The future and development of energy is one of the most important problems in both domestic and global politics. Limiting the use of fossil fuels in the energy sector results from new legal conditions related to the protection of the natural environment. These changes require the development of a new energy strategy, taking the limits of greenhouse gas emissions in the European Union and the requirements of the Community energy policy into account. One of the documents affecting the structure of Poland’s energy mix is the Directive on renewable energy sources (2009/28/EC). Poland has committed to achieving the goal of a 15% share of energy from renewable sources (RES) in gross final energy consumption by 2020. Current changes in Polish RES support systems – in particular the transition from the system of green certificates to auctions for green energy – may threaten the achievement of the above-mentioned goal. The article analyzes whether Poland will meet renewable energy obligations by 2020 under the current conditions. In addition, the article presents current energy consumption in the world and in the country, legal conditions taken into account when creating the country’s energy mix and forecasts of renewable energy demand.