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This paper covers some design and operation aspects of distributed battery micro-storage systems in a deregulated electricity market system. In this paper, the term “micro” refers to the size of the energy storage (ES) system compared to the grid generation, with a capacity from few kilowatt-hours and up. Generally, ES enhances the performance of renewable distributed generators (DGs) and increases the efficiency of the entire power system. Energy storage allows for leveling the load, shaving peak demands, and furthermore, transacting power with the utility grid. In this paper, different design aspects of distributed micro-storage systems are covered such as system architecture, system sizing, power stage design, battery management system (BMS), economic aspects and operation in a deregulated electricity market with and without renewable DGs.