The Southern Company, through its subsidiaries, engages in the generation, transmission, and distribution of electricity. It operates through Gas Distribution Operations, Gas Pipeline Investments, Wholesale Gas Services, and Gas Marketing Services segments.

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.

NextEra Energy, Inc., through its subsidiaries, generates, transmits, distributes, and sells electric power to retail and wholesale customers in North America.

Consolidated Edison, Inc., through its subsidiaries, engages in the regulated electric, gas, and steam delivery businesses in the United States. It offers electric services to approximately 3.5 million customers in New York City and Westchester County; gas to approximately 1.1 million customers in Manhattan, the Bronx, parts of Queens, and Westchester County; and steam to approximately 1,555 customers in parts of Manhattan.

Duke Energy Corporation, together with its subsidiaries, operates as an energy company in the United States. It operates through three segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure, and Commercial Renewables.

Exelon Corporation, a utility services holding company, engages in the energy generation, delivery, and marketing businesses in the United States and Canada.

Edison International, through its subsidiaries, generates and distributes electric power. It delivers electricity to 15 million residential, commercial, industrial, public authorities, agricultural, and other customers across Southern, Central, and Coastal California.