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Southern is one of the largest utilities in the U.S. 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.

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.

American Electric Power is one of the largest regulated utilities in the United States, providing electricity generation, transmission, and distribution to more than 5 million customers in 11 states. About 42% of AEP's of capacity is coal, with the remainder from a mix of natural gas (27%), renewable energy and hydro (21%), nuclear (8%), and demand response (2%). Vertically integrated utilities, transmission and distribution, and generation and marketing support earnings.

Brookfield Renewable is a globally diversified, multitechnology owner and operator of clean energy assets. The company’s portfolio consists of hydroelectric, wind, solar, and storage facilities in North America, South America, Europe, and Asia, and totals over 20 gigawatts of installed capacity. Brookfield Renewable invests in assets directly, as well as with institutional partners, joint venture partners, and through other arrangements. The company offers two separate listings for investors: Brookfield Renewable Partners LP and Brookfield Renewable Corporation.