Duke Energy ( NYSE: DUK ), Samsung SDI and Younicos will work together to update Duke Energy's 36-MW energy storage and power management system at its Notrees Windpower Project in west Texas. The system has been operating since 2012 with lead acid batteries. By 2016, these batteries will be replaced with lithium-ion technology. "The Notrees Energy Storage Project has proven to be a valuable asset, achieving the objectives of our partnership with ERCOT (Energy Reliability Council of Texas) and the Department of Energy," said Greg Wolf, president of Duke Energy, Commercial Portfolio. "Because battery technology is rapidly evolving, we have an opportunity to upgrade the facility to better match the function that has become most valuable in the Texas market — fast response frequency regulation."