A Utah geothermal project just landed what its developers call the world’s largest geothermal power purchase agreement. Fervo Energy has signed a 15-year contract with Southern California Edison to deliver 320 megawatts of clean, baseload electricity — enough to power around 350,000 homes — from its Cape Station facility in Beaver County, Utah.
At a glance
- Enhanced geothermal systems: Fervo uses horizontal drilling techniques borrowed from the oil and gas industry to push water through hot rock at depth, collecting the resulting steam to drive surface turbines — a method that works far beyond traditional geothermal zones.
- Cape Station capacity: The 400-megawatt plant in southwest Utah will begin delivering its first 70 MW to the California grid in 2026 C.E., with the remaining capacity coming online in 2028 C.E., bringing total contracted power to 373 MW.
- Geothermal power growth: The U.S. Department of Energy estimates that domestic geothermal energy could expand by a factor of 20 by 2050 C.E., making deals like this one early signals of a much larger shift.
Why this deal matters for clean energy reliability
Solar and wind have driven remarkable progress in decarbonizing electricity grids — but both are weather-dependent. When the sun doesn’t shine and the wind doesn’t blow, grids need something else to lean on. Geothermal heat is always there, steady and deep, unaffected by the season or the forecast.
That’s exactly what California had in mind when its Public Utilities Commission issued a 2021 C.E. mandate to procure 1,000 MW of “non-weather-dependent, non-battery, zero-emission energy.” The Fervo-Edison contract is a direct response to that mandate.
“Enhanced geothermal systems complement our abundant wind and solar resources by providing critical baseload when those sources are limited,” said California Energy Commission Chair David Hochschild. “This is key to ensuring reliability as we continue to transition away from fossil fuels.”
From pilot plant to major utility contract
Fervo’s rise has been fast. The company’s Project Red pilot plant in Nevada — funded in part by Google — began supplying power to the tech giant’s data centers in late 2023 C.E. That proved the model worked at small scale. Then, in early 2024 C.E., Fervo announced drilling improvements that cut timelines by 70% and costs by 50% compared to 2022 C.E. baselines.
The Cape Station project is now the company’s big leap. Located in a geologically favorable stretch of southwest Utah, it is designed to run at 400 MW total capacity — making it one of the largest geothermal plants ever planned in the United States.
“Geothermal stands as the dependable and adaptable solution essential for California’s journey towards a fully decarbonized grid,” said Fervo’s Dawn Owens. “As electrification increases and climate change burdens already fragile infrastructure, geothermal will only play a bigger role in U.S. power markets.”
Opening up geothermal beyond Iceland and New Zealand
Traditional geothermal power has always required a lucky geography — places like Iceland, Kenya, or New Zealand, where volcanic heat sits close to the surface. That’s limited geothermal’s global footprint for decades.
Fervo’s horizontal drilling method changes the math. By adapting fracking-era technology to circulate water through deep rock formations, the company can generate usable heat in places where vertical drilling would never reach hot enough temperatures. That opens geothermal up to a much wider swath of the American West — and, in theory, to regions around the world where conventional geothermal was never viable.
The U.S. Department of Energy’s Enhanced Geothermal Systems program has been investing in exactly this kind of technology, and Fervo’s commercial success gives that research a major proof point.
Still early, still imperfect
Enhanced geothermal systems do carry open questions. The hydraulic fracturing techniques involved have raised concerns about induced seismicity in some contexts, and large-scale water use in arid western regions warrants ongoing scrutiny. The technology’s 20-fold growth potential is a projection, not a guarantee — and scaling from hundreds of megawatts to hundreds of gigawatts will require sustained investment, regulatory support, and continued cost reduction.
Still, a 15-year, 320-megawatt contract from a major U.S. utility is the kind of commercial signal that moves an industry. It tells project developers, equipment suppliers, and financiers that enhanced geothermal power is no longer a research curiosity — it’s a procurement option. That shift in perception may matter as much as the megawatts themselves.
For a grid that needs reliability as much as it needs renewables, geothermal may be the missing piece that lets clean energy work around the clock — not just when the weather cooperates. As California’s grid operator contends with hotter summers and higher peak demand, contracts like this one are part of how the state plans to keep the lights on without burning fossil fuels to do it.
Read more
For more on this story, see: New Atlas
For more from Good News for Humankind, see:
- Renewables now make up nearly half of global power capacity
- Ghana expands its marine protected area at Cape Three Points
- The Good News for Humankind archive on renewable energy
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