As of 2014, the largest electricity producing companies nationwide include Duke Energy, NRG Energy and Southern Company, as well as NextEra Energy and American Electric Power. The largest electricity suppliers include Duke Energy, Exelon Corporation and First Energy Corporation, as well as American Electric Power and PG&E Corporation.
Duke Energy, both the largest electricity producer and supplier, services 7.2 million customers with a generating capacity of 57,000 megawatts. NRG Energy generates 47,000 megawatts of electricity, while Southern generates 45,700 megawatts. NextEra Energy has a 42,500-megawatt production capacity, while American Electric Power produces 38,000 megawatts at peak capacity.
Exelon Corporation services 6.63 million customers, while First Energy Corporation services 6 million. American Electric Power has 5.35 million customers, while 5.2 million customers utilize PG&E Corporation.