As a result of the energy transition and the associated change from conventional power plants to regenerative plants, energy management is becoming increasingly important. While the feed-in behavior of conventional energy producers depends on the expected consumption, wind power and photovoltaic systems have a volatile feed-in characteristic that is detached from the load. These fluctuations cause at worst an instability of the power grid. To prevent this, we offer energy management systems based on battery storage technology. The systems can not only compensate for short-term fluctuations in the grid, but also provide long-term reserves: surplus electricity from renewable sources is stored in order to feed it back into the grid in the event of power shortages.