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Site preparation underway for Osijek GT-1 exploratory geothermal well; drilling and testing expected by late Q2–Q3 2025

In early April, as part of the National Recovery and Resilience Plan (NRRP)  and the initiative “Development of Geothermal Potential for District Heating”, construction works began on the preparation of the site for the drilling rig that will be used to drill the Osijek GT-1 (OsGT-1) exploratory geothermal well. The well will be located in the suburban settlement of Tenja, near Osijek.

This is the second exploratory geothermal well to be financed under the National Recovery and Resilience Plan,  following the ongoing Velika Gorica GT-1 project.

The well is planned to reach a depth of 2,000 meters (±200 m), targeting a predicted Neogene reservoir where water temperatures are expected to reach approximately 100 °C at around 1,900 meters.

The project aims to confirm the geothermal potential of this part of the Pannonian Basin, with a particular emphasis on its application in district heating. Its successful implementation will support the expansion of renewable energy sources and contribute to a more sustainable energy mix in Croatia.