September 22, 2012

 Three Mile Island Back On-Line 

 TMI returned to service September 22. 


Londonderry Township, PA – Three Mile Island Unit 1 returned to service today at 9:12 a.m. EDT when operators connected the plant’s turbine generator to the regional power grid.   The unit automatically shut down on Sept. 20 due to an unexpected actuation of a relay switch on a reactor coolant pump.  Plant personnel replaced the relay, installed additional monitoring capabilities of the relay and tested the pump prior to restarting the plant.      

“We performed the necessary repairs safely and efficiently and are committed to a reliable operating cycle,” said Rick Libra, TMI Site Vice President.

Three Mile Island is located about 12 miles south of Harrisburg, Pa.  The plant generates 852 megawatts of carbon free power - enough electricity for about 800,000 homes.  Electric customers were not affected by the plant being off-line.



About Exelon

Exelon Corporation (NYSE:EXC) is the nation’s leading competitive energy provider, with approximately $33 billion in annual revenues. Headquartered in Chicago, Exelon has operations and business activities in 47 states, the District of Columbia and Canada. Exelon is the largest competitive U.S. power generator, with approximately 35,000 megawatts of owned capacity comprising one of the nation’s cleanest and lowest-cost power generation fleets. The company’s Constellation business unit provides energy products and services to approximately 100,000 business and public sector customers and approximately 1 million residential customers. Exelon’s utilities deliver electricity and natural gas to more than 6.6 million customers in central Maryland (BGE), northern Illinois (ComEd) and southeastern Pennsylvania (PECO).


Ralph DeSantis Exelon Nuclear Communications