Reducing Dysprosium: The Hidden Lever Reshaping Cost, Risk, and Sustainability in Clean Energy

Highlights

• Reducing dysprosium content from 4% to 1% in Nd-Fe-B magnets lowers environmental impacts by 11–64%, saves €10 per kilogram, and avoids 160–279 kg of ore leaching per kg of magnet.
• At just 4% content, dysprosium drives up to 78% of freshwater ecotoxicity and land-use impact in permanent magnets used in EVs and wind turbines, despite being a minor ingredient.
• Material efficiency through dysprosium reduction offers faster, cheaper gains than new mining capacity—extending reserves, lowering price volatility, and improving clean energy sustainability.

---

In a 2026 study (opens in a new tab) published in Sustainable Production and Consumption, lead author Stellina Samuel (opens in a new tab) of Leiden University, with Robert Istrate (opens in a new tab) and René Kleijn (opens in a new tab), delivers a clear and consequential insight: dysprosium (Dy)—a minor ingredient in high-performance magnets—is responsible for a disproportionate share of environmental damage, cost volatility, and geopolitical risk in clean energy supply chains. Modeling neodymium-iron-boron (Nd-Fe-B) magnets used in electric vehicles and wind turbines, the team finds that reducing Dy content from ~4% to ~1% can materially lower emissions, reduce mining intensity, and cut costs—without compromising magnetic performance.

Study Methods

The researchers conducted a full life-cycle assessment (LCA), tracking impacts from ore extraction through magnet production. They modeled magnets with 1–8% Dy content, isolating dysprosium and neodymium as distinct supply chains—a critical step given Dy’s dependence on ion-adsorption clay deposits in China and Myanmar. The analysis spans 16 environmental categories, including climate impact, land use, and freshwater toxicity, as well as raw material cost modeling.

Key Findings

The results are striking. At just 4% content, dysprosium accounts for up to 78% of freshwater ecotoxicity and land-use impacts, and contributes 25–44% of raw material costs. Reducing Dy from 4% to 1% lowers total environmental impacts by 11% to 64%, depending on the category, while saving roughly €10 per kilogram of magnet.

Each 1% reduction in Dy also avoids the leaching of 160–279 kg of ore per kilogram of magnet, along with meaningful reductions in chemical inputs such as ammonium sulfate and ammonium bicarbonate. On a global scale, even incremental reductions translate into millions of tons of avoided mining, particularly in environmentally fragile regions.

Limitations

The study relies on modeled data, including proxy assumptions for mining conditions in Myanmar, where transparency is limited. Variability in recovery rates, ore grades, and future process improvements could shift absolute results. The economic analysis is also confined to raw material inputs, excluding full manufacturing costs.

Implications

This study reframes the rare earth challenge. The constraint is not just supply—it is material efficiency. Dysprosium is both scarce and environmentally intensive; reducing its use extends reserves, lowers exposure to price shocks, and mitigates ecological harm. For investors and policymakers, the takeaway is direct: engineering efficiency may deliver faster, cheaper, and more scalable gains than new mining capacity.

Conclusion

The energy transition does not simply require more materials—it requires smarter use of them. Reducing dysprosium in permanent magnets stands out as a high-impact, near-term strategy to improve supply chain resilience, lower costs, and align clean energy with sustainability goals.

Citation: Samuel, S., Istrate, R., & Kleijn, R. (2026). Mitigating the disproportionate environmental impacts and costs of dysprosium in Nd-Fe-B magnets through material efficiency. Sustainable Production and Consumption.