Geothermal energy

Geothermal energy originates from the center of the earth, where temperatures are as high as 2.000 to 8.000 ˚C. This heat can be transformed  into energy. The Dutch subsurface offers great opportunities for geothermal energy.

How does geothermal energy work?

Geothermal energy uses warm water from aquifers located at a depth of one to four kilometers. To extract the hot water water a well consisting of  two bore holesis drilled: one for production and one for injection. The production well pumps the water to the surface and leads it to the geothermal plant. The injection well is used to pump the cold water back into the earth. This way the water level in the reservoir remains stable. This system is called a geothermal doublet.

Heating and electricity

From about 1,8 kilometers beneath the surface the aquifers in the Netherlands are hot enough to produce water of 70 ⁰C or more, which is enough to supply tap water of heating for buildings or greenhouses. From about 3 kilometers the temperatures are high enough for electricity production. As a consequence of the heat radiating from the center of the earth, the temperature of the earth increases with 3 ⁰C every hundred meters.

Advantages of geothermal energy

  • The project will pay itself back within 5 to 10 years. After that, energy will be almost for free;
  • Marginal CO2 emissions;
  • No waste, noise or other emissions;
  • Vast availability and controllability;
  • Low maintenance costs.



T&A Survey's department of Sustainable Geothermal Energy (ODE) consists of a team of experienced geologists, engineers and project managers to whom the substrate has no secrets. T&A Survey has performed many studies for geothermal energy and in 2013 it has managed and supervised Holland's most succesful geothermal energy project Green Well Westland.

Geothermal roadmap

T&A's geothermal projects are focussed on risk minimalization and output optimalization. In order for a project to succeed, several steps have to be taken. T&A Survey can provide all necessary services. This way we guarantee consistency and a shorter lead time of your geothermal project.