Preston Gillespie serves as executive vice president, chief generation officer and enterprise operational excellence for Duke Energy. He is responsible for the safe, reliable and efficient operations 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 the company’s environmental, health and safety policies and programs.
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 boards for Nuclear Electric Insurance Limited and Charlotte Sports Foundation, and on the advisory board for Clemson University’s College of Engineering, Computing and Applied Sciences. He is also 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.
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Who are Duke Energy's active insiders?
Duke Energy's insider roster includes Kodwo Ghartey-Tagoe (EVP), Thomas Gillespie, Jr. (Executive Vice President, Chief Generation Officer and Enterprise Operational Excellence), Robert Glenn (CEO), Lynn Good (Chair & CEO), Dwight Jacobs (SVP), Dhiaa Jamil (COO), Julia Janson (EVP), E. Mckee (Director), Louis Renjel (SVP), Harry Sideris (SVP), Bonnie Titone (Senior Vice President and Chief Administrative Officer), Lloyd Yates (EVP), and Steven Young (CFO). Learn More on Duke Energy's active insiders.
Are insiders buying or selling shares of Duke Energy?
During the last year, insiders at the utilities provider sold shares 3 times. They sold a total of 16,900 shares worth more than $2,096,462.00. The most recent insider tranaction occured on November, 19th when EVP Robert Alexander Glenn sold 8,200 shares worth more than $1,015,160.00. Insiders at Duke Energy own 0.1% of the company.
Learn More about insider trades at Duke Energy. Information on this page was last updated on 11/19/2025.
