Although presently utility power systems operate successfully without energy storage, cost-effective ways of storing electrical energy can help make the grid more efficient and reliable. Electric energy storage systems (ESSs) can be used to store excess electricity generated during off-peak periods for discharging it at peak hours and thus substituting the generation reserve when it is more required. This book aims to provide major insights and projections regarding the future of emerging energy storage technologies in utility power systems around the world. This book provides both the comprehensive analysis and extensive data of leading emerging ESS applications. It includes a broad analysis of the new market for energy storage technologies applied in the global utility power sector.