NextEra Energy's regulated utility, Florida Power & Light, distributes power to roughly 5 million customers in Florida. Florida Power & Light contributes over 60% of the group's operating earnings. Gulf Power also operates in Florida. The renewable energy segment generates and sells power throughout the United States and Canada. Consolidated generation capacity totals over 45 gigawatts and includes natural gas, nuclear, wind, and solar assets.

The Southern Company is one of the largest utilities in the U.S. The company distributes electricity and natural gas to approximately 9 million customers in nine states. It owns 50 gigawatts of generating capacity, primarily for serving regulated customers in Georgia, Alabama, and Mississippi. Wholly owned unregulated Southern Power Company owns over 11 gigawatts of mostly renewable energy capacity and sells the electricity primarily under long-term power sales agreements. The solar and wind farms are located in Southern's regulated jurisdictions, but also in Texas, California, and other states.

Duke Energy is one of the largest U.S. utilities, with regulated utilities in the Carolinas, Indiana, Florida, Ohio, and Kentucky that deliver electricity and gas to more than 7 million customers. Duke operates in three major segments: electric utilities and infrastructure; gas utilities and infrastructure; and commercial renewables.

Based in Richmond, Virginia, Dominion Energy is an integrated energy company with approximately 31,000 megawatts of electric generation capacity; over 100,000 miles of natural gas transmission, distribution and gathering pipelines; and more than 93,000 miles of electric transmission and distribution lines. Dominion operates one of the nation's largest natural gas storage systems with over 1 trillion cubic feet of capacity, recently completed a liquefied natural gas export facility in Maryland, and is 48% owner of the under construction Atlantic Coast Pipeline.

American Electric Power is one of the largest regulated utilities in the United States, providing electricity generation, transmission, and distribution to more than 5 million retail customers in 11 states. About 47% of AEP's of capacity is coal, with the remainder from a mix of natural gas (27%), renewables (14%), nuclear (7%), and demand response (5%). Earnings are supported by vertically integrated utilities, transmission and distribution utilities, competitive transmission, and unregulated generation and marketing.

Exelon serves more customers than any other U.S. utility, with 10 million power and gas customers at its six regulated utilities in Illinois, Pennsylvania, Maryland, New Jersey, Delaware, and Washington, D.C. Exelon owns 14 nuclear plants and 32 gigawatts of generation capacity throughout North America.

National Grid owns and operates the electric and gas transmission system in England and Wales. In June 2019, it will fully divest its U.K. natural gas distribution business. In the Northeastern United States, it serves 7.1 million electricity and gas customers combined in three states. It also owns regulated transmission and electricity generation in the United States, metering services, merchant transmission lines in the U.K., and the Grain (U.K.) liquefied natural gas facility.

Sempra Energy serves one of the largest utility customer bases in the United States. It distributes natural gas and electricity in Southern California and owns 80% of Oncor, a transmission and distribution business in Texas. SoCalGas and San Diego Gas & Electric distribute gas to more than 20 million customers, while Oncor serves over 10 million Texas customers. The firm's other affiliates own and operate liquefied natural gas facilities in North America and infrastructure in Mexico.

Xcel Energy manages utilities serving 3.6 million electric customers and 2 million natural gas customers in eight states. Its utilities are Northern States Power, which serves customers in Minnesota, North Dakota, South Dakota, Wisconsin, and Michigan; Public Service Company of Colorado; and Southwestern Public Service Company, which serves customers in Texas and New Mexico. It is one of the largest renewable energy providers in the U.S. with about one quarter of its energy sales coming from renewable energy.

WEC Energy Group's electric and gas utility businesses serve electric and gas customers in its Illinois, Michigan, Minnesota, and Wisconsin service territories. WEC Energy Group also owns a 60.0% stake in American Transmission Company. WEC Energy Group's business mix is approximately 56% electric generation and distribution, 29% gas distribution, and 15% electric transmission.