Thermal energy storage refers to a collection of technologies that store energy in the forms of heat, cold or their combination, which currently accounts for more than half of global non-pumped hydro installations. The potential market for thermal energy storage on future low-carbon energy systems and associated social and economic impacts are enormous, with significant progress having been made in recent years. Following an introduction to thermal energy and thermal energy storage, the book is organised into four parts comprising the fundamentals, materials, devices, energy storage systems and applications of thermal energy storage. Chapters cover topics including materials properties, formulation and manufacture, as well as modelling at the material and device scale. Edited by a leader in the field, and with contributions from internationally renowned authors, this title will appeal to graduate students and researchers in energy, energy storage, materials engineering, chemical and process engineering, mechanical engineering and manufacture technologies.