The core of the book is the presentation of a systematic, continuous and logical chain into the coupled total energy system (GES) of the future, which will lead to the fully sustainable use of renewable energies. Thus, unified models are proposed that are applicable to the subsystems/sectors throughout and allow the optimization of the entire GES. Appropriate algorithms and approaches are illustrated with numerous examples. This is embedded in the context of efforts to fully integrate energy generated from renewable sources into the GES. The overarching role of IT systems for secure...