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Definition: This is a report detailing supply issues relating to critical metals in low carbon energy technologies. This report examines the use of metals in the six low carbon energy technologies of SET Plan, namely: nuclear, solar, wind, bioenergy, carbon capture and storage (CCS) and electricity grids. The study looks at the average annual demand for each metal for the deployment of the technologies in Europe between 2020 and 2030. The demand of each metal is compared to the respective global production volume in 2010. This ratio (expressed as a percentage) allows comparing the relative stress that the deployment of the six technologies in Europe is expected to create on the global supplies for these different metals. The study identifies 14 metals for which the deployment of the six technologies will require 1% or more (and in some cases, much more) of current world supply per annum between 2020 and 2030. A number of recommendations are provided which include: ensuring that materials used in significant quantities are included in the Raw Materials Yearbook proposed by the Raw Materials Initiative ad hoc Working Group, the publication of regular studies on supply and demand for critical metals, efforts to ensure reliable supply of ore concentrates at competitive prices, promoting R&D and demonstration projects on new lower cost separation processes, particularly those from by product or tailings containing rare earths, collaborating with other countries/regions with a shared agenda of risk reduction, raising awareness and engaging in an active dialogue with zinc, copper and aluminium refiners over by􀍲product recovery, creating incentives to encourage by􀍲product recovery in zinc, copper and aluminium refining in Europe, promoting the further development of recycling technologies and increasing end of life collection, measures for the implementation of the revised WEEE Directive, and investing broadly in alternative technologies. Website: https://setis.ec.europa.eu/system/files/CriticalMetalsinStrategicEnergyTechnologies-def.pdf