Geothermal energy may be approaching its Mitchell moment. George Mitchell, a scrappy independent oilman, is known as the father of fracking. Nearly three decades ago, he defied Big Oil and the conventional wisdom of his industry by making practical the hitherto uneconomic technique of pumping liquids and sands into the ground to force out gas and oil from shale rock and other tight geological formations. The enormous increase in productivity that resulted, known as the shale revolution, has transformed the global hydrocarbon business.
Now Fervo Energy, another scrappy Texan upstart, is applying such hydraulic fracturing—alongside other techniques borrowed from the petroleum industry—to the sleepy geothermal sector. Should it succeed, it would mean this relatively fringe source of energy could, in time, become a major player in the energy mix.
The motivation behind geothermal energy is to harness Earth’s abundant subsurface heat for useful ends. This is ordinarily done by tapping into underground reservoirs of hot water or steam. As these are only found in limited areas, this greatly limits the potential of conventional geothermal power. In contrast, “enhanced geothermal systems” (EGS), like the one deployed by Fervo, use hydraulic stimulation to create channels in hot rocks just about anywhere. One well pumps in water into those channels, where it is heated naturally to 200°C or higher. Another well then brings that hot water to the surface, where it is used to generate electricity in a turbine….
Geothermal energy is usually harvested by tapping into underground reservoirs of hot water or steam. These are only found in limited areas, this greatly limits the potential of conventional geothermal power.
— The Economist (@TheEconomist) September 15, 2024
There has been a hot-rocks breakthrough https://t.co/5VDAvYpUIq 👇
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