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T. Preston Gillespie

Executive Vice President,
Chief Generation Officer and
Enterprise Operational Excellence

Preston Gillespie

T. Preston Gillespie

Preston Gillespie serves as executive vice president, chief generation officer and enterprise operational excellence for Duke Energy. He is responsible for the safe, efficient and reliable operation of Duke Energy's fleet of nuclear, natural gas, hydro, solar and coal units with a generating capacity of over 50,000 megawatts. He is also responsible for enterprise operational excellence, project management and environmental, health and safety.

Gillespie has more than 35 years of experience in the energy field. He previously served as Duke Energy’s chief nuclear officer. In this role, he was responsible for the safe and efficient operation of the nation’s largest regulated nuclear generating fleet. Other leadership roles across the company’s nuclear fleet include senior vice president of nuclear operations, site vice president and plant manager of Oconee Nuclear Station, and site operations manager of Catawba Nuclear Station. In these roles, he directed station and facilities management, operations, maintenance, chemistry, radiation protection, engineering, nuclear and industrial safety, and business operations. He joined the company in 1986 as an assistant engineer at Oconee Nuclear Station, where he earned his senior reactor operator license and held positions in a variety of roles in engineering and operations.

Gillespie currently serves on the board of directors for Nuclear Electric Insurance Limited and is a member of the National Nuclear Accrediting Board for the Institute of Nuclear Power Operations.

A native of Charleston, S.C., Gillespie earned a Bachelor of Science degree in mechanical engineering from Clemson University. He is a registered professional engineer in South Carolina and a graduate of Wharton’s Advanced Management Program. Gillespie is also a past recipient of the company’s Robinson Award, which recognized employees for their outstanding contributions to the company’s operations.

Gillespie and his wife, Donna, have a son.


Last updated March 30, 2024


Duke Energy

Duke Energy, one of the largest energy holding companies in the United States, supplies and delivers electric services to approximately 8.4 million customers in the Southeast and Midwest. The company also distributes natural gas services to approximately 1.7 million customers in the Carolinas, Ohio, Kentucky and Tennessee. Headquartered in Charlotte, N.C., Duke Energy is a Fortune 150 company traded on the New York Stock Exchange under the symbol DUK.