Hatch and Hydrostor partner to deliver advanced compressed air energy storage

February 25, 2026
Hatch and Hydrostor announce strategic execution partnership

DENVER, Colo. – Hatch, a global leader in engineering, project delivery, and professional services, and Hydrostor, a leading long-duration energy storage (LDES) developer and operator, have announced a new strategic project execution partnership and equity investment. Through this agreement, Hatch will lead the design and execution of the Willow Rock Energy Storage Center.

"Advancing a reliable and resilient energy system is more important than ever. Through our alignment with Hydrostor, we are bringing forward what we view as the best-in-class long-duration storage technology needed to reinforce global grid reliability for decades to come," said Jim Sarvinis, Global Managing Director, Energy, Hatch. "With a track record in complex energy innovation projects, we are driving momentum as committed stakeholders enabling a modern grid."

"We are pleased to announce this partnership with Hatch, which pairs Hydrostor’s leading long-duration energy storage technology with Hatch’s highly successful track record in delivering complex infrastructure projects," said Tom Duckett, Hydrostor’s Chief Development Officer. "Willow Rock is going to be a key reliability asset in California as electricity demand grows, and we look forward to working toward groundbreaking this year."

Beth Summers, Chief Financial Officer at Hydrostor, said, "The equity agreement signals not only Hatch’s confidence in A-CAES technology, but also in Hydrostor as a business. Hatch joins an impressive list of leading equity investors in Hydrostor, and we are excited to work hand-in-hand with Hatch as we continue to grow our pipeline of projects globally."

Willow Rock is a 500 MW Advanced Compressed Air Energy Storage (A-CAES) facility currently in late-stage development in California and has received final permitting approvals from the California Energy Commission. Designed to deliver 4,000 megawatt hours (MWh) of energy, it will be capable of providing eight hours of clean, reliable power on a full charge, offering vital long-duration storage for a modernized grid. As the largest A-CAES project in the world, Willow Rock demonstrates Hydrostor’s scalable technology.

This partnership reflects a shared commitment to delivering transformative energy solutions. Hydrostor’s proven A-CAES technology provides a strong technical foundation, while Hatch’s investment, combined with its deep project execution experience, regulatory insight, and delivery agility, will help meet rising demand for bankable long-duration energy storage.

The Willow Rock Energy Storage Center is poised to be the largest A-CAES project in the world, marking a significant step forward in building the long-duration storage essential for a resilient power grid.

 

For more information, please contact:
Lindsay Janca
Global Director, Public Relations
Tel: +1 905 403 4199
Email: media@hatch.com


About Hatch

Hatch is a global engineering, project delivery, and professional services firm. Whatever our clients envision, our teams can design and build. With seven decades of business and technical experience in the energy, mining, and infrastructure sectors, we understand that challenges are changing rapidly. We respond quickly with solutions that are smarter, more efficient, and more innovative. With 11,000 staff in over 150 countries, we challenge the status quo and create positive change for our clients, our employees, and the communities we serve.

Learn more at: https://www.hatch.com/About-Us


About Hydrostor

Hydrostor is a leading developer and operator of long-duration energy storage systems, leveraging a proven, patented technology that stores energy using compressed air and water.

Founded in 2010, with offices in Toronto, Canada; Melbourne, Australia; and Denver, USA, Hydrostor is backed by Goldman Sachs Alternatives, CPP Investments, Canada Growth Fund, and other forward-thinking institutional investors. The company has an extensive pipeline of A-CAES projects across North America, Australia, and Europe, supporting evolving grid and reliability needs.

To learn more, visit: https://www.hydrostor.ca or follow us on LinkedIn.