Smoke Inside Room Prompts Declaration WARRENVILLE, Ill., Feb. 24 /PRNewswire-FirstCall/ -- Operators at Byron Station declared an Unusual Event at 8:54 a.m. CST today after smoke was found in a room inside of the protected area of the plant. The Unusual Event was terminated at 11:09 a.m. The smoke came from electrical equipment inside of the room. The smoke ceased once electricity to the equipment was cut off. Appropriate local, state and federal agencies were notified. The Byron Fire Department was called to the station as a contingency when the smoke was discovered. There were no injuries or release of radiation, and no damage to safety- related equipment. An Unusual Event is the lowest of the four emergency classifications as defined by the Nuclear Regulatory Commission. Byron Station is located in Ogle County, Ill., about 25 miles southwest of Rockford. Exelon Corporation is one of the nation's largest electric utilities with approximately 5.2 million customers and more than $15 billion in annual revenues. The company has one of the industry's largest portfolios of electricity generation capacity, with a nationwide reach and strong positions in the Midwest and Mid-Atlantic. Exelon distributes electricity to approximately 5.2 million customers in northern Illinois and Pennsylvania and gas to more than 460,000 customers in the Philadelphia area. Exelon is headquartered in Chicago and trades on the NYSE under the ticker EXC. First Call Analyst: FCMN Contact: DATASOURCE: Exelon Nuclear CONTACT: Bob Kartheiser, +1-815-406-3554, or Craig Nesbit, +1-630-657-4208, both for Exelon Nuclear Web site: http://www.exeloncorp.com/

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