"The tender commission determined that for five of the six exploration blocs offered, a total of 16 bids were received from 11 candidates. These are reputable domestic companies looking to diversify their portfolios with new, safe and strong energy projects," the agency said in a press release on Thursday.

The bidders also include many foreign companies with rich experience in developing geothermal energy projects, the agency added without mentioning any names.

The tender that closed earlier this week concerns an area of over 200 square kilometers (77.2 sq. miles) with a proven significant geothermal potential in the Drava river basin in four counties in Croatia's northeast and east – Međimurje, Koprivnica-Križevci, Podravina, and Osijek-Baranja.

The expected value of the investment is over EUR 400 million (USD 430 million), and the potential total energy output of the sites is estimated at over 600,000 MWh, the agency added.