This system stores and generates energy using a buoyant object, like a balloon, submerged in water. A motor pulls the balloon down against its natural tendency to rise, storing energy. When energy is needed, the balloon is released to rise, pulling a tether connected to a reel, which turns a generator to produce electricity.
Why it matters: Since 2009, advancements in marine-grade materials and automated control systems could significantly improve the durability and energy conversion efficiency of such a system.
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