ePolitix: The government is to announce plans to build enough off-shore wind farms to power every home in Britain. Business secretary John Hutton is expected to announce the major expansion in renewable energy during a speech in Berlin on Monday. Up to 7,000 turbines could be installed around the UK’s coastline – more than two per mile – with the aim of producing 34 gigawatts of electricity by 2020. Currently wind is the source of only one gigawatt of power in the UK, and the …