This thesis discusses new business models of energy supply companies in Austria and Germany. It is mainly focused on a specific evaluation and analysing system, based on preliminary studies by Osterwalder on business models and the university of Utrecht on innovation research. The applied method is based on specialised literature, internet sources and various studies on energy economy as well as on the analysis of internal company data. The aim of this thesis is to point out possible success factors of new business models as well as to create a useful categorization-system for those. In addition to that it is intended to outline their use for the development of further business strategies. Therefore eight energy supply companies, four of which are based in Austria and four in Germany are examined. The evaluation is developed on a pattern which examines selected business models regarding their context, technology, future-compliance, potential, acceptance, innovation and possible obstacles. The structure of the thesis also goes along these aspects. The introduction is followed by a environmental analysis, which highlights the main aspects of the energy industry on a global and national dimension. In addition to that, selected business models of both countries will be considered. Here both the theoretical basis of the thesis as well as the respective business models will be described in detail, followed by an evaluation of the business models according to the aforesaid criteria. After that specific evaluation there is a more general mode of evaluation, allowing a categorization of selected business models. Referring to research questions, the result of the thesis leads to the identification of a lot of new business models and to their fundamental mode of operation. This shows that new business models can already offer possible alternatives to conventional ones, although most of the pilot-projects that were discussed in this thesis are still small-scaled.