TMI Unit 1 Back On-Line after Maintenance

Exelon Press Release LONDONDERRY TWP. Pa. (May 31, 2010) – Three Mile Island Unit 1 (TMI-1) began producing carbon-free electricity today at 7:18 a.m. ET when operators connected the plant to the regional power grid. TMI-1 generates 852 megawatts of electricity, enough power for more than 800,000 homes. The unit was taken offline on May 28 at 11 p.m. ET to perform maintenance on a reactor coolant pump. The maintenance work has been completed. While the plant was offline, plant personnel took advantage of the opportunity to do additional maintenance to ensure a reliable summer operating run.