The largest battery storage project in Texas is SMT Ironman Battery Storage Plant as of February 2026. Their total operating capacity is 12,740 MW. Texas is served by ERCOT, which operates as the region's. . Houston, United States, January 13 2025 - Plenitude, through its subsidiary Eni New Energy US, has completed the construction of the Guajillo plant, the company's largest battery storage system ever. Located in the in Webb County, Southwest Texas, about 20 kilometers from the city of Laredo. . Located in Hunt County, TX, the Cunningham BESS is ACCIONA Energía's flagship energy storage project. The project is ACCIONA's sixth investment in the State of Texas, joining the Fort Bend Solar Farm, Red-Tailed Hawk Solar Farm and the La Chalupa, San Roman and Palmas wind farms in Cameron County. . The 300 MWh Revolution energy storage facility was completed in one year—on schedule and within budget.
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