Wind turbines, computer artwork. The blades of the turbines (most designs have three blades) are turned by the wind. As the turbine blades rotate, electricity is generated in the structure mounted just behind the blades. A tall support structure (usually over 50 metres tall) allows the blades to take advantage of the wind. Many hundreds or even thousands of wind turbines can be used on a wind farm to generate power for thousands of homes. Wind power is an environmentally-friendly source of energy, as it does not release pollutants and does not rely on a limited resource (such as oil) for fuel.
© Victor Habbick Visions/Science Photo Library
circa 1911: Huge turbine engines being hoisted into position for fitting to the Cunard luxury liner 'Aquitania' during her construction at a Clydebank shipyard owned by John Brown and Company. The Aquitania took three years to build and was launched in 1914 weighing 45,647 gross tons. The last of the Atlantic four-stackers, she went on to become the longest-serving ship this century, retiring after 35 years of service which included war duty as an armed merchant cruiser, a troopship and a hospital. Shipyards dominated Clydebank and led to rapid industrial growth until demand faltered and the area's economy slumped in 1931 with unemployment levels reaching 65%. (Photo by Topical Press Agency/Getty Images)
Digital illustration of solar updraft tower, an innovative alternative energy power plant showing collectors, turbines and thermal storage
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