Sirens to sound for three minutes at 12:15 p.m.
Exelon Generation will conduct its semi-annual, full volume test of the emergency warning sirens surrounding Three Mile Island Generating Station on Thursday, December 6 at approximately 12:15 p.m. This is one of two semi-annual tests performed each year.
The TMI emergency warning siren system consists of 96 sirens located in parts of Cumberland, Dauphin, Lancaster, Lebanon and York counties that are located within a 10-mile radius of TMI.
Three Mile Island Generating Station is located approximately 12 miles south of Harrisburg. The plant generates enough carbon-free electricity for 800,000 homes.