A new report from the WWF is warning that the growing demand for renewable energy could put pressure on the supply of critical materials required in the production of renewable energy infrastructure.

The report, Critical Materials for the transition to a 100% sustainable energy future, says supply chain bottlenecks can be overcome by applying the right technologies.

WWF Global Energy Policy director Dr Stephan Singer says the growing demand for other technologies - like mobile phones, flat screen TVs, computers and batteries for example – which use the same critical materials as renewable energy, is driving enhanced mineral exploitation.

“A new political legislation is needed in all major economies to promote material recycling and drive substantial technological development to ensure that critical materials required to make renewable energy technology remain available,” he says.

Specifically identified critical materials are:

• The most critical supply bottlenecks of non-energy raw materials are lithium and cobalt –WWF says the bottlenecks can be alleviated by recycling lithium, substituting lithium in other sectors, and by using less cobalt-intensive cathodes.
• Some authorities and institutions warn of shortages of some rare earth materials before 2020. But the challenge may not be geological, but geopolitical.The report says eliminating the geopolitical constraints may be difficult in the short term, but possible in the longer term as resources become available in other geographical areas as well.
• Indium, gallium and tellurium, used in solar power (photovoltaics), are not expected to become important bottlenecks as they can be substituted by applying technologies requiring less critical materials, such as silicon.
• Supply bottlenecks are likely to pose less of a problem also for copper, which is used for transition grids and increasingly for highly-efficient appliances.

Ecofys Director of Science Kornelis Blok, responsible for the research for the report, says it is clear that supply chain bottlenecks occur, but with the right technology choice these can be avoided.

“The report provides important guidance to technology and system suppliers. It may help them to make the right choices in making their products future-proof”.

Governments must legislate strong incentives and create regulations for enhanced recycling and reuse of precious and rare materials, says Singer. “In parallel, research and development must be fostered for new materials and high material efficiency.”