The difference from Iceland is very clearly addressed a couple paragraphs into the article: > Tapping that heat, however, has proved difficult. Some nations—no

The difference from Iceland is very clearly addressed a couple paragraphs into the article: > Tapping that heat, however, has proved difficult. Some nations—notably volcanically active Iceland—siphon hot groundwater to heat buildings and generate electricity. In most places, however, the rock lacks the water or the cracks needed to easily move heat to the surface. For decades engineers have sought to coax heat from this hard, dry basement rock, which can reach temperatures of more than 250°C. But those efforts have largely failed