Beginning with an overview of renewables (including solar, wind, hydro, tidal, wave, geothermal and biomass energy) this textbook deals with the fundamentals and practical applications of various renewable energy systems as a promising replacement of the conventional steam power stations utilizing fossil fuels. The main attention is focused on the electrical energy technologies with high development potential such as photovoltaics and wind turbines. The textbook is intended for students and specialists working in the electric power engineering.