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One main feature of the power demand profile is it varies time to time and its price changes accordingly. During the peak the less cost-effective and flexible power supplies must complement the base-load power plants in order to supply the power demand. Conversely, during the off-peak period when less electricity is consumed, those costly power plants can be stopped. This is a scenario which Energy Storage System (ESS) and photovoltaic (PV) generation plants could add flexibility and cost reduction to the customers and utilities. These aspects are only achieved due to the ESS, which enables the optimal use of energy produced by the photovoltaic modules through load management and discharge of the battery in the most convenient times.