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FirstEnergy is an investor-owned holding company with 10 regulated distribution utilities across six mid-Atlantic and Midwestern states. FirstEnergy also owns and operates one of the nation's largest electric transmission systems.

Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas in Missouri and Illinois. It serves 2.5 million electricity customers and approximately 1 million natural gas customers.

OGE Energy is a holding company for Oklahoma Gas & Electric, a regulated utility with electricity generation, transmission, and distribution to 900,000 customers in Oklahoma and western Arkansas. In December 2021, OGE divested its 25.5% stake in Enable Midstream Partners, an oil and gas services company it created in 2013 through a unit exchange merger with Energy Transfer. OGE sold its 95.4 million limited partner units of Energy Transfer throughout 2022. OGE sold its retail gas business in 1928 and no longer has any gas operations.

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 $86 billion.