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This paper describes an approach to simulate the energy consumption of machine tools for a specific production task by modelling the energetic interactions of the machine tools' components and implementing the models in a simulation environment. By connecting a hardware machine control system with the simulation model, NC-code information is utilized and machine tool specific characteristics of the simulation model behaviour are achieved. Exemplarily, a specific machine tool is modelled and the energy consumption of a production process is simulated. The impact of the implementation of an improvement measure as well as the payback period of the investment is reviewed.