![An artist's impression of United Utilities' new floating solar power system](http://i.telegraph.co.uk/multimedia/archive/03482/Godley-CGI_3482892b.jpg)
The 12,000 panel, £3.5m development will be only the second of its kind in Britain, dwarfing an 800-panel pilot in Berkshire last year, and will be the second biggest in the world after a scheme in Japan.
Installation of the panels is due to begin on Monday at the Godley reservoir in Greater Manchester, where it will provide a third of the power for a water treatment works.
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