Enel Green Power (EGP) will sell electricity from the proposed 200MW Caney River Wind Project to Tennessee Valley Authority (TVA).
The US government-owned TVA will buy the annual output of the farm to be built and operated by EGP in Elk County, Kansas.
The entire project is expected to cost about $350m and the facility is expected to commence commercial operation in 2011.
Enel Green Power, which operates in the US through its subsidiary Enel North America, has entered into an agreement to purchase the project from Kansas-based TradeWind.
TVA provides electricity for utilities and business customers in most of Tennessee and parts of Alabama, Mississippi, Kentucky, Georgia, North Carolina and Virginia.