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Control of the energy center in apartment building in Stuttgart

enisyst controls innovative energy concept for 22 residential units


An innovative energy concept was created for an apartment building at the Möhringen train station. 22 residential units are to be supplied with energy using sustainable resources. 

A large part of the energy for the apartment building is generated by the photovoltaic system on the roof as well as electricity-generating special foils on the balcony parapets. This energy is available to the residents in the building at low cost. The heart of the complex energy system is a large battery storage unit in the basement. This ensures that the self-generated electricity is also available in the evenings and at night – including at the 22 charging stations for electric vehicles offered by Stadtwerke Stuttgart in the underground parking garage.
The apartments are heated by a special heating system that uses wastewater heat. This is tapped by a special heat exchanger that has been installed in the public sewer system under the property. There, constant temperatures of around 14 degrees Celsius prevail all year round, which are brought up to the flow temperature of the heating circuit in the building’s heat center with the help of a heat pump.


  • Control of the energy center, buffer storage and battery charging and discharging.
  • Intelligent load management for 22 charging points
  • Acquisition and provision of monitoring data for the research project


  • Building with 22 residential units and one commercial unit
  • 22 charging stations for electric vehicles
  • Battery storage
  • Wastewater heat recovery via heat pump
  • PV system on the roof and in balcony parapets


The Steinbeis Innovation Center will provide scientific support for the project until the end of 2022 in order to document whether the energy concept with the large-scale battery storage system is successful and how the individual aspects develop over the first years of operation. The data collection is financed by the German Federal Ministry for the Environment.