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PG&E is a holding company whose main subsidiary is Pacific Gas and Electric, a regulated utility operating in Central and Northern California that serves 5.3 million electricity customers and 4.6 million gas customers in 47 of the state's 58 counties. PG&E operated under bankruptcy court supervision between January 2019 and June 2020. In 2004, PG&E sold its unregulated assets as part of an earlier postbankruptcy reorganization.

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.

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. NRG exited Chapter 11 bankruptcy as a stand-alone entity in December 2003.

Atmos Energy is the largest publicly traded, fully regulated, pure-play natural gas utility in the United States, serving more than 3 million customers in Texas, Colorado, Kansas, Kentucky, Louisiana, Mississippi, Tennessee, and Virginia. About two thirds of its earnings come from Texas, where it distributes natural gas in northern Texas and owns an intrastate gas pipeline spanning several key shale gas formations and interconnected with five storage facilities.