This paper analyzes the PV power plants operability improvement obtained when introducingenergy storage (ES) systems which allow decoupling the power received from the sun on thephotovoltaic (PV) panels from the power injected by the power plant into the grid. Two energymanagement strategies are presented and analyzed, using Li-ion batteries as the energystorage buffer. The generated power redistribution and its variability reduction are All the results obtained in this paper are based on one year long simulations which used real irradiance data sampled every two minutes.