PECO, formerly the Philadelphia Electric Company, is an energy company founded in 1881 and incorporated in 1929. It became part of Exelon Corporation (NYSE: EXC) in 2000 when it merged with Unicom. The company has approximately 2,300 employees; its call center and field craft personnel are members of IBEW Local 614. PECO serves 1.6 million electric and 485,000 natural gas customers; it is the largest combination utility in Pennsylvania, and has a franchise utility service area of 2,100 square miles (5,400 km2) with a population of 3.8 million people. PECOs peak electric load occurred on August 3, 2006 and was 8,932 megawatts (MWs) and its highest peak load in the winter season occurred on December 20, 2004 and was 6,838 MW. Residential electric usage makes up about 35 percent of PECO’s total electric delivery and half of the annual electric revenue.