High Quality Content by WIKIPEDIA articles! Three Mile Island Nuclear Generating Station (TMI) is a civilian nuclear power plant located on Three Mile Island in the Susquehanna River, in Londonderry Township, Dauphin County, south of Harrisburg, Pennsylvania, United States. It has two separate generators, known as TMI-1 and TMI-2. The plant is best known for having been the site of the worst civilian nuclear accident in United States history on March 29, 1979, when TMI-2 suffered a partial meltdown. According to the US Nuclear Regulatory Commission, the accident resulted in no deaths or injuries to plant workers or members of nearby communities, a contention that is disputed by some academics, journalists and local residents. The reactor core of TMI-2 has since been removed from the site, but the site has not been decommissioned yet.