Geo Power Zagocha - future geothermal power plant near Slatina

At ENNA Group, we focus on projects that lead the green transformation by applying advanced technologies and sustainable practices. One such project is the construction of the Zagocha Geothermal Power Plant (GTE Zagocha) near Slatina, a geothermal project in the highest phase of development in Croatia.

ENNA Group has been developing this project since 2022, and the power plant could begin operations as early as 2028.

The planned capacity of the future power plant is 20 MW, which makes it the largest ORC (Organic Rankine Cycle) power plant in the European Union, with the investment value exceeding €140 million. ORC technology guarantees a closed system, and therefore the cleanest method of electricity generation.

In 2024, the company Geo Power Zagocha signed a Concession Agreement with the Ministry of Economy for the exploitation of geothermal water in the “Slatina 2” exploitation field for a period of 25 years, with the possibility of extension. This agreement allows the company to carry out exploitation works.

In August 2024, at the “Slatina 2” exploitation field, located 15 km from the town of Slatina, Geo Power Zagocha commenced works on the development drilling of the Podravska Slatina GT-6 (PSGT-6) well.

The drilling was completed in March 2025, after which initial production testing was carried out, confirming the significant geothermal potential of the Slatina 2 field. At a depth of 4,582 metres, geothermal water suitable for electricity production was discovered, with a bottom-hole temperature of 202°C.

In August 2025, an additional so-called rigless production test was successfully carried out on the Podravska Slatina GT-6beta (PSGT-6beta) well. Measurements of pressure and temperature conditions in the well recorded a maximum bottom-hole temperature of 211°C at PSGT-6beta, while the surface temperature of the geothermal water reached 180°C.

All conducted downhole and surface flow measurements, water geochemical analyses and gas analyses will provide a broader picture of the geothermal potential of the Slatina 2 geothermal field.

Below, you can watch a video showing the additional rigless testing conducted at the Čađavica site in August 2025.

An ideal renewable energy source

Geothermal energy is an ideal renewable energy source. It enables Croatia to use its own electricity production and thereby contributes to the country's energy independence.

Its advantage over other renewable sources is that electricity production is continuous - 24 hours a day, 365 days a year, and does not depend on weather conditions such as the amount of sun or wind. This fact makes GTE ideal for balancing the power system, which is increasingly connecting unstable RES. Namely, GTEs can decrease or increase electricity production capacity almost in real-time from 100% to 30% capacity, depending on the needs of the power system.

For the local community, GTE is an ideal investment because it occupies a very small land area (the smallest land occupancy relative to its power output, 8 times less than solar and 3.5 times less than wind).

At the same time, GTEs are the most environmentally friendly enrgy source because they do not affect the surrounding land, meaning there is no pollution or waste to be managed.

It should be particularly noted that compared to other renewable energy sources, GTE provides the largest contributions to the state and local community over the longest period, as the lifespan of the power plant is at least 40 years. Namely, they are allocated 5% of the revenue from the sale of electricity, as well as a fixed fee for land occupancy. In the specific case of GTE Zagocha, it involves annual revenues of more than 500,000 euros in the case of the state and municipality, and around 300,000 euros in the case of the county.

The director of Geo Power Zagocha is Ivana Meašić, and the manager of the construction project of GTE Zagocha is Boris Vidoš.