As stated by the U.S. Department of Energy:
On December 18, Congress voted to approve the Consolidated Appropriations Act of 2016, which includes a 5-year extension of the wind energy Production Tax Credit (PTC). President Obama signed the legislation. As a result, the wind energy PTC will now be extended for 2015 and 2016. The credits will continue in 2017 at 80% of present value, in 2018 at 60%, and in 2019 at 40%. Wind projects will qualify if developers begin construction before the end of the designated period. The PTC pays 2.3 cents per kilowatt-hour during the first 10 years of a wind project’s operation, and the alternative ITC is worth up to 30% of a wind project’s development costs. Historically the PTC and ITC have been important drivers of wind energy development. Note that the ITC will not be available for “small wind” projects after 2016 (defined as projects up to 100 kilowatts in capacity), although other technologies (for example, solar PV) will continue to receive the credit.
Congress Passes Extension of Production Tax Credit, Investment Tax Credit. (2015, December 18). Retrieved from http://apps2.eere.energy.gov/wind/windexchange/filter_detail.asp?itemid=5473