The world's biggest offshore wind farm has been officially opened by the Prime Minister.
The London Array is situated 12 miles off Clacton in Essex. The £1.8 billion windfarm covers 95 square miles and can create enough energy to power three quarters of the homes in Essex.
The project is being hailed as good for jobs, particularly after claims the East could produce up to 75% of the country's energy supply in the future.
But there are some that say it's not so good for taxpayers, with critics claiming green energy will cost each household more than £600 a year by 2020.
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It will be a cold and clear night with a widespread frost away from the coast as temperatures dip to -2 deg C.