GridStor, a developer and operator of utility-scale battery energy storage systems, has partnered with Switzerland-based energy company Axpo to execute an Energy Storage Agreement for the Hidden Lakes Reliability Project in Galveston County, Texas. The project, with a capacity of 220 MW / 440 MWh, became operational in the fourth quarter of 2025.
Project Overview and Agreement Scope
The deal is meant to make prices more stable for people who use electricity, especially in the Houston area. A 100 MW custom agreement, backed by the Hidden Lakes battery storage facility, is a key part of the deal.
- Project capacity: 220 MW / 440 MWh
- Location: Galveston County, Texas
- Operational since: Q4 2025
- Agreement size: 100 MW
This structure enables Axpo to deliver predictable electricity pricing to retail customers while leveraging GridStor’s storage capabilities.
Enhancing Pricing Stability and Market Innovation
The partnership is a big step toward coming up with new, affordable ways to store batteries for projects. The partnership helps keep electricity rates stable for businesses and homes by structuring the agreement in a way that effectively handles price risks.
Chris Taylor, CEO of GridStor, said, “We are proud to work alongside Axpo to support long-term pricing predictability for Houston residents and businesses.”
He added that the bespoke transaction structure helps unlock financing for battery storage while contributing to stable retail electricity prices.
Lance Titus, Chief Commercial Officer at GridStor, noted that the agreement marks a major advancement in risk management solutions within the energy storage sector and sets a precedent for future transactions.
Strategic Collaboration and Market Expansion
Axpo highlighted the importance of tailored energy solutions in meeting customer needs. Shimon Schaff, Origination Director at Axpo U.S., stated that the company aims to help customers achieve desired energy risk profiles through customised offerings and looks forward to expanding its collaboration with GridStor in the ERCOT market and beyond.
Company Portfolio and Growth Outlook
GridStor, backed by Goldman Sachs Asset Management, currently manages:
- 530 MW / 1,300 MWh of battery storage assets (operational and under construction)
- Over 3 GW pipeline of late-stage projects across the U.S.
The company focuses on providing utilities, data centers, and industrial customers in areas with a lot of demand with energy storage solutions that are cost-effective.
Axpo Group, headquartered in Switzerland, continues to expand its presence in the U.S. by offering energy supply and risk management solutions.
The agreement underscores the growing role of battery energy storage in stabilising electricity markets and enabling flexible, reliable power systems, particularly in regions with increasing energy demand.
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