The future of wind energy could involve huge blades spanning half a kilometre that generate compressed air – which is then piped into giant, underwater balloons. That is the dream of Seamus Garvey, a mechanical engineer at the University of Nottingham in the UK, who envisages using the pressurized air to inflate the underwater balloons, nestling about 500 m below the surface of the sea. Electricity could then be generated by releasing the air to drive a set of turbines.
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