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Sinking Giant Concrete Orbs to the Bottom of the Ocean Could Store Massive Amounts of Renewable Energy
These underwater batteries could potentially store hundreds of thousands of gigawatt-hours.
Traditional versions involve pumping water uphill into a reservoir, then releasing it downhill to generate electricity when needed from its massive potential energy. From the fjords of Norway to the coastlines of Japan, from the U.S. East Coast to the Portuguese shelf, the team has mapped numerous ideal sites: locations between 600 and 800 meters deep, where pressure, concrete strength, and existing pump designs strike an economical balance. These installations could play a key role in energy arbitrage — buying electricity when it’s cheap and storing it to sell when prices rise — or in providing ancillary services to stabilize an increasingly complex grid.
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