Like old fashioned windmills, modern wind machines use blades to collect the wind’s kinetic energy
Basic design developed by Persians 800 A.D.
Early use to pump water and grind grain
As the wind flows over the wing- shaped blades, lift causes the blades to turn
The blades are connected to a drive shaft that turns an electric generator to produce electricity
The Basics – Part Two Large wind turbines generate enough electricity for 600 homes 3.1 Usually placed in high wind areas in tens and sometimes in hundreds Vertical windmills generate 50% more electricity than horizontal windmills
World Wind Energy At the end of 2007, worldwide capacity was 94.1 gigawatts About one percent of world-wide electricity Fivefold increase between 2000 and 2007 On one windy morning in March, 2009, Spain produced 40 percent of its electrical demand with wind Global wind capacity grew 29% in 2008, and U.S. surpassed Germany to lead world in generating wind power 4.1 Wind power produces about 1.5% of worldwide electricity use
T housands of wind turbines currently in operation with a total capacity (2008) of 121,188 MW
Wind power in Europe accounts for 55% of the use
81% of wind power installations are in the US and Europe
The UK is building a 90 square mile (the “London Array”) offshore wind farm with 175 turbines producing 630 megawatts (MW) seven miles off the coast of Kent
A Stage Two ups the plan to 341 turbines and 1 gigawatt (GW) of power, enough for a quarter of all the homes in Greater London and by far the biggest off shore development in the world 5.1
U.S. Wind Energy After two decades, U.S. wind industry hit 10,000 megawatt capacity mark in 2006 By 2008, capacity doubled again to 27,000 megawatts Enough electricity to serve 7 million American homes or power a fleet of more than 1 million plug-in hybrid vehicles Enough energy to replace 28.7 million tons of coal or 90 million barrels of oil About 42% of all the new power-producing capacity completed in 2008
Wind Map of the U.S. Fair Good Excellent Outstanding Superb At the end of the third quarter of 2008, the states with the most cumulative wind power capacity installed are: Texas, with 6,297 MW; California, with 2,493 MW; Iowa, with 1,394 MW; Minnesota, with 1,377 MW; and Washington with 1,367 MW.