The concepts and applications of energy storage techniques have been elucidated in this comprehensive and up-to-date book. Researchers and experts have contributed valuable information in this book from across the globe. It discusses a number of energy storage systems including electrochemical energy storage, compressed air energy storage, hybrid energy storage, etc. There is also a detailed description on the future of energy storage systems. The primary aim of this book is to serve as a useful source of information for researchers, scientists as well as students interested in gaining knowledge regarding energy storage systems, their technologies as well as applications.