Fundamentals of Renewable Energy Sources discusses the importance of this topic from both economical and environment point of view. This book provides a platform for teachers, researchers, manufacturers and students etc. to understand the basic fundamental principles, energy balances, modeling, economic analysis and applications of renewable energy sources. Which include Solar, Photovoltaic, Biomass, Biofuels, Biogas, Hydro, Wind, Geothermal, Ocean, Tidal, Waves and Animal energy. The elements of heat transfer, thermodynamic cycles in biopower generation, environmental impact, embodied energy and life cycle cost analysis of renewable energy sources have also been discussed.