The rotor diameter of offshore turbines in 2030 will reach an average of approximately 240 m and 160 m onshore. For adapting a turbine to the general wind conditions at the site, manufacturers equipped machines of one rotor size with electrical generators of different capacities
The notion of using wind power dates back centuries — Jay Lehr and Jack Keeley note in the Alternative Energy and Shale Gas Encyclopedia that the Egyptians were using wind to transport goods 5,000 years ago. Windmills used by the Babylonians in 700 BCE helped with irrigation, one of the first times they were used to replace human and animal labor. At the turn of the 20th century, windmills were being used to generate electricity locally. The first megawatt-class electrical wind turbine was added to a Vermont utility grid in 1941.
