Construction of the 28-turbine site began in February.
A single-megawatt turbine can generate enough electricity to power about 200 to 300 households.
Duke will deliver the power to the Electricity Reliability Council of Texas transmission system for sale to Barclays Bank.
This summer, Charlotte-based Duke began operating a 30-megawatt wind farm near Cheyenne, Wyo. The company plans to bring additional wind turbines into commercial operation this year in Texas.
Duke is a diversified energy company with a portfolio of natural gas and electric businesses, both regulated and unregulated, and a stake in Crescent Resources, a real estate development business. It has utility operations in the Carolinas, Ohio, Kentucky and Indiana.