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Duke Energy Corporation, together with 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 in the Carolinas, Florida, and the Midwest. It generates electricity through coal, hydroelectric, natural gas, oil, solar and wind sources, renewables, and nuclear fuel. This segment also engages in the wholesale of electricity to municipalities, electric cooperative utilities, and load-serving entities. The GU&I segment distributes natural gas to residential, commercial, industrial, and power generation natural gas customers; and invests in pipeline transmission projects, renewable natural gas projects, and natural gas storage facilities. The company was formerly known as Duke Energy Holding Corp. and changed its name to Duke Energy Corporation in April 2006. Duke Energy Corporation was founded in 1904 and is headquartered in Charlotte, North Carolina.

NextEra Energy, Inc., through its subsidiaries, generates, transmits, distributes, and sells electric power to retail and wholesale customers in North America. The company generates electricity through wind, solar, nuclear,natural gas, and other clean energy. It also develops, constructs, and operates long-term contracted assets that consists of clean energy solutions, such as renewable generation facilities, battery storage projects, and electric transmission facilities; sells energy commodities; and owns, develops, constructs, manages and operates electric generation facilities in wholesale energy markets. The company had approximately 33,276 megawatts of net generating capacity; approximately 90,000 circuit miles of transmission and distribution lines; and 883 substations. It serves approximately 12 million people through approximately 5.9 million customer accounts in the east and lower west coasts of Florida. The company was formerly known as FPL Group, Inc. and changed its name to NextEra Energy, Inc. in 2010. NextEra Energy, Inc. was founded in 1925 and is headquartered in Juno Beach, Florida.

National Grid plc transmits and distributes electricity and gas. The company operates through UK Electricity Transmission, UK Electricity Distribution, UK Electricity System Operator, New England, New York, National Grid Ventures, and Other segments. The UK Electricity Transmission segment provides electricity transmission and construction work services in England and Wales. The UK Electricity Distribution segment offers electricity distribution services in Midlands, and South West of England and South Wales. The UK Electricity System Operator segment provides balancing services for supply and demand of electricity on Great Britain's electricity transmission system; and acts as an agent on behalf of transmission operators. The New England segment offers electricity and gas distribution, and electricity transmission services in New England. The New York segment provides electricity and gas distribution, and electricity transmission services in New York. The National Grid Ventures segment provides transmission services through electricity interconnectors and LNG importation at the Isle of Grain, as well as sale of renewables projects. The Other segment engages in the leasing and sale of commercial property, as well as insurance activities in the United Kingdom. The company was founded in 1990 and is headquartered in London, the United Kingdom.

The Southern Company, through its subsidiaries, engages in the generation, transmission, and distribution of electricity. The company also develops, constructs, acquires, owns, and manages power generation assets, including renewable energy projects and sells electricity in the wholesale market; and distributes natural gas in Illinois, Georgia, Virginia, and Tennessee, as well as provides gas marketing services, gas distribution operations, and gas pipeline investments operations. In addition, it owns and operates nuclear, coal, hydro, cogeneration, solar, wind, battery storage, and fuel cell facilities. Further, the constructs, operates, and maintains approximately 77,900 miles of natural gas pipelines and 14 storage facilities with total capacity of 157 Bcf to provide natural gas to residential, commercial, and industrial customers. The company serves approximately 8.9 million electric and gas utility customers. Further, it develops distributed energy and resilience solutions; deploys microgrids for commercial, industrial, governmental, and utility customers; and offers digital wireless communications and fiber optics services. The Southern Company was incorporated in 1945 and is headquartered in Atlanta, Georgia.