Renewable Energy - Volume 4, Energy Storage Systems - Mechanical, Hydro, and Thermal: Definitions, Developments, Applications, and Case Studies is a new volume in this comprehensive resource on renewable energy, edited by Prof. Abdul Ghani Olabi, for those looking for an extensive reference on these specialized technologies. Providing a unique structured approach to the emerging technologies and advances in energy storage systems, this reference addresses mechanical, hydro, and thermal storage, in a logical and accessible arrangement. From definitions in these technologies, to development in technology and application, to state-of-the-art, analysis, and case studies, this book considers the most requested and desirable practical elements for energy storage systems from an applied perspective. This coordinated approach allows for standalone, accessible, and functioning chapters dedicated to particular technologies. This is a suitable reference for postgraduate and graduate students, post-doctoral researchers, faculty, engineers, and industry personnel working on projects related to renewable energy, energy storage, sustainability, and energy system design.