Starting with a comprehensive overview of energy storage technologies and their emerging codes and standards, the book discusses energy storage capacity requirements in electricity mix scenarios at different levels; energy storage in microgrids; energy storage in electricity markets; the role of storage in transmission investment deferral and management of future planning uncertainty; sizing of battery energy storage for end user application under time of use pricing; evaluation of multiple storage benefits and optimization of energy storage operations in distribution networks; use and role of flywheel energy storage systems; forecasting and optimization for multi-purpose application of energy storage systems to deliver grid services (a case study of the smarter network storage project); and optimal coordination between generation and storage under uncertainties. Also included are country-specific case studies from Romania, Italy and Turkey.