The article deals with the development of tools supporting a higher degree of visualization in order to assess the workload of electrical appliances installed in machine-tools. A higher degree of visualization means to forward the interpretation of the results from commonly used tables, graphs, and also 2D visualization, to 3D visualization. This enables us a considerably easier orientation in the virtual phase of the design and the control of not only the energy consumption of the machine-tools, but also of their structural nodes. The first part of the article deals with the possibilities and application of 3D visualization including the work with the required input data. There is a detailed description of how to construct the necessary data to create a 3D model, if these data are not available. The second part is concerned with the application created for simulation of energy flows in the machine-tool in dependency on time. There are described some of the obstacles that must be solved and also the benefits of the proposed solutions for the user. Finally, the present article briefly describes possible future developments of the software concerned. The tool developed for visualization was applied to the machine FUEQ 125 Efektiv company TOS Kurim in cooperation with the Czech Technical University in Prague, Faculty of Mechanical Engineering, VCSVTT – Research Centre for Manufacturing Engineering and Technology.