On this episode of Watt It Takes, we explore another approach to long-duration energy storage: compressed air.

Curtis VanWalleghem, Co-Founder and CEO of Hydrostor, started the company in 2010 after confronting surplus power challenges at Bruce Power. Without a traditional founder background, he set out to build storage systems that use compressed air and underground hard rock caverns to deliver ten-plus hours of grid-scale power.

What began as experiments with underwater balloons evolved into large-scale rock cavern projects and a major business model shift. Hydrostor transitioned from a technology provider to an independent power producer, securing PPAs and financing billion-dollar infrastructure projects.

In this conversation, Curtis reflects on the realities of building something capital-intensive: raising early checks from friends and family, enduring more than 200 investor rejections, mortgaging his home, pivoting both technology and strategy, and learning how to finance projects at true infrastructure scale.

Today, Hydrostor has raised over $550 million in equity, secured roughly $8 billion in revenue contracts, and is advancing a multi-gigawatt pipeline across North America and Australia.

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