Dig very deep, and you will find enough geothermal energy to power the world

"Geothermal energy plants today generate fairly limited energy, but that may be because they only channel heat from around 200 meters underground. The earth is much hotter further down, according to several Norwegian companies and ExxonMobil, who are all planning drilling installations that will tap 5,500 meters to 10,000 meters or more underground. Norwegian-based SINTEF says that just a fraction of the heat energy encased at those depths would suffice to power the entire world."

Magazine "The Futurist"