The purpose of this book is to provide a basic understanding of the different forms of renewable energy. This textbook emphasizes bioenergy, solar, wind, MHD, hydro, and OTEC. The fundamental analysis of different renewable energy systems is discussed. A total of thirteen chapters are included in this book, presenting the state of the art of renewable energy systems and their applications. An overview of the current renewable energy scenario in India is provided in the opening chapter of this book. The following chapters cover solar, wind, biomass energy, pellets and baling, biodiesel production, biogas, fuel cells, micro hydropower plants, and energy conservation in agriculture. Those who are interested in the field of renewable energy will find this book to be invaluable. This is for undergraduate and postgraduate engineering students, researchers, and anyone else who is interested in this field.