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Greenflash acquires 200 MW battery storage project in Texas

Greenflash Infrastructure has finalised the acquisition of Rock Rose, a 200 MW energy storage project located in Fort Bend County, to strengthen its ERCOT market portfolio.

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Greenflash Infrastructure, a company specialising in large-scale energy infrastructure projects, has announced the acquisition of Rock Rose, a 200 MW / 400 MWh battery energy storage facility located in Texas. This pre-Notice-to-Proceed (pre-NTP) project was sold by developer Advanced Power. The asset is fully permitted and interconnection-ready, with commercial operations targeted for mid-2027.

Strategic reinforcement of the ERCOT portfolio

Rock Rose adds to Greenflash’s existing capacity in the Electric Reliability Council of Texas (ERCOT) network management zone. The project was selected for its interconnection position, transmission access, and its ability to support regional grid reliability. Greenflash is targeting the deployment of 5 GW of capacity across ERCOT, and this acquisition represents a step toward that objective.

The Rock Rose project is key to meeting increasing flexibility and grid stability needs in a region marked by strong energy demand growth. With a clear timeline in place, the project is positioned to begin service following the expected operational go-ahead in 2026.

A sale aligned with Advanced Power’s strategy

Advanced Power, the developer of the project, is continuing its strategy of technological diversification by transferring assets to operators specialised in long-term operations. Historically active in thermal and renewable energy, the company now includes battery energy storage systems (BESS) in its portfolio of power solutions.

The sale of the Rock Rose project allows Advanced Power to align with operators capable of delivering large-scale construction and long-term operation. Located in Fort Bend County, the site is strategically positioned in a grid-constrained zone.

Long-term targets for Greenflash

With this asset, Greenflash continues its focus on shovel-ready or near-execution projects. The company’s model involves securing already permitted capacity to reduce risks linked to planning and regulatory procedures. Its development strategy is fully centred on utility-scale storage in the ERCOT market, one of the most dynamic in the United States for grid flexibility.

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