*Wind Energy*


Wind has long been used for energy

Wind energy = energy derived from movement of air
-An indirect form of solar energy
Wind turbines = devices that convert wind’s kinetic energy into electric energy
Windmills have been used for 800 years to pump water
After the 1973 oil embargo, governments funded research and development
-Moderate funding boosted technological progress
-Today’s wind turbines look like airplane propellers or helicopters



Wind turbines turn kinetic energy to electric energy



Wind farms


Altamont Pass, California. Installed in 1970s. Almost 5000
turbines, largest wind farm in the world.


Proposed Wind Farm





Vertical Axis Wind Turbine



Wind is the fastest growing energy sector


Offshore sites hold promise




Cape Wind Project



Will generate about 75% of the average
electricity demand for Cape Cod, Martha's Vineyard,
and Nantucket island combined.






Wind power has many benefits


Wind power creates job opportunities



Wind power has some downsides

We have no control over when wind will occur
-Limitations on relying on it for electricity
-Batteries or hydrogen fuel can store the energy
Wind sources are not always near population centers that need energy
-Transmission networks need to be expanded 
Local residents often oppose them
-Not-in-my-backyard (NIMBY) syndrome
Turbines threaten birds and bats, which can be killed when they fly into rotating blades 



US wind-generating capacity