Both Calvert Cliffs units back online generating power

After going offline April 7 in connection with a grid disruption in the Greater Washington, D.C. area, both Calvert Cliffs nuclear units are back up and generating power.

The reactor status report from the Nuclear Regulatory Commission (NRC) showed Calvert Cliffs 1 at 100% power and Calvert Cliffs 2 was at 96% power early April 10.

Exelon (NYSE:EXC), which operates the units, had confirmed April 8 that the units were shut down because of a local grid disturbance that caused power outages in the Washington, D.C./Maryland area.

The Calvert Cliffs complex is located on the western shore of the Chesapeake Bay in Calvert County and is Maryland’s only nuclear energy facility. The station is home to two pressurized water reactors (PWRs) capable of generating 1,768 MW combined. Units 1 and 2 began commercial operation in 1975 and 1977, respectively.

In the fall of 2014, NRC a 40-year license renewal for both units.

This past spring the NRC operating license for Calvert Cliffs and several other Northeast nuclear units were transferred from Constellation Energy Nuclear Group (CENG) to Exelon.

Exelon and Électricité de France (EDF) said in the summer of 2013 that they had agreed for the nuclear units, located in Maryland and New York, to be blended into the Exelon nuclear fleet.

About Wayne Barber 4201 Articles
Wayne Barber, Chief Analyst for the GenerationHub, has been covering power generation, energy and natural resources issues at national publications for more than 20 years. Prior to joining PennWell he was editor of Generation Markets Week at SNL Financial for nine years. He has also worked as a business journalist at both McGraw-Hill and Financial Times Energy. Wayne also worked as a newspaper reporter for several years. During his career has visited nuclear reactors and coal mines as well as coal and natural gas power plants. Wayne can be reached at