Geothermal energy uses the natural heat flow in the earth’s interior and represents a base-load capable, CO2-neutral energy source for the production of heat and electricity. The underground space can also be tapped and used for material (H2, CO2, natural gas) and energy storage (heat, cold). Fraunhofer Energy Alliance conducts research in the field of exploration, development and technical connection to existing and future supply structures and makes a significant contribution to opening up the markets for the application of geothermal energy systems, the storage of energy sources and technologies for the coupling of the energy sectors heat and electricity in an even more targeted manner.