Eiffel tower gains wind turbines
Wind turbines have been installed on the Eiffel Tower as part of a bid to make the Paris icon more sustainable.

US-based Urban Green Energy installed two vertical axis turbines capable of delivering 10,000 kilowatt-hours of energy a year. This will effectively offset the power used by the commercial area on the first floor of the tower, which houses restaurants, exhibits and a souvenir shop.

The turbines, 400 foot above the ground, make very little noise, sit within the structure and have been painted to match the surrounding ironwork

Vertical axis turbines produce less energy than conventional ones but are used in urban areas where wind is less predictable.

A 'green retrofit' of the Eiffel Tower has also seen the installation of LED lights, a rainwater recovery system and solar panels to supply half of the hot water needs of its two pavilions.

Elsewhere in Paris, wind turbines disguised as trees have been erected in some streets.