The price of electricity is dependent on the time – especially when it comes to the volatile generation using renewable energies. This is true for both generators and consumers. It is possible for EnBW to control the electricity demands of its customers if desired so that costs are kept as low as possible, but with the prerequisite that the electricity can be consumed flexibly. This is the case, for example, for water suppliers. They do not need to operate their electrical pumps and storage systems permanently, but can limit their operation to times when the market price for electricity is low or even negative. EnBW develops strategies to control the energy demands of its customers cost-effectively using software (Demand Side Management) – whereby the security of supply always has priority. This is not a new subject for EnBW because it has been operating complex drinking water networks for local authorities itself for many decades.