As the world pivots away from fossil fuels and towards a sustainable future, one intriguing option is geothermal energy. By using fracking techniques developed by the oil and gas companies, companies are able to harvest heat from the Earth to power generators connected to the power grid. Geothermal energy is a nearly unlimited power source; according to scientists at Fervo Energy, there is enough geothermal energy in the United States alone to power the country several times over.