Security and competitiveness are two very important aspects of the economic and political development of every country. In the 21st century, one of the key drivers of most economies in countries throughout the world is energy. Different countries adopt different measures so as to ensure their security and competitiveness through the effective energy policies that make traditional and renewable resources adequately available hence eliminating the possibilities of shortages. Our paper takes up the case study of Germany as one of the wealthiest and most developed economies in the European Union which also occupies the first positions in the charts of energy uptake and consumption. German policy-makers realize its vulnerability when it comes to energy security and attempt to diversify its energy competitiveness using the renewable sources of energy (for instance via the adoption of the Erneuerbare-Energien-Gesetz or the "Renewable Energy Act" (EEG)). We analyze the issues of energy security and competitiveness of a country using an example of Germany. Moreover, we describe what challenges the renewable energy sources (RES) might bring into the conventional game and how this might influence the competitiveness and security.