Well for any animal thriving and overpopulating it can cause lack of food, damaged ecosystems, and disease.
Specifically the cane toad thriving and overpopulating can cause death from their toxins and sense they are one of the biggest toads, they can effect bigger animals and even humans, lowering the population of another species and damaging an ecosystem.
It is best to build the power plant as close to a volcano as possible. That’s where the Earth’s crusty mantle is at is thinnest, which means engineers don’t have to dig so deep to get to the heat for geothermal energy. This is efficient
