The Production Tax Credit for wind energy was extended through 2013 as part of the deal congress and the Obama Adminstration reached on the fiscal cliff. The PTC was given a 1-year extension, though a crucial change will allow all projects that begin construction in 2013 to receive the tax credit of 2.2 cent per kilowatt hour. Previously, a project was required to be completed and in operation to qualify for the PTC. 

Read more about the PTC extension here.