Qualitative Potential Identification of Hydrothermal Systems – a case study in Bad Soden-Salmünster, Germany

Abstract

Geothermal energy plays a secondary role on the extension of renewable energies in Germany and other European countries up to now. However, geothermal energy can contribute significantly to basic load compatible and peripheral electricity and heat supply. Bär et al (2011) developed the qualitative potential identification method which allows the assessment of geothermal systems at relatively low financial cost and technological effort. Exploiting hydrothermal systems by means of existing middle deep boreholes, e.g. from spas, hydrocarbon exploration or mining, can be a cost-efficient possibility to use geothermal energy. In this case study the qualitative potential identification method is adopted for the hydrothermal system of Bad Soden- Salmünster spa involving - Structural and hydrogeological investigations, - Construction of an underground model to predict underlaying rock formations, as well as - Outcrop analogue study including the measurement and calculation of thermophysical and hydraulic rock properties. Finally, the economic viability of the exploitation of the hydrothermal system is assessed by the use of the qualitative potential identification method.