The thesis investigates the techniques that may be used by an aggregating company for better utilization of the assets owned by its clients to obtain profits by taking into account the volatility of energy prices on the Day-Ahead Market. In further parts of the thesis a concept of energy cluster is analysed, with focus on how aggregation can not only benefit the retailer, but also the members of such energy community, by helping them fulfill their objectives on decreasing their dependence on external resources. Not only the price incentives' and optimization algorithms' influence will be simulated, but also further development of a microgrid i.e. additional installations that may contribute to this cause.