Green power or sustainable energy is defined as the harvesting of electric power from sources that are replenishable. This book on green power deals with the various technologies that are used in the creation of sustainable energy. Sustainable energy is closely related to sustainable development and green power. The aim of this book is to present researches that have transformed this discipline and aided its advancement. The topics introduced here are of utmost significance and are bound to provide detailed knowledge to readers about the various theories and techniques of sustainable energy. This book is a complete source of knowledge on the present status of this important field. With state-of-the-art inputs by acclaimed experts of this field, this book targets students and professionals.