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Con Ed is a holding company for Consolidated Edison of New York, or CECONY, and Orange & Rockland, or O&R. These utilities provide steam, natural gas, and electricity to customers in southeastern New York—including New York City—and small parts of New Jersey. The two utilities generate nearly all of Con Ed's earnings following the sale of its clean energy business to RWE in early 2023.

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. In Kentucky, LG&E and KU are involved in regulated electricity generation, transmission, and distribution. LG&E also provides regulated natural gas distribution. Rhode Island Energy operates electric and gas utilities in the state.

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 44 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 US and sells the electricity primarily under long-term contracts.

Alliant Energy is the parent of two regulated utilities, Interstate Power and Light and Wisconsin Power and Light. Together, IPL and WPL serve nearly 1 million electric customers and 425,000 natural gas-only customers. Both subsidiaries engage in the generation and distribution of electricity and the distribution and transportation of natural gas. Alliant also owns a 16% interest in American Transmission Co.