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.

Dominion Energy, Inc. produces and distributes energy in the United States. The company operates through four segments: Dominion Energy Virginia, Gas Distribution, Dominion Energy South Carolina, and Contracted Assets.

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.

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.

Entergy Corporation, together with its subsidiaries, engages in the production and retail distribution of electricity in the United States. The company operates in two segments, Utility and Entergy Wholesale Commodities.

Pinnacle West Capital Corporation, through its subsidiary, Arizona Public Service Company, provides retail and wholesale electric services primarily in the state of Arizona.

FirstEnergy Corp., through its subsidiaries, generates, transmits, and distributes electricity in the United States. It operates through Regulated Distribution and Regulated Transmission segments.

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