Are rare earths used in solar panels?


A new report by the French Environment and Energy Management Agency (Ademe) shows that rare earth minerals are not widely used in solar energy and battery storage technologies. And despite their name, they aren't actually that rare at all.

“Their criticality is mainly related to the current virtual monopoly of China for extraction and processing,” the agency said, noting that the country accounted for 86% of the world's production of rare earth minerals in 2017.

The extraction of rare earths has a significant toxicological impact on the environment, depending on the nature of the reserves. Ademe said the presence of thorium and uranium in deposits can mean that rare earths create a type of radioactive pollution that is different from other types of waste. However, the agency ultimately concluded that the renewable energy sector actually barely uses such materials.

At present, rare earths such as neodymium and dysprosium are mainly used in the permanent magnets of offshore wind turbines. Onshore wind turbines also use them, as is the case for turbines in about 3% of wind farms in France, but alternatives exist. For example, it may be possible to make asynchronous or synchronous generators without permanent magnets, to reduce the need for rare earths. But without alternative solutions over the next 10 years, the wind sector may end up accounting for 6% of annual neodymium production and more than 30% of annual dysprosium output, given that the global offshore wind sector is eventually expected to reach 120 GW of cumulative capacity.

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In the battery sector, Ademe said that rare earths are not used, or if they are, they are utilized in very small quantities, and sometimes possibly as an additive. Only nickel metal hydride (NiMH) batteries include a rare earth alloy in the cathode. However, compared to lithium-ion batteries, they are expensive and “their use will remain very marginal in the energy transition,” said Ademe, adding that commercially available PV technologies do not use rare earths.

“Ademe is bringing concrete and factual information to this discussion on rare earths – a subject on which many untruths are circulating today in the public debate,” said Jean-Louis Bal, the president of Syndicat des énergies renouvelables (SER), a clean energy trade body in France.

However, a lack of rare earths does not mean that the components of solar modules are harmless. Thin-film PV technologies, for example, contain potentially critical metals such as tellurium, cadmium, indium and silver.

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