CenterPoint Energy, Inc. operates as a public utility holding company in the United States. The company operates through Electric and Natural Gas segments.

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

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

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.

Alliant Energy Corporation operates as a utility holding company that provides regulated electricity and natural gas services. It operates through three segments: Utility Electric Operations, Utility Gas Operations, and Utility Other.

CMS Energy Corporation operates as an energy company primarily in Michigan. The company operates through three segments: Electric Utility; Gas Utility; and Enterprises.

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.

Evergy, Inc., together with its subsidiaries, engages in the generation, transmission, distribution, and sale of electricity in Kansas and Missouri, the United States.

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.

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.

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

PPL Corporation, a utility holding company, delivers electricity and natural gas in the United States and the United Kingdom. The company operates through two segments: Kentucky Regulated and Pennsylvania Regulated.

Xcel Energy Inc., through its subsidiaries, generates, purchases, transmits, distributes, and sells electricity. It operates through Regulated Electric Utility, Regulated Natural Gas Utility, and All Other segments.