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Nowadays, with the large-scale penetration of distributed and renewable energy resources, Electrical Energy Storage (EES) stands out for its ability of adding flexibility, controlling intermittence and providing back-up generation to electrical networks. It represents the critical link between the energy supply and demand chains and, moreover, a key element for increasing the role and attractiveness of renewable generation into the power grid, providing numerous technical and economic benefits to the power system stakeholders. On islanded systems and micro-grids, being updated about the state-of-the-art of EES systems and their benefits becomes even more relevant. Hence, in the present paper a comprehensive analysis of EES leading technologies' main assets, research issues, global market figures, economic benefits and technical applications is provided.

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