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

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.

Essential Utilities is a Pennsylvania-based holding company for US water, wastewater, and natural gas distribution utilities. The company's water business serves 3 million people in eight states. Its largest service territory is in Pennsylvania, primarily suburban Philadelphia. Its Peoples subsidiary serves more than 740,000 gas distribution customers in Pennsylvania and Kentucky. It completed the sale of its West Virginia gas utility and the bulk of its nonregulated assets in 2024.

Duke Energy is one of the largest electric power holding company in the U.S. At the end of 2024, the utility had a net value of property and equipment assets of about $123 billion. For 2024, revenues were about $30 billion, with regulated electricity accounting for about 92% of the total. After the sale of its commercial renewables business in 2023, it became a fully regulated utility company. It serves approximately 8.4 million electric customers in six states in the Southeast and Midwest, and 1.7 million natural gas customers. Duke also has one of the largest regulated nuclear generation fleet in the U.S., with six nuclear generators in North and South Carolina. Duke is focusing expansion on transmission and renewable generation. It plans to own or purchase 16,000 megawatts of renewable energy capacity by 2025 and to eliminate coal usage by 2050. At the end of 4Q24, the company's generation fuel mix was about 15% coal, 45% natural gas, 37% nuclear, and 3% renewables. DUK shares are a component of the S&P 500 and its market cap is about $93 billion.