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In the first section of the paper, the authors try to give a complete picture on the obligatory electricity off-take system, and the Hungarian tariff structure using the schedule and production data of wind power plants for 2010, errors of the schedule has been calculated. For better understanding of the results, persistence forecasting techniques are used for comparison. In the second part of the paper, a possible method is proposed to decrease the error of forecasts by using energy storage. A simulation tool has been developed to simulate the cooperation of a wind farm and an energy storage unit. Using the data of 2010, both financial and technical aspects were examined. The results show, that such unit is able to mitigate the error of the forecasts, even with simple control. Based on the results of the simulations, the authors propose a future way for both generating units and the TSO.