This book provides comprehensive insights into the field of sustainable energy systems and technology. It elucidates new techniques and their applications in a multidisciplinary approach. Sustainable energy refers to the form of energy which can be used without causing harm to nature. The objective of sustainable energy systems is to find efficient ways to use resources so that they fulfill the need of the present generation while being available for the future as well. It aims to protect environmental and natural resources. The different types of sustainable energies currently available are solar energy, hydropower, biofuels, green power, etc. From theories to research to practical applications, case studies related to all contemporary topics of relevance to sustainable energy have been included in this book. The objective of this text is to provide a comprehensive overview of the different areas of this field along with technological progress that has future implications. It will serve as a valuable source of reference for engineers, environmentalists, ecologists, researchers, students and for anyone who wants to delve deeper into the study of sustainable energy.