In order to define an appropriate energy regulatory policy at the state level, encourage energy efficiency, control the level of final energy consumption and select production technologies, it is important to choose an adequate approach to energy modeling. Hence, this paper will focus on the overview of the most important energy modelling tools. Energy models can be developed for efficient forecasting, planning, design, operation and optimization of energy systems. The heterogeneity of applied energy models and the energy scenarios defined in them require specific, technically advanced skills for an adequate assessment of movements in such a multidisciplinary discipline. The paper analyzes crucial differences between tools, giving an useful insight in contemporary research of energy efficiency projections. A overview of these tools is essential for sustainable energy development and efficient business of energy companies. A comparative comparison of energy modelling tools is also shown, with the intention of pointing out the importance of all models and their differences, in order to indicate which area of investigation is especially significant for a particular model.