E3MLab develops and maintains several sector-specific models, including electricity-market specific models. The two major energy models developed and maintained for all the European Union member-states are PRIMES (energy market equilibrium engineering-economic model used for the long term and the study of structural changes in energy markets) and GEM-E3 (general equilibrium macro-economic model applied to World regions and to EU specific countries too). Moreover E3MLab has developed and maintains a stochastic world energy/technology model PROMETHEUS and a large-scale energy demand and supply model the MENA-EDS.