FirstEnergy is one of the nation's largest investor-owned electric utilities, principally engaged in the transmission, distribution, and generation of electricity serving millions of customers across the Midwest and Mid-Atlantic regions. The company operates through three segments: a distribution business that delivers electricity in Ohio and Pennsylvania, an integrated segment combining distribution and transmission with regulated generation capacity in multiple states, and a stand-alone transmission segment owning and operating high-voltage transmission infrastructure. FirstEnergy generates revenue under regulated cost-of-service regulation, with rates set by federal and state authorities, recovering distribution and transmission costs, fuel and purchased power expenses, and approved capital investments through its utility subsidiaries serving residential, commercial, and industrial customers.