Three Mile Island is a nuclear power plant site located on Three Mile Island in the Susquehanna River near Middletown in Dauphin County, Pennsylvania, just southeast of Harrisburg in the United States.

Quick location facts

  • The Three Mile Island Nuclear Generating Station sits on a small island in the Susquehanna River in south-central Pennsylvania.
  • It is about 10–12 miles (around 16–19 km) southeast of downtown Harrisburg, the state capital.
  • The nearest town is Middletown, Pennsylvania, which lies on the eastern bank of the river opposite the island.

Extra context

  • The site became internationally known after a partial reactor meltdown in 1979 at Unit 2, often referred to as the Three Mile Island accident.
  • The plant has been shut down, but the location name “Three Mile Island” is still commonly used in news, documentaries, and forum discussions about nuclear safety and U.S. energy history.

Information gathered from public forums or data available on the internet and portrayed here.