This book presents new and practical solutions to solve the coordination problem faced due to the increasing integration of renewable energy sources into existing electricity transmission networks it addresses how the subsequent technological revolution is not only affecting the structure of the electricity markets, but also the interactions between transmission system operators (TSO) and distribution system operators (DSO). A must-have for smart grid analysis, this book presents models and scenario buildups of complex systems and incorporates the experience of three technological pilots that are analyzing special issues connected to network monitoring and control, and participation to a would-be ancillary services market from special subjects. The reader will benefit from the experience drawn from SmartNet, a major research project encompassing 22 partners from nine EU countries and including input gathered from a significant number of industrial partners.