In a petition filed Thursday with the Maryland Public Service Commission, French utility EDF Group said its "interests are unique and will be affected by the proposed transaction which implicates significant issues related to reliability."
EDF owns nearly half of Constellation's nuclear power business, which operates plants in New York and two Calvert Cliffs units in Southern Maryland. EDF is looking for a U.S. partner so it can move forward with plans to develop a third Calvert Cliffs plant.
"As one of the principal participants in Maryland's energy future … EDF has a vested interest in the proposed merger between Exelon and Constellation and its impact on ensuring reliable energy in Maryland," EDF spokeswoman Kelly Sullivan said in a statement. EDF is also Constellation's largest shareholder with a nearly 7.3 percent stake in the company.
The $7.9 billion deal between Constellation and Exelon requires approval by the Public Service Commission, which oversees Constellation's regulated utility, Baltimore Gas & Electric Co.
The PSC is expected Tuesday to consider a schedule to review the $7.9 billion deal, which would create the largest competitive power provider in the United States.