Increasing decentralization is one of the major challenges for building, operating and maintaining infrastructure. Consumers and producers of energy are closely intertwined in networks. To supply the cities of the future with energy reliably and in a resource-saving manner, power grids and buildings must become more intelligent. Mathematical methods – such as artificial intelligence – help to solve these problems. These build upon data generated by electricity meters, lighting, air conditioning and heating systems, as well as combined heat and power plants and transformer stations.