The main topics concern: Energy resources of the Earth - pollution of the environment from energy production; Renewable energy sources – physical backgrounds, classification; Solar energy - basic concepts, assessment of solar energy potential; Thermal solar systems - thermal solar collectors, passive solar architecture; Photovoltaics – PV cells, structure and principle of operation, characteristics; Photovoltaic modules – connections, types, technologies; Photovoltaic generators - circuits, electronic converters for PV generators, calculation methods; Wind energy - general information, wind generators, types, structure, environmental impact; Electric generators for wind turbines; Wind energy conversion systems - configurations, schemes, applications; Hydropower - small hydropower plants, water turbines, impact on the environment; Geothermal, hydrothermal and aerothermal energy; Heat pump installations; Energy from biomass – resources, obtaining heat and electricity from biomass, biofuels; Use of hydrogen as a source of energy - fuel cells; Hybrid systems with RES - structures, devices and energy storage systems; Estimation of the profitability of renewable energy systems.