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Ameren Corporation, together with its subsidiaries, operates as a public utility holding company in the United States. The company operates through four segments: Ameren Missouri, Ameren Illinois Electric Distribution, Ameren Illinois Natural Gas, and Ameren Transmission. It engages in the rate-regulated electric generation, transmission, and distribution activities; and rate-regulated natural gas distribution business. In addition, the company generates electricity through coal, nuclear, and natural gas, as well as renewable sources, such as hydroelectric, wind, methane gas, and solar. It serves residential, commercial, and industrial customers. The company was founded in 1881 and is headquartered in Saint Louis, Missouri.

CMS Energy Corporation operates as an energy company primarily in Michigan. The company operates through three segments: Electric Utility; Gas Utility; and Enterprises. The Electric Utility segment is involved in the generation, purchase, transmission, distribution, and sale of electricity. This segment generates electricity through coal, wind, gas, renewable energy, oil, and nuclear sources. Its distribution system comprises 208 miles of high-voltage distribution overhead lines; 4 miles of high-voltage distribution underground lines; 4,428 miles of high-voltage distribution overhead lines; 19 miles of high-voltage distribution underground lines; 82,474 miles of electric distribution overhead lines; 9,395 miles of underground distribution lines; 1,093 substations; and 3 battery facilities. The Gas Utility segment engages in the purchase, transmission, storage, distribution, and sale of natural gas, which includes 2,392 miles of transmission lines; 15 gas storage fields; 28,065 miles of distribution mains; and 8 compressor stations. The Enterprises segment is involved in the independent power production and marketing, including the development and operation of renewable generation. It serves 1.9 million electric and 1.8 million gas customers, including residential, commercial, and diversified industrial customers. The company was incorporated in 1987 and is headquartered in Jackson, Michigan.

DTE Energy Company engages in the utility operations. The company's Electric segment generates, purchases, distributes, and sells electricity to various residential, commercial, and industrial customers in southeastern Michigan. It generates electricity through coal-fired plants, hydroelectric pumped storage, and nuclear plants, as well as wind and solar assets. This segment owns and operates distribution substations and line transformers. The company's Gas segment purchases, stores, transports, distributes, and sells natural gas to various residential, commercial, and industrial customers throughout Michigan; and sells storage and transportation capacity. Its DTE Vantage segment offers metallurgical and petroleum coke to steel and other industries; and power generation, steam production, chilled water production, and wastewater treatment services, as well as air supplies compressed air to industrial customers. Its Energy Trading segment engages in power, natural gas, and environmental marketing and trading; structured transactions; and the optimization of contracted natural gas pipeline transportation and storage positions. The company was founded in 1849 and is based in Detroit, Michigan.

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.