FlexGen and SMT Commission 320 MWh Battery in ERCOT in Six Weeks
The Houston IV system, rated at 160 MW, came online as Texas demand hit historic highs, compressing the typical industry timeline to one third.
Developer SMT Energy and integrator FlexGen brought the Houston IV energy storage system, rated at 160 MW and 320 MWh, into commercial operation in six weeks, one third of the original schedule. The installation, connected to the grid of the Electric Reliability Council of Texas (ERCOT), went live on September 9 as state demand reached historic highs.
The hourly peak ERCOT recorded on July 22, 2026 was 91.1 GW, 6% above the previous record of 85.5 GW from August 2023, according to the U.S. Energy Information Administration (EIA). During that hour, 48% of generation came from natural gas and 32% from solar. The project is backed by $135 million in financing that SMT closed in February 2025, with Irby Construction as the engineering, procurement and construction (EPC) contractor and CenterPoint Energy as the interconnecting utility, according to Energy-Storage.news. Houston IV joins more than a dozen projects from both firms in ERCOT, totaling more than 300 MW. For developers operating in northern Mexico, the ERCOT market serves as a benchmark for pricing and ancillary services.
The metric reshaping the calculus is not installed capacity but the time between financial close and energization. FlexGen attributes the outcome to a commissioning process using pre-configured, lab-tested equipment, supported by a remote operations center. In the first quarter of 2026, utility-scale battery storage in the United States surpassed 50 GW, with ERCOT contributing approximately 3 GW of the additions, the largest regional block, according to S&P Global. Houston IV's two-hour duration targets the afternoon ramp, the window of greatest price volatility in the Texas market. For battery operators in Mexico negotiating ancillary services with the Centro Nacional de Control de Energía (CENACE), the reference is twofold: cost per MW and speed of commissioning.
The next checkpoint is ERCOT's winter season and the additions that materialize from its interconnection queue, where two-hour projects compete for ancillary services contracts. The comparison with commissioning cycles reported by developers in Mexico is the figure to watch at the next capacity auction.
This article was drafted with the assistance of artificial intelligence from verified sources and reviewed by a human editor before publication.
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This article was drafted with AI assistance from verified sources and reviewed by a human editor before publication.