The wind facility features 100 Vestas-built V110-2.0MW turbines.
Duke Energy Renewables president Greg Wolf said: "The Los Vientos III Windpower Project achieving commercial operation represents a significant milestone for Duke Energy Renewables, as we now have more than 2,000MW of renewable energy in production."
As part of a 25-year agreement, Austin Energy will purchase the power and associated renewable energy from the project.
Austin Energy general manager Larry Weis said: "The completion of Los Vientos III means that Austin Energy’s wind portfolio has now surpassed 1,000 MW, which is nearly a third of our total generating capacity."
The company will also buy the power generated from Los Vientos IV wind farm, which is planned to be completed in 2016.
Vestas will be responsible for operations and maintenance of the turbines on Los Vientos III for three years. It will also provide turbines for the Los Vientos IV and V farms.
Work on the 200MW Los Vientos IV and 110MW Los Vientos V projects is underway in Starr County.
