Climate change is one of the most controversial issues. There is a part of society that believes that climate change is happening due to the change in people’s economic activity, while the other part believes that over the course of millions of years the temperature in the Earth’s atmosphere changes cyclically. Whichever the truth, action towards climate change and possibilities to reduce the environmental impact are becoming more proactive in the last decades. One of the ways to mitigate environmental impacts is the shift from using fossil fuels towards using renewable energy, which would directly reduce the amount of greenhouse gas emissions in the atmosphere. The promotion of the use of renewable energy is also in line with the targets set by the European Union (EU) for the next decades. One of the top targets for European Union (EU) is to reduce greenhouse gas (GHG) emissions. Each Member state has undertaken to reduce the greenhouse gas (GHG) emissions and to achieve targets set for 2020 and 2030. Energy strategy 2020 sets forth that the primary energy consumption should be reduced by 20 % (compared to the forecasted development tendency), portion of the renewable energy sources (RES) into the total energy consumption should be increased by 20 %, and greenhouse gas emissions should be reduced by 20 % compared to 1990 level. The EU has set numeric targets for increasing the share of renewable energy in final energy consumption. The author believes that in order to ensure that the introduction of renewable energy resources are in line with the objectives set by the directive, it has to be sustainable. Sustainability refers to factors linked to the economy, innovation, climate and environmental adequacy and climate change mitigation. Based on sustainability factors, the author puts forward four aspects in this thesis, which shows that the choice of renewable energy resources is not one-sided, but linked and evaluated from various aspects.