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NRG Energy is one of the largest retail energy providers in the US, with 6 million customers. Vivint Smart Home, which NRG acquired in 2023, has 2 million home-services customers. NRG also is one of the largest US independent power producers, with 13 gigawatts of coal, gas, and oil power generation capacity primarily in Texas. The LS Power asset acquisition adds 13 GW of gas-fired power plants mostly in the Eastern US. NRG exited Chapter 11 bankruptcy as a stand-alone entity in December 2003.

American Water Works is the largest investor-owned US water and wastewater utility, serving nearly 4 million customers in 14 states. It provides water and wastewater services to residential, commercial, and industrial customers and operates predominantly in regulated markets. The company's nonregulated business is water services for military bases, which operates under long-term contracts with regulated-like returns. The proposed Essential Utilities acquisition would add regulated water and wastewater utilities in Ohio, North Carolina, and Texas while increasing its presence in Illinois, Indiana, Pennsylvania, New Jersey, and Virginia.

WEC Energy Group's electric and gas utility businesses serve electric and gas customers in Illinois, Michigan, Minnesota, and Wisconsin service territories. The company also owns a 60% stake in American Transmission Co. WEC's asset mix is approximately 49% electric generation and distribution, 32% gas distribution, 10% electric transmission, 7% unregulated renewable energy, and 2% LNG distribution and generation.

Hawaiian Electric Industries is the parent company of three Hawaii-based regulated utilities and owns a 10% minority interest in Hawaii's American Savings Bank. The utilities provide electricity on the five islands of Oahu, Hawaii, Maui, Molokai, and Lanai.