (2028-2035 window) rather than sudden, with a two-track future emerging: some OEMs diversifying magnet supply and recycling, while others expand magnet-free designs where tradeoffs favor resilience over power density.

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In The Rare Earth Contagion (opens in a new tab) (2026), Dr. James Widmer, (opens in a new tab) CEO and co-founder of Advanced Electric Machines (opens in a new tab) (AEM)—a company spun out of Newcastle University—argues that the UK’s electric vehicle transition faces a structural supply-chain threat due to heavy reliance on rare earth permanent magnet motors. The white paper draws parallels to the COVID-era semiconductor crisis, warning that concentrated rare earth processing capacity—particularly in heavy rare earths such as dysprosium and terbium—creates a single point of failure that could disrupt EV production and derail the UK’s Zero Emission Vehicle (ZEV) mandate. The authors assert that commercially deployed rare-earth-free motor technologies already exist and could reduce geopolitical, environmental, and economic risks if rapidly adopted.

Dr. James Widmer, CEO of Advanced ElectricMachines

Source: AEM

Study Approach and Analytical Framework

This report is a policy and risk assessment, not a peer-reviewed academic study. It synthesizes public data on global rare earth production and processing concentration, export restrictions enacted in 2025, and historical precedent (e.g., the 2010 Japan rare earth embargo). It models three disruption scenarios:

1. Trade escalation and export controls
2. Climate-driven production constraints in energy-intensive refining
3. Cyberattacks on geographically concentrated processing hubs

The paper also evaluates AEM’s Super Speed Reluctance Drive (SSRD) motor technology, which eliminates permanent magnets and relies on steel-based electromagnetic design. AEM reports more than 4 million kilometers of commercial deployment in buses and light rail applications.

Key Findings

• Processing concentration: One nation controls approximately 90% of global rare earth processing and nearly all heavy rare earth refining.
• Material intensity: Permanent magnet motors can require up to 1 kg of rare earths per vehicle.
• Environmental burden: Rare earth mining and refining generate significant waste streams and environmental damage.
• Alternative technology claims: AEM reports performance parity, roughly 40% cost reduction, and a 55% lower lifecycle environmental impact versus permanent magnet motors.

The report recommends immediate pilot programs, domestic manufacturing scale-up, and revisions to the UK Critical Minerals Strategy to prioritize substitution alongside diversification.

Implications

If rare earth supply disruptions intensify, EV production could slow, vehicle prices could rise, and manufacturers could face regulatory penalties under emissions mandates. AEM argues that eliminating rare earth dependency—rather than merely diversifying sources—offers a faster path to resilience and climatecompliance.

Limitations and Context

The white paper is authored by a company with a direct commercial interest in rare-earth-free motors. Several lifecycle and cost claims rely on proprietary analyses. The report gives limited attention to ongoing global efforts in rare earth recycling, supply diversification, and magnet innovation. Permanent magnet motors remain widely used due to their high torque density and mature supply ecosystem.

The Pivot

Pivoting away from rare-earth permanent-magnet motors is real—but it’s likely to be incremental over the next decade, not a suddenbreak. The argument for alternatives is getting louder: exportcontrols and licensing delays have turned supply concentration into an operational risk, and the IEA has warned that delays or denials in magnet licensing can threaten industrial value chains.

Carmakers already have viable “magnet-free” paths—electrically excited synchronous motors (Renault (opens in a new tab) has used them at scale for years) and other non-PM architectures—showing this isn’t science fiction. The argument against a fast pivot is equally hard: permanent-magnet synchronous motors remain dominant because they’re compact, efficient, and power-dense—advantages that are especially valuable as EVs compete on range, cost, and packaging.

In practice, the horizon looks like a two-track world: many OEMs will keep PM motors but diversify magnet supply and recycle, while a subset expands magnet-free designs where the tradeoffs make sense (certain platforms, duty cycles, or regulatory/strategic contexts).

A conservative REEx read: meaningful share shift is more likely in the 2028–2035 window—not because the physics suddenly changes, but because product cycles, supplier qualification, and manufacturing retooling are slow, and because cost pressures can still push OEMs back toward the cheapest scalable option (including sourcing components from China), as recent Reuters reporting on Renault’s supplier search illustrates.

Conclusion

The Rare Earth Contagion frames rare earth dependency as an avoidable systemic risk. Whether industry pivots toward substitution or doubles down on diversification will shape the resilience of the EV transition. The debate is no longer abstract: supply security is now central to decarbonization strategy.

Citation: Widmer, J., The Rare Earth Contagion, Advanced Electric Machines, 2026