Duke Energy Corporation, through its subsidiaries, operates as an energy company in the United States. It operates through two segments: Electric Utilities and Infrastructure (EU&I); and Gas Utilities and Infrastructure (GU&I). The EU&I segment generates, transmits, distributes, and sells electricity to approximately 8.6 million customers in the Southeast and Midwest regions. It generates electricity through coal, hydroelectric, natural gas, oil, renewables, and nuclear fuel.