Exelon Corporation, a utility services holding company, engages in the energy generation and delivery businesses in the United States. It owns electric generating facilities, such as nuclear, fossil, and hydroelectric generation facilities, as well as wind and solar facilities. The company also sells renewable energy and other energy-related products and services; and engages in natural gas and oil exploration and production activities, as well as sells electricity and natural gas to wholesale and retail customers. In addition, it is involved in the purchase and regulated retail sale of electricity, and the provision of electricity transmission and distribution services to retail customers in northern Illinois, southeastern Pennsylvania, and central Maryland. Further, the company engages in the purchase and regulated retail sale of natural gas, and the provision of gas distribution services to retail customers in the Pennsylvania counties surrounding the City of Philadelphia, as well as in central Maryland, including the City of Baltimore. It serves distribution utilities, municipalities, cooperatives, and financial institutions, as well as commercial, industrial, governmental, and residential customers. The company was founded in 1887 and is headquartered in Chicago, Illinois.