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The role and support of renewable energy sources have increased rapidly over the last years because of raising energy demand, energy dependency, increasing and variable energy prices and concern about climate change. On the other hand wind generating units are exposed to the smallest changes in weather, which may significantly alter their production. In present paper a simulation tool is introduced, that is capable of simulating the cooperation of a generic energy storage unit and a wind farm, with the aim of decreasing the difference between forecasted and actual wind power production. The control of the rule-based simulation is introduced, and the operation of the tool is demonstrated, using the wind statistics of Hungary. A possible rated power and rated energy is calculated for an energy storage device. Third part of the paper investigates the effect of such storage device on CO2 emissions and balancing energy, by comparing the today's situation to possible future scenarios.