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Clipper Windpower, a wind power company based in
California, received an "Outstanding Research and Development Partnership Award"
from the U.S. Department of
Energy (DOE) for the design and development of its 2.5 MW Liberty Wind
Turbine, the largest wind turbine manufactured
in the U.S. The turbine was developed under a partnership with DOE and its National
Renewable Energy Laboratory (NREL). Commercial sales started in June 2006
for the new Liberty turbine and now amount to more than 5,600 MW (2,240 units)
of firm and contingent orders for deliveries in 2007 through 2011.
In April, 2008 Clipper Wind announced plans to develop the World’s largest
wind energy turbine
in Blyth, Northumberland in the
United Kingdom. Being developed for Offshore use each turbine would be rated at
around 7.5MW and would be roughly double the size of the largest turbines used
in commercial offshore wind farms today (GE's 3.6MW turbine)
As reported by the British Wind Energy Association 
"as few as 20 of these turbines could satisfy the domestic consumption of a city
the size of Newcastle upon Tyne
[UK]" a city with a population of around 250,000.