Energy engineering is defined as the design and development of electrical systems and circuits that enable transmission and distribution of electrical energy. This book on energy engineering discusses the various technological advances that have been made in the field of energy engineering. Renewable energy practices and efforts to increase work per unit of energy are methods that are followed in this field. It presents this complex subject in the most comprehensible and easy to understand language. This book aims to shed light on some of the unexplored aspects of energy engineering and the recent researches in this area. There has been rapid progress in this field and its applications are finding their way across multiple industries. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.