Energy Storage for a Secure, Reliable Grid

Grid Scale Capacity

Delivering 500 MW (4,000 MWh) of dispatchable energy when and where it’s needed most

Advanced Compressed Air Energy Storage

Our approach is as simple as it is powerful: When excess power is available on the grid, we run it through turbines, convert it to compressed air and pump in into large underground caverns. Once in the cavern it is stored as potential energy. When the grid needs that power back, we simply reverse the process. Innovations like heat capture and hydrostatic pressure improve our efficiency and allow us to site projects where they’re needed.

Proven technology, evolved.
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Deliver up to 500MW for 8 hours or more on a compact, flexibly sited footprint
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Zero critical minerals or hazardous materials, using a simple combination of air, rock, and water
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Deploy the same labor and supply chains as natural gas and mining—tapping into a ready-made workforce
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Adiabatic compression reuses heat for efficiency, while hydrostatic control ensures stable pressure, reducing footprint and enabling flexible siting.
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Project lifetime of 50+ years, ensuring dependable long-term reliability to the grid
Learn About Our Technology

Featured projects

500 MW | 8+ hours

$500M+ USD in community benefits

Kern County, CA

200 MW | 8+ hours

$550 million (AUD) in regional economic impact

Broken Hill, NSW

500 MW | 8+ hours

$1.1 billion (CAD) in regional economic impact

Lennox & Addington County, ON

These advanced projects represent small portion of our 7-gigawatt pipeline, with projects currently in development across the United States, Canada, and Australia.

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Proven, secure and flexible energy storage.

Our technology offers distinct advantages over alternative energy storage options, providing large-scale solutions for some of the world’s biggest energy challenges.

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 50+ year lifespan.

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.

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.

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.

What’s new at Hydrostor

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Hydrostor Team

Our company

Hydrostor is a leading energy storage, technology, and infrastructure company dedicated to developing utility-scale long duration energy storage solutions. Our global team of clean energy experts is building the future of reliable, secure, carbon-free energy.

130+ Employees located around the world
4 offices in 3 countries
2 Late Stage projects in California and Australia
15+ Projects in our pipeline

Get in touch

Get in touch

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    Toronto office

    333 Bay Street, Suite 520
    Toronto Ontario M5H2R2
    Canada
    (416) 548-7880

    Denver office

    1125 17th Street, Suite 700
    Denver, Colorado 80202
    USA

    Melbourne office

    Level 10, 420 St.Kilda Road
    Melbourne, Victoria 3004
    Australia

    Adelaide office

    Tenancy 8/6 MAB Eastern Prom
    Tonsley SA 5042
    Australia