Abstract
The wise use of energy is essential to address the problem of a steady increase in global energy demand. Efficient technologies are required to extract energy from the resources and utilize in effective ways. Energy storage systems help to build a more robust energy grid and save costs for utilities and consumers. The major portion of end-use energy is thermal energy and storing it aids in the effective utilization of available resources. Thermal energy storage (TES) is used in load leveling where there is a mismatch between energy demand and energy generation. There are different types of TES techniques in practice. The selection of a TES technique depends on the type of application, duration, size, etc. This chapter provides an insight that focuses on TES, different types of TES techniques, and its various applications in increasing the energy efficiency.