Today, we are experiencing a gigantic global transformation of the energy world. Renewable energy is on the rise. A large number of small, distributed energy resources (DERs) is about to replace conventional power plants. And they have a strong support: the Virtual Power Plant. The VPP not only allows to aggregate thousands of electricity producers, consumers, and storage units. By intelligently controlling their feed-in and consumption, their power and flexibility can be valorized on different markets.