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Edison International is the parent company of Southern California Edison, an electric utility that distributes electricity to 5 million customers in a 50,000-square-mile area of Southern California, excluding Los Angeles. Edison Energy owns interests in nonutility businesses that deal in energy-related products and services. In 2014, Edison International sold its wholesale power generation subsidiary Edison Mission Energy out of bankruptcy to NRG Energy.

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.

National Grid owns and operates the electric transmission system in England and Wales. It sold the bulk of its UK gas transmission business in fiscal 2023 to fund the acquisition of PPL's UK power distribution assets. In the Northeastern United States, it serves 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 UK, and the Grain (UK) liquefied natural gas facility.

Essential Utilities Inc., formerly Aqua America, Inc., operates regulated utilities that provide water, wastewater, and natural gas services in the United States, with subsidiaries serving approximately six million people in Pennsylvania, Ohio, North Carolina, Illinois, Texas, New Jersey, Indiana, Kentucky, and Virginia. In addition to its water/wastewater utilities, the company purchased the Peoples natural gas distribution utility in March 2020. Headquartered in Pennsylvania, WTRG is the one of the largest regulated water utilities in the U.S. and has been in operation for over 135 years. The company has over 3,200 employees. The shares are a component of the S&P 400 Midcap Index.