Exelon Nuclear Fact Sheet Exelon Nuclear, a division of Exelon Generation, is headquartered in Kennett Square, Pa. and operates the largest U.S. fleet of carbon-free nuclear plants with more than 17,800 megawatts of capacity from 21 reactors at 12 facilities in Illinois, Maryland, New York and Pennsylvania. Dave Rhoades is President and Chief Nuclear Officer, Exelon Nuclear. There are more than 10,000 nuclear professionals working in Exelon Generation’s nuclear division. These professionals implement industry best practices to ensure safe, reliable operation throughout Exelon’s nuclear fleet. Exelon believes that clean, affordable energy is the key to a brighter, more sustainable future. Exelon’s nuclear power plants account for approximately 60 percent of Exelon’s power generation portfolio. Nuclear power plants are critical to the stability of the U.S. electrical grid because they can produce an uninterrupted flow of electricity for extended periods. This uninterrupted flow supplies the necessary level of baseload electricity for the grid to operate around-the-clock. Exelon’s nuclear stations Braidwood Generating Station Braceville, Illinois Byron Generating Station Byron, Illinois Calvert Cliffs Nuclear Power Plant Lusby, Maryland Clinton Power Station Clinton, Illinois Dresden Generating Station Morris, Illinois FitzPatrick Nuclear Power Plant Scriba, New York Ginna Nuclear Power Plant Ontario, New York LaSalle County Generating Station Marseilles, Illinois Limerick Generating Station Pottstown, Pennsylvania Nine Mile Point Nuclear Station Scriba, New York Peach Bottom Atomic Power Station Delta, Pennsylvania Quad Cities Generating Station Cordova, Illinois Updated: January 2021 .