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From BBC News | Science/Nature | UK Edition:
Details of a feasibility study into the Severn Barrage, a tidal power plan that could provide about 5% of UK electricity, are announced.
The government said the scale of the project and the impact it could have on securing energy supplies and tackling climate change was "breathtaking".
The study will also look at lagoons, and the social, environmental and economic impacts of all the proposals.
The barrage could extend from the South Wales coast to Weston-super-Mare.
It would harness the power of this estuary using a hydro-electric dam, but filled by the incoming tide rather than by water flowing downstream.
The study is expected to last two years and will conclude with a full public consultation in 2010.
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