KENNETT SQUARE, Pa., July 11 /PRNewswire-FirstCall/ -- The Independent System Operator New England (ISO-NE) has approved the deactivation of New Boston Generating Station's Unit 1, effective August 1, 2007. Activities relating to the deactivation of Unit 1 are expected to take at least four months. "Our decision to deactivate Unit 1 is based purely on economics," said Mark Schiavoni, Exelon Power President. "Without the Reliability Must Run (RMR), Unit 1 at New Boston is not profitable." New Boston was party to an RMR with ISO-NE from Jan. 1, 2002 until Nov. 15, 2006, under which the station was used to ensure reliability within the regional power grid during periods of high-energy demand. Various upgrades to the power grid have resulted in a decreased need for Unit 1 at New Boston. Since Nov. 15, 2006, the New Boston station has been operating as a merchant plant. Initially built in 1965, New Boston Unit 1 is a 350-megawatt natural gas intermediate unit. Unit 2, which was capable of producing 350 megawatts, was damaged in a fire in 2002 and is no longer in operation. The 20-megawatt L Street Gas Turbine, a Pratt & Whitney peaking unit that operates on distillate fuel oil, will be the only remaining unit under merchant operation at the site. Exelon Generation is assessing future potential use of the property and facility and has not made a decision about the future of the New Boston site. Until a decision is made, Exelon will maintain the site as it has done for other deactivated/decommissioned sites. Proper security and environmental procedures will be implemented to maintain the site and ensure that there is no environmental impact on the site or the surrounding area as a result of the deactivation. Exelon Generation is a unit of Exelon Corporation, one of the nation's largest electric utilities with 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 5.4 million customers in northern Illinois and Pennsylvania and natural gas to approximately 480,000 customers in the Philadelphia area. Exelon is headquartered in Chicago and trades on the NYSE under the ticker EXC. DATASOURCE: Exelon Generation CONTACT: Fred Maher of Exelon Generation, Communications, +1-610-765-6914 Web site: http://www.exeloncorp.com/

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