Skip Navigation
Denis P. O’Brien

Denis P. O’Brien

Senior Executive Vice President, Exelon Corporation; Chief Executive Officer, Exelon Utilities


O’Brien oversees the utility businesses of Exelon:  Baltimore Gas & Electric (BGE), Commonwealth Edison Company (ComEd) and PECO. Together, they make Exelon one of the largest electric and natural gas distribution companies in the nation, serving more than 6.6 million electric, and 1.2 million gas customers. Its utility service territories cover more than 15,700 square miles in Maryland, Illinois and Pennsylvania. O’Brien is responsible for leading and maximizing operational and financial performance across the three utilities.


Professional History

O’Brien previously served as executive vice president of Exelon and CEO of Philadelphia-based PECO, Pennsylvania’s largest electric and natural gas utility. In that role, he was responsible for leadership of PECO’s operations and overall performance associated with service reliability, customer satisfaction, financial management, and regulatory and external affairs.

O’Brien was appointed to the top leadership position for PECO in 2003 and was named president and CEO in 2007. He has over 30 years of utility experience in engineering, operations, strategic planning and executive management. Prior to becoming CEO of PECO, he served as executive vice president and as vice president for operations with responsibility for engineering, construction, maintenance and emergency response for the company’s natural gas and electric distribution systems. His special assignments have included strategic planning on mergers and acquisitions, development of the company’s deregulation strategy and organizational redesigns to improve performance. PECO has been highly recognized for leading employee safety, diversity, economic development and environmental programs.

PECO’s renewable energy credit commitment avoids carbon dioxide emissions equal to taking about 60,000 cars off the road each year.”

Civic Involvement

O’Brien serves on the board of Independence Blue Cross. He also serves as chairman of the board of directors of the Electric Power Research Institute (EPRI). His other civic and industry board appointments include the Pennsylvania Business Council, Greater Philadelphia Chamber of Commerce, the CEO Council for Growth, the Franklin Institute, and the Drexel University board of trustees. He also has previously served on the board of directors for the American Gas Association (AGA), Energy Association of Pennsylvania, Pennsylvania Economy League, YMCA of Greater Philadelphia and WHYY, Inc.


O’Brien holds a bachelor’s degree in industrial engineering from Rutgers University and earned a master’s degree in business from Drexel University. 


O’Brien and his wife, Carolyn, have three children.

Profile: Denis P. O’Brien [PDF 98KB]Senior Executive Vice President, Exelon Corporation; Chief Executive Officer, Exelon UtilitiesPDFPDFs require software like the Adobe Acrobat Reader to be viewed properly.

Get Adobe Reader

Denis P. O’Brien