The Three Mile Island Accident was a nuclear meltdown of the Three Mile Island Generating Station near the capital city of Harrisburg, Pennsylvania. The meltdown began in 1979 and released radioactive gases into the environment, culminating in the worst accident of American nuclear energy. The incident increased the decline to build new reactors.
After the Three Mile Island Accident, anti-nuclear energy sentiment grew significantly. Anti-nuclear activists expressed worries about regional health effects, and American uncertainty declined further creation of nuclear power plants.