Renewable thermal energy systems: closed (BTES) or open source (ATES)

Shallow geothermal energy (between approximately 50 and 150 m deep) is particularly economically viable today. Moreover, such shallow geothermal energy offers a solution for both heating and cooling. Depending on the application and the geological characteristics of the ground, either a closed system (BTES) or an open source system (ATES) can be applied.


During the winter, heat is extracted from the soil and delivered to the building with a ground source heat pump. This cools the soil a few degrees towards the end of the winter.

In the case of thorough design and operation, such systems are very energy efficient and lead to a very important reduction of CO2 emissions.

More than just a source of renewable energy, BTES and ATES systems provide seasonal thermal energy storage that is applicable for heating and cooling of buildings.

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