The energy system, and in particular the electricity system, is undergoing rapid changes due to the introduction of renewable energy sources, to mitigate climate change. To cope with these changes new policies and technologies are proposed and a range of business models are implemented in various energy systems across the world. New concepts, such as smart grids, flexumers, or prosumers, are developed and tested in pilot regions. Still, studies rarely systematically compare different approaches, data, or regions, in part because freely available research data are lacking.
