Providing grid-scale electricity storage by storing renewable energy as compressed air

Hydrostor is a leader in Advanced Compressed Air Energy Storage (A-CAES), a technology uniquely suited to enable the transition to a cleaner, more reliable electricity grid. A-CAES helps address electricity system needs for dispatchable capacity, renewable integration and optimization, transmission deferral and ancillary services, and is ideal for use in behind-the-meter or remote applications for mines and large industrial operations. Hydrostor’s solution delivers low-cost, long duration bulk energy storage (hundreds of MWs, 4-24+ hours) that is synchronous and emission-free, and can be flexibly located, including the ability to replace retired fossil fuel plants. The proprietary technology is now the leading low-cost bulk energy storage solution – at half the cost of lithium ion batteries and 10x the lifespan. Hydrostor has multiple projects in operation or under construction in Australia and Canada, as well as numerous projects in advanced development globally. 


Clean Energy Infrastructure Sustainable Cities

Toronto, Ontario, Canada


Curtis VanWalleghem

Curtis VanWalleghem (Co-Founder & CEO at Hydrostor) has been an Unreasonable Fellow since October 2018 after participating in Unreasonable Impact Americas 2018.

Unreasonable Impact Americas 2018

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