FirstEnergy Corp. operates as a diversified energy company. It engages in the generation, transmission, and distribution of electricity, as well as energy management and other energy-related services through its subsidiaries. It operates through the following segments: Regulated Distribution, Regulated Transmission, and Competitive Energy Services (CES). The Regulated Distribution segment distributes electricity through FirstEnergy's utility operating companies, serving various customers within Ohio, Pennsylvania, West Virginia, Maryland, New Jersey and New York. The Regulated Transmission segment transmits electricity through transmission facilities owned and operated by FirstEnergy's utilities and the regulatory assets. The CES segment supplies electricity to end-use customers through retail and wholesale arrangements, including competitive retail sales to customers primarily in Ohio, Pennsylvania, Illinois, Michigan, New Jersey and Maryland, and the provision of partial POLR and def