Project Management Institute

Underwater energy

a Canadian project team looks at giant underwater balloons to store excess power from the grid

About 60 meters (197 feet) below the surface of Lake Ontario, Canada, six giant balloons are storing energy -- and potentially reducing Toronto's reliance on fossil fuels. The balloon project sponsored by Canadian energy startup Hydrostor Inc. converts electrical energy into compressed air and sends it through a 2.5-kilometer (1.6-mile) pipe underwater to the coated-nylon balloons. The six three-story balloons, anchored by 30 straps apiece, together take up the equivalent of a basketball court.
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