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Home - HydrostorHydrostor’s long duration energy storage technology is accelerating the integration of renewable power for a cleaner, more resilient energy future.Home - Hydrostor Contact Us a Contact Us M Home Projects Technology Company Newsroom Careers Contact Us FollowFollow Grid Scale Capacity Hydrostor’s A-CAES projects are 500 MW, large enough to provide 8 or more hours of back-up power Flexible and Adaptable Long duration storage helps the grid adjust to variable supply and demand, all from a compact, flexibly sited facility Mature Technology Next-generation compressed air solution leverages established supply chains and skilled labor markets Dedicated Professionals Our experienced team of energy professionals are building and operating projects all around the world Energy Storage for a Secure, Reliable Grid Long Duration Energy Storage Systems for the Modern Grid We use a simple combination of air, water, and underground caverns to store energy   Advanced Compressed Air Energy Storage (A-CAES) is an innovative approach to energy storage that builds on proven technology. Project Features 500 MW or 8+ hours of energy storage on a compact footprint No critical minerals or hazardous materials Facilities with a 50+ year lifetime, ensuring long-term reliability Flexible siting using purpose-built hard rock caverns – no need for salt caverns The Advanced Compressed Air Energy Storage Process A-CAES plants are designed to store off-peak or surplus electricity and via an efficient, closed loop system. There are five key steps: compression, heat exchange, air storage, water displacement, and discharge. Our Technology The Benefits of A-CAES Reliable performance Matches the reliability of thermal power plants, but with an emissions-free process. Flexible siting Purpose-built hard-rock caverns can be built where the grid needs support most, unlike traditional CAES or pumped hydro. Essential grid services Rotational inertia from spinning motors keeps the grid stable. Other ancillary services include voltage support, spinning reserve, black start, and frequency response. Cost-effective with a long life Low installed costs per kWh over a facility’s 50+ year lifespan. Significant economic benefits Creates high-quality jobs for skilled trades, enforcing regional infrastructure and boosting local industry. Customized, adaptable system design Scalable system is designed to match grid requirements. Incremental capacity and duration increases can be added in the future with limited downtime and low marginal cost. Reliable performance Matches the reliability of thermal power plants, but with an emissions-free process. Cost-effective with a long life Low installed costs per kWh over a facility’s 50+ year lifespan. Flexible siting Purpose-built hard-rock caverns can be built where the grid needs support most, unlike traditional CAES or pumped hydro. Significant economic benefits Creates high-quality jobs for skilled trades, enforcing regional infrastructure and boosting local industry. Essential grid services Rotational inertia from spinning motors keeps the grid stable. Other ancillary services include voltage support, spinning reserve, black start, and frequency response. Customized, adaptable system design Scalable system is designed to match grid requirements. Incremental capacity and duration increases can be added in the future with limited downtime and low marginal cost. Featured Projects Explore our projects in various stages of development around the world. 500 MW | 8+ HRS Kern County,California, USA 200 MW | 8+ HRS Broken HillNew South Wales, AUS 500 MW | 8+ HRS Lennox & Addington CountyOntario, CAN 500 MW | 8+ HRS Phoenix Metropolitan AreaArizona, USA 500 MW | 8+ HRS WellingtonNew South Wales, AUS ❮ ❯ Recent News & Insights INSIGHTS Mar 10, 2026 Leading Global Companies Back Hydrostor’s Compressed Air Energy Storage Technology PRESS RELEASE Feb 25, 2026 Hatch and Hydrostor announce strategic execution partnership and equity agreement to deliver advanced compressed air energy storage INSIGHTS Feb 23, 2026 Deploying 7 GW of Energy Storage Around the World PRESS RELEASE Feb 12, 2026 Hydrostor’s Willow Rock Energy Storage Center Signs Offtake Agreement with California Community Power All Articles Our Company Learn more about our team of dedicated energy professionals.  130+ Employees located around the world  4 Offices in 3 Countries  2 Late Stage Projects In California and Australia  1 commercial contracted facility operating in Canada  15+ Projects In Our Pipeline Our Team and Story Join our newsletter to stay up to date on news and announcements Success! Email Home Projects Technology Company Newsroom Careers Contact Us Media Kit Follow Us  LinkedIn  YouTube © 2026 – Hydrostor Terms of Use Privacy Policy AB1305 Subscribe To Our NewsletterJoin our mailing list to receive the latest news and updates from our team. SUBSCRIBE! You have Successfully Subscribed!enusen-US1775487121https://hydrostor.ca