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Michael Pacilio

Michael Pacilio

Exelon Nuclear President and Chief Nuclear Officer, Exelon Generation


Pacilio is responsible for ensuring that Exelon Generation maintains high levels of performance and safety across its nuclear fleet. Exelon Generation operates the largest nuclear fleet in the nation, which includes 23 reactors at 14 facilities located in Illinois, Maryland, Nebraska, New Jersey, New York, and Pennsylvania.

Professional History

Pacilio has more than 25 years of experience with the company. Most recently, he was Exelon Generation’s chief operating officer for the nuclear division, in which he was responsible for overseeing the daily operations for all of Exelon Generation’s nuclear facilities. Previously he was the senior vice president of Midwest operations. In this role, he was responsible for Exelon’s six Illinois nuclear operating facilities and 11 reactors:  Braidwood, Byron, Clinton, Dresden, LaSalle and Quad Cities stations and SAFSTOR activities for Zion Station. He held the position of site vice president for both the Clinton and Braidwood stations. He also served as plant manager at Clinton Station and in a variety of management roles at Dresden and Quad Cities stations.

Additionally, Pacilio worked on the Unicom/PECO integration team, which ensured a smooth transition following the merger that created Exelon.


Pacilio holds a bachelor’s degree in electrical engineering from Purdue University and a senior reactor operator certification from Dresden Station. He completed the Exelon Leadership Institute Program through the Northwestern University Kellogg School of Management and the Advanced Management Program at Harvard University.


Mike, his wife, Cheryl, and their four children live in Geneva, Ill.

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Michael Pacilio