Constellation Energy Announces Key Executive Appointments

Constellation Energy announced two new management appointments – Jonathan (Jack) W. Thayer as chief financial officer and Charles A. Berardesco as general counsel – as the Company progresses toward closing its merger with MidAmerican Energy Holdings Company. The appointments are effective immediately.

“Jack and Charlie are talented and experienced executives, who possess extensive knowledge of their disciplines, as well as a deep understanding of Constellation Energy’s businesses, customers, stakeholders and culture,” said Mayo A. Shattuck III, chairman, president and chief executive officer of Constellation Energy. “I am confident in their ability and expertise to move the company forward and achieve our strategic objectives.”

Thayer, 37, previously served as vice president and managing director of corporate strategy and development at Constellation Energy, and was appointed treasurer in August 2008. He succeeds John R. Collins, who has stepped down from his role as chief financial officer and will move into an advisory capacity to assist with the MidAmerican merger and other strategic initiatives. Collins will continue to serve as chairman, Constellation Energy Partners, LLC (NYSE: CEP), which was formed, and is approximately 28 percent owned, by Constellation Energy.

Berardesco, 50, previously vice president, deputy general counsel, chief compliance officer and corporate secretary of Constellation Energy, succeeds Irving B. Yoskowitz, who is retiring.

As vice president and managing director of corporate strategy and development, Thayer has been responsible for strategic transaction analysis and planning since his appointment in November 2004. He previously headed Constellation Energy’s investor relations department, managing relationships with the Company’s shareholders and analysts and building an industry-leading investor relations and shareholder services function as part of Constellation Energy’s corporate turnaround. Prior to joining Constellation Energy, Thayer held financial positions at Deutsche Bank Securities Inc. and SBC Warburg Dillon Read Inc., where he focused on mergers and acquisitions and transaction financing.

Thayer earned a bachelor’s degree from Middlebury College and a master’s degree in business administration from Harvard University.

Berardesco has served as vice president and deputy general counsel since September 2006. He has been responsible for Constellation Energy’s SEC reporting, legal compliance and ethics programs, supporting mergers and acquisitions, corporate finance and corporate staff functions, while also coordinating the activities of the Company’s Board of Directors. He joined Constellation Energy in January 2003 as associate general counsel and was appointed chief compliance officer and corporate secretary in 2005. Prior to joining Constellation Energy, Berardesco served as vice president, general counsel and corporate secretary of Fusura, a consortium of AIG, Kemper and Prudential. He also was senior vice president, general counsel and corporate secretary for HCIA, a publicly held health care information company, and was previously counsel with the national law firm of Piper Rudnick and partner in the law firm of Whiteford, Taylor & Preston.

Berardesco earned his bachelor’s degree from Duke University and his Juris Doctor from The George Washington University, where he was the managing editor of The George Washington Law Review.