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The awareness of the greenhousegas effect and rising energy prices lead to initiatives to improve energy efficiency. These initiatives range from micro-generation, energy storage and efficient appliances to controllers with optimization objectives. Although these technologies are promising, their introduction may rise further questions. The implementation of such initiatives may have a severe impact on the electricity infrastructure. If several of these initiatives are introduced in a combined way, it is difficult to analyse their overall impact. In this paper a model is defined and a developed simulator is described to analyse the impact of different combinations of micro-generators, energy buffers, appliances and control algorithms on the energy efficiency, both within the house and on larger scale. The simulator is easily adaptable to new types of micro-generators, controllers and other supported devices. Simulation of two case studies with the simulator shows that the achieved results are promising.