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 will power the forthcoming Project Kilby using natural gas. Photo via Getty Images

Chevron and Microsoft have signed a 20-year deal in which Chevron will provide natural-gas-fired power for a future West Texas data center, known as Project Kilby.

The proposed Microsoft data center could be one of the biggest in the U.S. and is expected to deliver 2.67 gigawatts of capacity. It will be built through a “phased, modular approach that enables incremental expansion over time,” according to Chevron.

Chevron expects the facility to be up and running by 2028, though the company won’t make a final investment decision on the project until later this year. The company is collaborating on Project Kilby with investment fund Engine No.1.

Project Kilby is projected to bring in $10 billion in state and local tax revenue and support 2,000 jobs, according to Chevron. The plant will use non-potable, brackish groundwater for power plant operations and aims to find new ways to reuse water produced by oil and gas operations.

The site will use selective catalytic reduction systems to reduce nitrogen oxide emissions and minimize noise and light impacts and will utilize other advanced air emissions control technologies. A majority of the generation will come from large turbines developed by Chevron partner GE Verona with additional capacity from Caterpillar’s solar turbines. The plant will be fed by natural gas from the Permian Basin.

“Chevron is uniquely positioned to deliver power to customers with certainty, speed and at a competitive cost, leveraging Permian natural gas and our proven execution capabilities,” Jeff Gustavson, Chevron president of new energies, said in a news release. “This project links Chevron’s traditional strengths to emerging demand, creating differentiated value for our shareholders and the communities where we operate.”

According to BloombergNEF, the U.S. is expected to increase its data center capacity to 77 gigawatts by 2030. Another report from Bloom Energy predicts Texas will see a 142 percent increase in its market share for data centers from 2025 to 2028.

“The rapid growth we’re experiencing in AI and cloud, driven by customer demand, requires energy infrastructure that can scale quickly and reliably,” Noelle Walsh, Microsoft president of cloud operations and innovation, added in the news release. “Our agreement with Chevron helps ensure we’ll have dedicated, large-scale power to support the evolution and reliability of advanced computers. Through this partnership, we’re delighted to grow with and become a deeper part of the West Texas community.”

Chevron was named No. 21 on the 2026 Fortune 500 list earlier this month.

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