Queen Elizabeth Uses Green Hydroelectricity to Power Windsor Castle

The Queen has given the green light to power Windsor Castle by hydroelectricity, using two giant turbines.

The 40-ton Archimedes Screws were lowered into place by crane at Romney Weir on the River Thames, within sight of her favorite royal residence...

Source:
http://www.dailymail.co.uk/sciencetech/article-2034945/Queen-Elizabeth-uses-green-hydroelecricity-power-Windsor-Castle.html