Boat at giant solar farm
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How London's giant floating solar farm was put together

22 March 2016 Last updated at 07:52 GMT

With 23,000 panels covering an area the size of eight football pitches, Europe's biggest floating solar farm has begun generating power for the very first time.

It is located on a reservoir south west of London, and can produce power equivalent to the demand from 1,800 homes.

John Maguire reports.