The Diploma thesis in theoretical part deals with description of possibilities of accumulations of electricity energy focusing on electrochemical accumulators. Next chapter of theory also describes possible applications of battery storages focusing on costumer. In practical part diploma thesis deals with suggestion of simulation model for battery application peak-shaving. Output of the suggestion represents two case studies based on real data of commercial building consumption. Furthermore, practical part also deals with suggestion of control logic for application peak-shaving which was used for verification of simulation model.