Hurricane Irene Update Sunday, August 28, 2011 8:30 A.M. 410-470-2364 (CENG Media Line)

Hurricane Irene Update

Sunday, August 28, 2011

8:30 A.M.

410-470-2364 (CENG Media Line)

As of 8:30 a.m. EDT, our nuclear power fleet is safe, secure and stable, including the Calvert Cliffs (Maryland) facility.

Late last night (Saturday, August 27), a large gust of wind sent a piece of aluminum siding, which dislodged from a nearby building, into contact with the main transformer at our Calvert Cliffs nuclear power facility in Lusby, Maryland.

The Unit 1 reactor automatically and safely went off-line, as designed.

Because of the situation, an Unusual Event (UE) was declared Saturday night. UE is the lowest of four emergency classifications by the NRC. We will exit the UE when we have safely completed all the actions in the site’s emergency response plan. We will update you when we safely exit the UE.

As dawn breaks, all employees are safe and the Calvert Cliffs facility is safe. We have no other significant damage and the site is accessible.

Throughout the storm, Calvert Cliff’s Unit 2 remained at 100 percent power. Two Nuclear Regulatory Commission (NRC) representatives remain on-site.

There was never a threat to the public; the site remains stable and secure.

Our thoughts and prayers are with all those in the path of Hurricane Irene, especially our employees, contractors and those in the communities in which we operate our facilities. Special thanks to those CENG employees who worked to keep the site safe and operational throughout the night.

In the nuclear energy industry and at CENG, safety is more than a priority or goal; it is our highest value.

Stay safe.

CENG (a joint venture of Constellation Energy Group, Inc. (NYSE: CEG) and EDF Group, SA) is based in Baltimore, Maryland. CEG owns 50.01% of CENG and is a leading supplier of energy products and services to wholesale and retail electric and natural gas customers. EDF owns 49.99% of CENG and is developing strategies in North America in nuclear, renewables and trading. CENG is a leading producer of safe and reliable nuclear power. The company owns and operates five nuclear reactors at three sites in New York and Maryland. CENG’s core values are nuclear and personal safety. Nuclear energy – America’s largest source of clean-air, carbon-free, reliable electricity, producing no greenhouse gases--accounts for more than 20 percent of U.S. produced electricity, powering one in five homes and businesses across the United States.