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The article reports on the potential of the Severn Barrage to produce renewable electricity as the British government gave details of its tidal energy study. It notes that the tidal barrages and lagoons will be examined in the barrage study. It mentions that the barrage could produce 5% of country's electricity. John Hutton, business secretary, said that the Severn Estuary has a tidal potential that could more than double the country's supply of renewable electricity.