The contribution deals with a possibility of utilisation of renewable energy sources; an analysis of risks of their use is made. As an example of European activities, the activity of non-profit association Eurosolar seated in Bonn, which focuses on towns, municipalities, industrial and commercial enterprises, and also on individuals, institutions, organizations, and on the inclusion of young generation at schools, is given. Fundamental advantages and disadvantages of renewable energy sources, including assumptions of increasing their share in electricity generation are presented. Geothermal energy, wind energy and solar energy are discussed.