SUGAR LAND--January 16, 2013--Researched by Industrial Info Resources (Sugar Land, Texas)-- Duke Energy Corporation (NYSE:DUK) (Charlotte, North Carolina) recently added 402 megawatts (MW) to its renewable portfolio by commissioning the Los Vientos Windfarm , which is located in Willacy County in south Texas. Construction started in the fourth quarter of 2011 and was completed the fourth quarter of 2012.