GridStor acquires another 300 MWh Texan big battery project

The Goldman Sachs-backed developer has acquired 450 MW/1.5 GWh of battery energy storage system (BESS) capacity across three US projects since mid January.
ERCOT expects a 50% rise in peak electricity load demand across its grid by 2030. | Image: jplenio/Pixabay

Oregon-based energy storage developer GridStor has continued its 2025 acquisition spree by purchasing a 150 MW/300 MWh BESS project from Balanced Rock Power.

Goldman Sachs-backed GridStor bought a 200 MW/800 MWh, Southern Power Pool grid-connected BESS in eastern Oklahoma from Texas-based Black Mountain Energy Storage in mid January. Less than a fortnight later the developer announced the acquisition of a 100 MW/400 MWh BESS in Arizona from Los Angeles-based Capacity Power Group.

The developer has now expanded its energy storage footprint again with the Balanced Rock Power acquisition, which relates to a site in Hidalgo County, Texas.

Announcing the latest investment, GridStor said the project is set to be operational in summer 2026 and will generate more than 100 construction jobs.

The BESS will bolster the Lower Rio Grande Valley region of the Electric Reliability Council of Texas (ERCOT) grid. GridStor reported ERCOT, which has 8 GW of energy storage capacity on its network already, is expecting peak electricity load across its grid to rise 50% by 2030. Reports have indicated large energy demand coming online and projected from AI-focused data centers being built across the US, with Texas a key focus area for the promised $500 billion AI data-center Project Stargate plan.

The latest purchase is GridStor’s second from Utah-based Balanced Rock, with the Hidden Lakes BESS, in Galveston County, Texas, under construction and due online on the ERCOT grid by this summer.

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