by David Sassoon -
Jan 21st, 2008 
It was a banner year for wind energy in 2007: 45% growth in a single year.
The American Wind Energy Association announced the industry "shattered all its previous records" by installing 5,244 megawatts (MW) of new capacity and "injecting an investment of over $9 billion into the economy."
The U.S. wind power capacity now totals 16,818 MW, spans 34 states, will generate an estimated 48 billion kilowatt-hours (kWh) of energy in 2008 -- equivalent to just over 1% of U.S. electricity supply, powering the equivalent of over 4.5 million homes.
The trajectory of recent expansion, though, will be slowed unless Congress acts to extend the Production Tax Credit (PTC) which is now set to expire at the end of the year.
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