Potential of geothermal power & What will it take?

Revealing the potential of geothermal power mainly depends on geography. Geothermal power is extremely constrained. In the U.S. there are only about five states where there is practical hot rock geothermal generation, and it is too expensive to interest investors these days. However, Iceland seems to have the world’s largest untapped geothermal potential. But Iceland gets most of its power from hydropower, and there has to be an economic reason for that.