The Geological Survey of Estonia (EGT) has completed the country’s deepest geothermal borehole, reaching a depth of 712.5 meters in the village of Arbavere, Lääne-Viru County. The borehole now provides efficient heating and cooling for the buildings at EGT’s research center.
The Arbavere pilot project uses a coaxial pipe system, the first of its kind in Estonia. Water flows through the central pipe, passes through a heat exchanger, and is then reinjected via the annular space. The borehole has a thermal capacity of 40 kW.
To enhance performance, three geothermal heat pumps have been installed to raise the temperature, and a cooling system has been added to one building. A 5G-based smart control system manages the heating and cooling network, enabling advanced energy optimization.
The total investment for the Arbavere pilot project amounted to EUR 1.3 million.