The Geological Survey of Estonia has initiated heat supply from a 712.5-meter borehole in Arbavere, currently the country's deepest thermal borehole.
The borehole, located in Lääne-Viru County's Arbevere village, provides heating and cooling to the Geological Survey's research center buildings.
The project utilizes a coaxial pipe, a first in Estonia, where water flows through the pipe's center, passes through a heat exchanger, and is reinjected through the annular space.
No direct quotes available in the text.
Author's summary: Estonia's deepest geothermal borehole starts heat supply.