Sustainable energy is the need of the century and energy storage will play a characteristic role in integration and operation of future microgrids and smart grid networks. Energy storage can definitely aid in addressing the issues of integrating intermittent renewable power and in improving the utilization and efficiency of such hybrid systems. The need and the application areas of storage in hybrid renewable systems are explained in brief in this chapter. The chapter also entails the various types of storage systems and their probabilistic market areas. Some of the most prominent path breaking case studies for significant storage applications are also included in this chapter. The chapter concludes by identifying the technical challenges facing the deployment of storage systems globally. © 2018 Elsevier Ltd. All rights reserved.