Fracking for Heat: A New Source of Clean Energy?

Southern California Edison - one of America's largest power companies - will buy power from 7-year-old fracking startup Fervo, reports the Washington Post. "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... [C]onventional 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. When completed in 2028, the new enhanced geothermal plant will add 400 megawatts of carbon-free electricity to the power grid (Southern California Edison has agreed to buy 320 megawatts; the rest will go to smaller power providers.) That is less than one-fifth of the generating capacity of the Diablo Canyon nuclear power plant, which by itself provides nearly a tenth of California's electricity. But as the first power purchasing agreement between an electric utility and an enhanced geothermal company, the deal represents a milestone in the effort to limit global warming. "It's a big deal," said Fervo founder and CEO Tim Latimer. "It shows the important role that geothermal is going to play on the grid as a 24/7 carbon-free energy resource...." Fracking for heat releases no greenhouse gases. But to meaningfully contribute to emissions cuts, enhanced geothermal will need to expand quickly. The article includes an interesting statistic about the original impact of fracking. "Between 2005 and 2021, cheaper natural gas replaced so much coal that it drove a larger reduction in U.S. CO2 emissions than replacing coal with emissions-free electricity sources such as wind and solar." (Though it still emits other greenhouse gases, and "some scientists now say that so much methane leaks during fracking that natural gas warms the planet as much as coal does.") And while fracking for oil still has some strong critics, U.S. presidential candidate Kamala Harris "will not seek to ban fracking if she's elected," the Hill reported Friday, citing confirming comments from a campaign official.

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