 DER are small grid connecting devices that enable decentralized energy to be stored or generated close to the load they serve with the capacity of 10 megawatts (MW) or less.Centralized power plants use energy to transmit power over long distance, so decentralizing the system uses less energy and encompasses a wide variety of different advancing renewable technologies such as Wind power, Solar power, Geothermal power, Biomass, and Biogas into the system.“European cities are the most advanced in terms of the transition to new energies”, Denis Simonneau, Head of International and European Relations at GDF SUEZ.