Today, typical geothermal wells are about 2.5 km in depth, produce steam at about 300 degrees Celsius and generate about 4-7 megawatts (MW) of electricity. In Iceland, a project is underway to drill almost twice that deep and potentially produce almost ten times that much energy.

It is estimated that producing steam from a well penetrating a reservoir hotter than 450 degrees Celsius -- at a rate of 0.67 cubic meters (24 cubic feet) per second could be enough to generate 40-50 MW of electricity.