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

Chevron plans to launch its first AI data center power project in West Texas in 2027. Photo via Chevron.com

Two of the Houston area’s oil and gas goliaths, Chevron and ExxonMobil, are duking it out in the emerging market for natural gas-powered data centers—centers that would ease the burden on electric grids.

Chevron said it’s negotiating with an unnamed company to supply natural gas-generated power for the data center industry, whose energy consumption is soaring mostly due to AI. The power would come from a 2.5-gigawatt plant that Chevron plans to build in West Texas. The company says the plant could eventually accommodate 5 gigawatts of power generation.

The Chevron plant is expected to come online in 2027. A final decision on investing in the plant will be made next year, Jeff Gustavson, vice president of Chevron’s low-carbon energy business, said at a recent gathering for investors.

“Demand for gas is expected to grow even faster than for oil, including the critical role gas will play [in] providing the energy backbone for data centers and advanced computing,” Gustavson said.

In January, the company’s Chevron USA subsidiary unveiled a partnership with investment firm Engine No. 1 and energy equipment manufacturer GE Vernova to develop large-scale natural gas power plants co-located with data centers.

The plants will feature behind-the-meter energy generation and storage systems on the customer side of the electricity meter, meaning they supply power directly to a customer without being connected to an electric grid. The venture is expected to start delivering power by the end of 2027.

Chevron rival ExxonMobil is focusing on data centers in a slightly different way.

ExxonMobil Chairman and CEO Darren Woods said the company aims to enable the capture of more than 90 percent of emissions from data centers. The company would achieve this by building natural gas plants that incorporate carbon capture and storage technology. These plants would “bring a unique advantage” to the power market for data centers, Woods said.

“In the near to medium term, we are probably the only realistic game in town to accomplish that,” he said during ExxonMobil’s third-quarter earnings call. “I think we can do it pretty effectively.”

Woods said ExxonMobil is in advanced talks with hyperscalers, or large-scale providers of cloud computing services, to equip their data centers with low-carbon energy.

“We will see what gets translated into actual contracts and then into construction,” he said.

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