major milestone

Houston geothermal startup selects Texas location for first energy storage facility

Houston startup Sage Geosystems has tapped a utility provider for an energy storage facility in the San Antonio metro area. Photo via sagegeosystems.com

Houston-based geothermal energy startup Sage Geosystems has teamed up with a utility provider for an energy storage facility in the San Antonio metro area.

The three-megawatt EarthStore facility will be on land controlled by the San Miguel Electric Cooperative, which produces electricity for customers in 47 South Texas counties. The facility will be located in the town of Christine, near the cooperative’s coal-fired power plant.

Sage says its energy storage system will be paired with solar energy to supply power for the grid operated by the Electric Reliability Council of Texas (ERCOT). The facility is set to open later this year.

“Once operational, our EarthStore facility in Christine will be the first geothermal energy storage system to store potential energy deep in the earth and supply electrons to a power grid,” Cindy Taff, CEO of Sage Geosystems, says in a news release.

The facility is being designed to store geothermal energy during six- to 10-hour periods.

“Long-duration energy storage is crucial for the ERCOT utility grid, especially with the increasing integration of intermittent wind and solar power generation,” says Craig Courter, CEO of the San Miguel Electric Cooperative.

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A View From HETI

Shell has entered a 15-year agreement to be the first offtaker to receive electrons from Fervo Energy's flagship geothermal development in Beaver County, Utah, known as Cape Station. Photo via fervoenergy.com

Beginning in 2026, Shell will be able to apply 31 megawatts of 24/7 carbon-free geothermal power to its customers thanks to a new 15-year power purchase agreement with Houston next-gen geothermal development company Fervo Energy.

“This agreement demonstrates that Fervo is stepping up to meet the moment,” Dawn Owens, VP, Head of Development & Commercial Markets at Fervo, said in a news release.

Shell will become the first offtaker to receive electrons from Fervo's flagship geothermal development in Beaver County, Utah’s Phase I of Cape Station. Cape Station is currently one of the world’s largest enhanced geothermal systems (EGS) developments, and the station will begin to deliver electricity to the grid in 2026.

Cape Station will increase from 400 MW to 500 MW, which is considered by the company a major accomplishment due to recent breakthroughs in Fervo’s field development strategy and well design. Fervo is now able to generate more megawatts per well by optimizing well spacing using fiber optic sensing, increasing casing diameter and implementing staggered bench development. This can allow for a 100 MW capacity increase without the need for additional drilling, according to the company.

With the addition of the new Shell deal, all 500 MW of capacity from Fervo’s Cape Station are now fully contracted. The deal also includes existing agreements, like Fervo’s PPAs with Southern California Edison and an expanded deal with Clean Power Alliance that adds 18 MW of carbon-free geothermal energy to the company’s existing PPA with Fervo.

“As customers seek out 24/7 carbon-free energy, geothermal is clearly an essential part of the solution,” Owens said in the release.

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