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American Electric Power Company, Inc., an electric public utility holding company, engages in the generation, transmission, and distribution of electricity for sale to retail and wholesale customers in the United States. It operates through Vertically Integrated Utilities, Transmission and Distribution Utilities, AEP Transmission Holdco, and Generation & Marketing segments. The company generates electricity using coal and lignite, natural gas, renewable, nuclear, hydro, solar, wind, and other energy sources. It also supplies and markets electric power at wholesale to other electric utility companies, rural electric cooperatives, municipalities, and other market participants. American Electric Power Company, Inc. was incorporated in 1906 and is headquartered in Columbus, Ohio.

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.

PG&E Corporation, through its subsidiary, Pacific Gas and Electric Company, engages in the sale and delivery of electricity and natural gas to customers in northern and central California, the United States. It generates electricity using nuclear, hydroelectric, fossil fuel-fired, fuel cell, and photovoltaic sources. The company owns and operates interconnected transmission lines; electric transmission substations, distribution lines, transmission switching substations, and distribution substations; and natural gas transmission, storage, and distribution system consisting of distribution pipelines, backbone and local transmission pipelines, and various storage facilities. It serves residential, commercial, industrial, and agricultural customers, as well as natural gas-fired electric generation facilities. PG&E Corporation was incorporated in 1905 and is based in Oakland, California.

Sempra operates as an energy infrastructure company in the United States and internationally. It operates through three segments: Sempra California, Sempra Texas Utilities, and Sempra Infrastructure. The Sempra California segment provides electric services; and natural gas services to San Diego County. As of December 31, 2023, it offered electric services to approximately 3.6 million population and natural gas services to approximately 3.3 million population that covers 4,100 square miles. This segment owns and operates a natural gas distribution, transmission, and storage system that supplies natural gas. As of December 31, 2023, it serves a population of 21 million covering an area of 24,000 square miles. The Sempra Texas Utilities segment engages in the regulated electricity transmission and distribution. As of December 31, 2023, its transmission system included 18,298 circuit miles of transmission lines; 1,257 transmission and distribution substations; interconnection to 173 third-party generation facilities totaling 54,277 MW; and distribution system included approximately 4.0 million points of delivery and consisted of 125,116 miles of overhead and underground lines. The Sempra Infrastructure segment develops, builds, operates, and invests in energy infrastructure to help enable the energy transition in North American markets and worldwide. The company was formerly known as Sempra Energy and changed its name to Sempra in May 2023. Sempra was founded in 1998 and is based in San Diego, California.