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NextEra Energy's regulated utility, Florida Power & Light, is the largest rate-regulated utility in Florida. The utility distributes power to over 6 million customer accounts in Florida and owns 36 gigawatts of generation. FP&L contributes roughly 70% of NextEra's consolidated operating earnings. NextEra Energy Resources, the renewable energy segment, generates and sells power throughout the United States and Canada with more than 37 GW of generation capacity, including natural gas, nuclear, wind, and solar.

PPL is a holding company of regulated utilities in Pennsylvania, Kentucky, and Rhode Island. The Pennsylvania regulated delivery and transmission segment distributes electricity to customers in central and eastern Pennsylvania. LG&E and KU are involved in regulated electricity generation, transmission, and distribution in Kentucky. The Kentucky utilities also serve gas customers. Rhode Island Energy operates electric and gas utilities in Rhode Island.

Eversource Energy is a diversified holding company with subsidiaries that provide rate-regulated electric and gas distribution service to more than 4 million customers in the Northeast US. The company plans to sell its water utility, Aquarion, in 2025. Eversource expanded its service territories with acquisitions of NStar (2012), Aquarion (2017), and Columbia Gas (2020). In 2024 Eversource exited its 50% partnership with European utility Orsted to develop 2 gigawatts of offshore wind projects in the Northeast US. The company exited most of its unregulated businesses in 2006.

Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 50 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the U.S. and sells the electricity primarily under long-term contracts.