Deep and shallow geothermal energy
Research and consulting services within deep geothermal energy, shallow geothermal energy, as well as groundwater cooling and energy storage.
Climate change calls for new energy solutions which can reduce emissions of CO2 into the atmosphere. Some of the techniques available to meet this demand include exploiting both deep and shallow geothermal energy, as well as groundwater cooling and energy storage.
GEUS’ activities in brief
GEUS is the key advisor for Danish authorities. Furthermore, GEUS is working closely with the many different stakeholders in this part of the energy sector in order to minimise costs and risks and thereby increase competitiveness in relation to conventional types of energy.
For many years now, GEUS has been providing research and consultancy for assessment of deep geothermal resources in Denmark, in close collaboration with private companies and public-sector institutions. Primarily, this work includes developing geological models of the Danish subsurface. These models describe and predict the location of geological layers with large quantities of hot water which can be pumped up from the subsurface to the surface.
Furthermore, in connection with exploitation of shallow geothermal energy, groundwater cooling and energy storage, GEUS takes part in surveys and assessments of the thermal properties of soil, and in assessments of the heat flows in the upper 300m of the Danish subsurface. The assessments also cover groundwater and heat flows as well as the energy balance in the soil. This is to protect the environment as much as possible as well as to establish cost-effective and efficient installations.
Deep geothermal energy
Moving down into the Danish subsurface, the temperature increases by around 30 degrees Celsius for every kilometre. Geothermal energy can be exploited in areas with hot, water-bearing geological layers from where water can be pumped up. Normally, geothermal heat is exploited by pumping the hot water up through a production well and then extracting the heat. The cooled water is then pumped back down into the subsurface through an injection well.
Shallow geothermal energy
This technique exploits the energy in shallow wells, where heat is obtained from holes drilled in the soil down to a depth of 100-300 metres. The heat is absorbed in a liquid which circulates in a closed-loop system in the well, and the heat is then released in a heat pump on the surface.