The result is a high concentration of potential emissions-free geothermal energy, one that can form the base of a carbon-free electricity grid, unlike wind and solar power, which don’t typically generate power around-the-clock. The UFO-like Velika Ciglena geothermal plant is the first of its kind in Croatia, and backers believe the technology could eventually power much of the country’s needs, as well as in neighboring countries that have similar geology, such as Austria, Hungary and Serbia.