Page last updated at 08:39 GMT, Wednesday, 15 July 2009 09:39 UK

Building a wind farm out at sea

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How do you build a wind farm out at sea?

With the government announcing a major push to develop wind power off Britain's coasts, environment correspondent David Shukman visits Gunfleet Sands, the site of a major new project in the Thames Estuary where 48 turbines are being built.

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