Exelon
Constellation Energy
Delmarva Power
Pepco Holdings
PECO Energy Company
PEPCO
Commonwealth Edison
Public Service Enterprise Group
FirstEnergy Corp.
Dominion Energy
PJM Interconnection
Duke Energy
American Electric Power Company, Inc.
NiSource
Gas and electric utility
bge.com
Baltimore Gas and Electric Company is a subsidiary of the Exelon Corporation and Maryland’s largest gas and electric utility. BGE earlier had created the holding company Constellation Energy in 1999. Wikipedia