Field measurements for a High Temperature Energy Storage site (H-BTES)
Many feasibility studies, including investigations of the geological conditions, are presently performed for a large-scale energy storage in Linköping. The planned storage will consist of up to 1400 boreholes each around 300 m deep with an individual spacing of five meters that will enable to store 100 GMh heat in summer for heating in winter.
The investigations included drilling of three 240 – 300 m deep test boreholes. Thermal response tests and geophysical wire-line logging collect data inside these boreholes. Bedrock mapping and magnetic and electromagnetic (VLF) geophysical surveys were applied on the ground surface. Thermal conductivity scanning was performed on rock samples.
This multidisciplinary approach resulted in a detailed picture of the underground composition and the thermal properties of the rocks. Further studies aim towards a 3D bedrock and fracture model as well as an evaluation of the hydraulic conditions.
For more information, please contact:
Mikael Erlström, State geologist, Geological Survey of Sweden