In Germany, drect geothermal energy use is restricted to selected sites only, due to the geological and present economic conditions. The totally
installed low-enthalpy geothermal heating plant capacity is 38.7 MWt, and another 115 MW, are under construction or planned.

However, there is an increasing demand on long-term high-temperature energy storage which results from the peculiarities of combined heat and power generation. The experience gathered in geothermal reservoir engineering (injection, reservoir modelling, geochemical analysis) has proven the suitability of those aquifers for energy storage.

The present paper describes two up-to-date projects namely;
1)Aquifer cold and heat storage as essential part of the energy supply system of the buildings of the German Parliament in Berlin (first energy storage project in Germany which is under construction right now)

2)Improvement of the thermal yield from a low-enthalpy geothermal doublet being operated for 8 years now by increasing the temperature in the reservoir through injection of the excess and waste heat from a co-generation plant (project under planning for the Hannover 2000 World Exhibition).

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