GridStor, a developer and operator of utility-scale battery energy storage systems, announced the execution of a tolling agreement with a Fortune 500 company for the Gunnar Reliability Project on December 16, 2025. The 150 MW, 300 MWh battery facility is located in Hidalgo County, Texas, and construction has commenced with operations expected to begin by the end of 2026.

Project Details and Timeline

The Gunnar Reliability Project represents a significant investment in Texas's energy infrastructure. The facility will provide 150 MW of power capacity and 300 MWh of energy storage. Construction has already begun, with the project timeline targeting operational status by the end of 2026.

Chris Taylor, CEO of GridStor, emphasized the project's importance amid rapidly rising power demand. “At a time of rapidly increasing power demand, battery energy storage helps ensure affordable, reliable power to households and Lower Rio Grande Valley businesses,” Taylor stated. “We are proud to increase our commitment to building battery storage facilities that help Texas sustain its historic economic expansion and deliver cost-effective power.”

Economic Impact and Employment

During the construction phase, the Gunnar Reliability Project is expected to sustain over 100 jobs, including positions for skilled tradespersons and apprentices. This employment impact will provide economic benefits to the local Hidalgo County area throughout the development period.

Once operational, the facility will have the capacity to provide power equivalent to serving 95,000 average Texas households during the hours of greatest demand on the electric grid. This capacity will increase the resilience of the Lower Rio Grande Valley region of the ERCOT power system.

Texas Energy Market Context

The project comes at a time of significant growth in Texas's energy sector. The Electric Reliability Council of Texas (ERCOT) forecasts a more than 50% increase in the state's peak load by 2030, driven by rapid growth in power demand from large industrial customers. Over 12,000 MW of battery energy storage has been deployed on the ERCOT power system to date.

GridStor's Expanding Portfolio

The Gunnar Reliability Project will represent GridStor's second operating battery energy storage system facility in Texas. The company's Hidden Lakes Reliability Project, a 220 MW battery energy storage facility in Galveston County, Texas, commenced operations earlier this year.

GridStor is backed by Goldman Sachs Asset Management and manages a pipeline of over 3 GW of battery storage projects in later-stage development or under construction across the western and central United States. The company focuses on executing and delivering projects that provide cost-effective, near-term solutions to utilities, data centers, and other large industrial customers in regions with rapidly growing energy demand.

Goldman Sachs Asset Management operates as the primary investing area within Goldman Sachs, delivering investment and advisory services across public and private markets. The firm oversees approximately USD 3.5 trillion in assets under supervision as of September 30, 2025. Goldman Sachs Asset Management is described as a leading investor across fixed income, liquidity, equity, alternatives, and multi-asset solutions.

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