Under a cost recovery process established by the PSC in 2007, Mon Power and Potomac Edison customer bills are adjusted annually to reflect increases or decreases in the cost of fuel used to generate electricity and purchased power. Mon Power and Potomac Edison do not profit from increased fuel and purchased power costs. Mon Power, a FirstEnergy electric distribution company, serves about 385,000 customers in the northern half of West Virginia and Potomac Edison serves about 140,000 customers in the state's Eastern Panhandle. Follow the companies on Twitter @ MonPowerWV and @PotomacEdison. FirstEnergy is a diversified energy company dedicated to safety, reliability and operational excellence. Its 10 electric distribution companies form one of the nation's largest investor-owned electric systems, serving customers in Ohio, Pennsylvania, New Jersey, West Virginia, Maryland and New York.