By Harry Stevens, The Washington Post, July 18, 2024
Southern California Edison, one of the country’s largest power companies, has just announced a deal to buy electricity from a seven-year-old start-up called Fervo Energy. Like other energy companies, Fervo will use hydraulic fracturing, or “fracking,” to tap an energy source trapped deep underground.
But instead of oil and gas, Fervo is hunting heat, a more abundant resource that neither pollutes the air nor contributes to global warming. The heat will fuel a new type of power plant: an enhanced geothermal plant.
Most power plants work by converting a turbine’s rotating energy into electricity. Many of the world’s energy challenges stem from this seemingly simple problem: how to get a turbine to keep spinning.
In contrast, conventional geothermal power plants capture steam from natural underground hot springs in places such as Iceland or the Geysers in Northern California. These require a rare combination of geologic conditions — heat, underground water and porous rock.
Enhanced geothermal plants use technology pioneered by oil and gas drillers to reproduce the conditions of a conventional geothermal well. This makes it possible to extract heat in many more places.
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