Three Mile Island Unit 1 (TMI-1), located in Middletown, Pa., is a nuclear generating facility capable of producing 875 net megawatts. TMI-1 is a pressurized water reactor that, at full power, meets the electricity needs of a city the size of Philadelphia.

The plant began commercial operation in 1974. In December 1999, General Public Utilities sold TMI-1 to AmerGen, a joint venture of PECO and British Energy, of Edinburgh, Scotland.

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Last modified: June 11, 2008