Exelon's PECO Declares Dividends on Preferred Stock

Directors of PECO Energy Company have declared dividends on all series of preferred stock, payable August 1, 2012, to shareholders of record at the close of business on June 29, 2012, as follows:

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). Learn more at: www.exeloncorp.com.

Based in Philadelphia, PECO is an electric and natural gas utility subsidiary of Exelon Corporation (NYSE: EXC).PECO serves 1.6 million electric and 491,000 natural gas customers in southeastern Pennsylvania and employs about 2,400 people in the region.PECO delivered 82.1 billion cubic feet of natural gas and 38.1 billion kilowatt-hours-hours of electricity in 2011.Founded in 1881, PECO is one of the Greater Philadelphia Region's most active corporate citizens, providing leadership, volunteer and financial support to numerous arts and culture, education, environmental, economic development and community programs and organizations.

Contacts:

Exelon Corporate Communications
Judith Rader, 312-394-7417
or
Exelon Investor Relations
JaCee Burnes, 312-394-2948