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GEM-E3 is an applied general equilibrium model that covers the interactions between the Economy, the Energy system and the Environment. It is well suited to evaluate climate and energy policies, as well as fiscal issues.

The GEM-E3 model has been used for several Directorates General of the European Commission, as well as for national authorities. The GEM-E3 modelling groups are also partner in several research projects, and analyses based on GEM-E3 have been published widely.