Underground Thermal Energy Storages: Optimising the integration of Aquifer Energy Storages in the energy supply system for the German Parliament Buildings, Berlin

Energy demand, the system components of energy supply systems, and the Aquifer Thermal Energy Systems in particular show different temporal behaviour. In comparison with common energy supply components, the temporal behaviour of ATES is almost steady. This implies conflicts between the optimal operation of the system as a whole and the usually sluggish response of ATES.

The main objective of the research project is the development of methods for optimising the operation of individual components as well as of the entire energy system. Eventually the results will be used to develop concepts for future energy supply systems including Aquifer Energy Storage Systems.
Apart from energy investigations, the monitoring of chemical and biological parameters of ATES are important to achieve a sustainable and secure operation.
In addition, the chemical and biological monitoring allows the early detection of changes associated with the use of the aquifer, documents the environmental impact and enables the development of maintenance schedules, especially with respect to the given ATES-condition.

The supply of electric energy, heat and cold to the German Parliament Buildings is provided by a combination of systems which is unique so far.
Heat from cogeneration systems or cold from the environment is made available even at times when no heat or cold is provided directly. This is achieved with seasonal heat and cold storage in aquifers. Both Aquifer Thermal Energy Storage Systems (ATES) are located below the “Platz der Republik” in front of the “Reichstags” building and they have been in operation since 2000.