Croatia discovers another urban area harboring geothermal capabilities for district heating systems

In a significant development for Croatia's renewable energy sector, exploratory activities in the city of Osijek have confirmed the presence of substantial geothermal potential. This marks the second successful completion of such activities within a broader project aimed at harnessing geothermal energy for district heating.

The testing and measurements of the Osijek GT-1 (OsGT-1) well revealed a reservoir temperature exceeding 100 degrees Celsius, indicating a promising source of geothermal energy. The funding for these exploratory activities was secured from the National Recovery and Resilience Plan (NRRP).

The estimated thermal capacity of the Osijek GT-1 well is nearly 5 MW, and additional wells are planned at sites with confirmed geothermal potential after completing all exploratory activities.

Private companies, such as ENNA Geo, are also engaged in geothermal research alongside state-funded activities. ENNA Geo, part of the ENNA Group, one of Croatia's fastest-growing companies focused on renewable energy and innovation, is likely to be involved in developing and investing in technologies and projects that advance geothermal energy as a sustainable resource.

Geothermal temperatures in Osijek are lower than those in Velika Gorica due to local geological specifics and shallower reservoir depth. Despite these differences, geothermal energy can be adapted to local needs and used efficiently and sustainably.

Ivan Radić, Osijek's mayor, stated that geothermal energy is becoming a locally available and sustainable heating source for both residents and businesses. Marijan Krpan, president of the agency's management board, emphasized the stability and renewable nature of geothermal energy.

Exploratory activities will continue in Vinkovci and later in Zaprešić after Osijek and Velika Gorica. The Pannonian Basin, where these cities are located, has a substantial geothermal potential, according to research. Geothermal energy presents a strategic opportunity for long-term supply security and decarbonization of the energy system.

The results from the Osijek exploratory well suggest significant geothermal resources in the area with potential applications in district heating, agriculture, and the area's economic development. As Croatia continues to explore and harness its geothermal potential, it moves closer to a more sustainable and secure energy future.

Croatia discovers another urban area harboring geothermal capabilities for district heating systems