Beatrice Lang
There are several large companies that are big players in the electricity sector. Some of the largest electric utility companies in the United States include American Electric Power (AEP), Calpine Corp, Entergy Arkansas, and MidAmerican Energy. Outside of the US, Électricité de France SA (EDF), Engie, Enel SpA, and Iberdrola SA are also major electricity providers.
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What You'll Learn
American Electric Power (AEP)
The company is headquartered in Columbus, Ohio, and ranked 185th on the 2018 Fortune 500 list of the largest United States corporations by revenue. American Electric Power was formed in 1958, replacing the Electric Company of America, a holding company that had existed since 1899. In 1923, the company built the world's first plant to reheat steam for use in the electricity generation process at the Philo Power Plant in Philo, Ohio.
AEP owns the United States' largest electricity transmission system, a network spanning nearly 39,000 miles (63,000 km) and including 765 kilovolt ultra-high voltage transmission lines. This system provides about 10% of the electricity demand in the Eastern Interconnection, which covers 38 eastern and central U.S. states. AEP was the first utility to utilise 345 kV transmission lines in 1953.
In 2018, AEP announced plans to reduce carbon emissions by 80% by 2050 through increased use of renewables, natural gas, and energy efficiency. The company has also invested in electric vehicle infrastructure, with a $10 million program in Ohio to install up to 375 electric vehicle charging stations. However, AEP has faced legal issues related to environmental compliance, including a lawsuit filed by the United States Justice Department in 1999 for violating the Clean Air Act.
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Southern Company
In addition to its renewable energy assets, Southern Company also operates several gas plants across Alabama, Georgia, and North Carolina, with a total generating capacity of over 7,380 megawatts. The company's diverse energy portfolio has allowed it to power more than 1 million homes and businesses in Georgia with carbon-free, nuclear energy.
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Calpine Corp
Calpine's fleet of power plants in operation or under construction represents more than 26,000 to 27,000 megawatts of generation capacity. This capacity is enough to power approximately 20 million homes. Through wholesale power operations and retail businesses, Calpine serves customers in 22 states, Canada, and Mexico.
Calpine has a strong commitment to environmental responsibility and advancing ambitious climate goals. The company utilizes carbon capture and sequestration technologies to reduce its carbon footprint and promote clean energy solutions. In July 2023, Calpine announced a $25 million investment in carbon capture technology, further demonstrating its dedication to sustainability.
In January 2025, Constellation Energy, a leading producer of emissions-free electricity, agreed to acquire Calpine for $16.4 billion in a cash-and-stock deal. This acquisition created America's largest clean energy provider, with a combined customer base of 2.5 million and an expanded array of energy solutions. The merger of Constellation's expertise in zero-emission nuclear energy with Calpine's low-carbon natural gas and geothermal generation fleets resulted in a diverse and sustainable energy portfolio.
Calpine has experienced financial challenges in the past, filing for bankruptcy in 2005. However, the company emerged from bankruptcy in 2008 and has since made significant strides toward a cleaner energy future, contributing to its position as a significant player in the electricity industry.
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Électricité de France SA (EDF)
In 2004, EDF was privatized, although the government of France retained 84% equity. In 2017, EDF took over the majority of the reactor business Areva, in a French government-sponsored restructuring. In 2022, EDF agreed to acquire GE Steam Power's nuclear activities, which include the manufacture of non-nuclear equipment for new nuclear power plants and the maintenance and upgrade of existing nuclear power plants outside America. The acquisition was completed on 31 May 2024, and GE Power's nuclear business is now known as Arabelle Solutions.
EDF specializes in electricity, from engineering to distribution. The company's operations include electricity generation and distribution, power plant design, construction, and dismantling, energy trading, and transport. EDF is active in power generation technologies such as nuclear power, hydropower, wind power, solar energy, biomass, geothermal energy, and fossil-fired energy. EDF is committed to building a net-zero energy future with electricity and innovative solutions and services to help save the planet and drive well-being and economic development. EDF's production is currently 90% free from carbon dioxide emissions worldwide and 96% in France.
EDF has a wide range of customers and subsidiaries around the world. In the United Kingdom, EDF Energy generates about 20% of British electricity, mainly from 8 nuclear plants. EDF also has a presence in the United States, with subsidiaries like EDF-RE and Électricité de Strasbourg. EDF serves over 37 million customers worldwide and had a turnover of €63.34 billion in 2009.
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Enel SpA
In terms of financial performance, Enel SpA boasts a 17% return on equity (ROE), which is higher than the average in the electric utilities industry. This indicates that for every €1 worth of equity, the company earns €0.17 in profit. However, it is important to note that Enel SpA carries a significant amount of debt, with a debt-to-equity ratio of 1.45. While a high ROE can be attractive to investors, the company's high debt levels also increase risk and reduce future options.
When considering Enel SpA as a potential investment opportunity, it is essential to look beyond a single metric like ROE. A comprehensive analysis should take into account various factors, including the company's financial condition, risks, dividends, insider trades, and overall business quality. Enel SpA's high debt levels may be a cause for concern, but the company's superior ROE compared to industry averages is a positive indicator. A detailed evaluation of Enel SpA's stock value should consider fair value estimates, potential risks, and the broader context of the energy market.
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Frequently asked questions
Some of the largest electricity providers in the US include American Electric Power (AEP), Calpine Corp, Entergy, Exelon, MidAmerican Energy, and NRG Energy.
Outside of the US, major electricity companies include Électricité de France SA (EDF), Enel SpA, E.ON, Engie, Iberdrola SA, and Tokyo Electric Power Co. These companies have a presence in multiple countries across Europe, Latin America, and Asia.
Yes, Électricité de France SA (EDF) is a French state-owned company that provides power generation, transmission, distribution, and trading services. Another example is Hawaiian Electric Light Company (HELCO), which is a subsidiary of Hawaiian Electric Industries and serves the Island of Hawai'i.
State Grid Corporation of China is the largest utility company worldwide. Other major players include Southern Company, a US-based gas and electric utility holding company, and Enel SpA, a multinational power company with a presence in 30 countries.
