Otis Singleton
The world's largest electricity companies play a crucial role in modern society, with electricity accounting for 21% of energy use in the EU in 2022. This figure is expected to grow as cities, states, and countries transition to more sustainable energy sources. The biggest electric companies in the world include NextEra Energy, EDF, Enel Energy, Iberdrola, and the State Grid Corporation of China. These companies have massive global reach and serve millions of customers. They are also valued at billions of dollars and contribute significantly to the total market cap of publicly traded companies worldwide.
| Characteristics | Values |
|---|---|
| Number of electric utility companies in the US | 1,600 |
| Number of utility companies delivering electricity to the vast majority of Texas | 4 |
| Largest electric utility provider in Texas | Oncor |
| Number of customers served by Oncor | Over 10 million |
| Number of customers served by AEP Texas | Over 1 million |
| Number of customers served by Texas-New Mexico Power | 260,000+ |
| Largest electric utility company in the US by market capitalization | NextEra |
| Number of customers served by Exelon | Over 10 million |
| Number of customers served by Duke Energy | 8.2 million |
| Number of customers served by Pacific Gas & Electric | 5.5 million |
| Number of customers served by MidAmerican Energy | Nearly 1.6 million |
| Number of power plants operated by Calpine Corp | 76 |
| Generation capacity of Calpine Corp | Over 26,000 megawatts |
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What You'll Learn
- Calpine Corp: a large generator of electricity from natural gas and geothermal resources
- Exelon: the nation's leading energy provider, serving over 10 million customers
- Southern Company: one of the biggest electric power companies, focusing on new nuclear and renewables
- Pacific Gas & Electric: one of the oldest electric supply companies, serving 5.5 million customers
- Texas utility companies: four utility companies deliver electricity to the majority of the state
Calpine Corp: a large generator of electricity from natural gas and geothermal resources
Calpine Corp, one of the largest US electric utility companies, is a major generator of electricity from natural gas and geothermal resources. With a fleet of 76 power plants in operation or under construction, Calpine has a generation capacity of over 26,000 megawatts—enough to power approximately 20 million homes. The company serves customers in 22 states, Canada, and Mexico through its wholesale power operations and retail businesses, Calpine Energy Solutions and Champion Energy.
Calpine operates the largest geothermal facility in the world, The Geysers, which is located in a geothermal field outside Sonoma, California. This facility alone supplies about 50% of California's in-state geothermal power, producing 725 megawatts of electricity sufficient to power 725,000 homes or a city the size of San Francisco. In addition to The Geysers, Calpine has 79 energy facilities in operation across North America, leveraging its expertise and geographic diversity to deliver clean and reliable power.
Calpine has been an industry leader in power generation for over 40 years, with a strong commitment to sustainability and innovation. The company operates the nation's largest fleet of F-frame combustion turbines and combined heat and power technology. Calpine is also a pioneer in carbon capture and sequestration technologies, with a $25 million investment in a project that could capture 95% of a plant's carbon emissions, significantly reducing greenhouse emissions. Additionally, Calpine is investing in one of the world's largest grid-connected battery systems to ensure the power grid remains operational during peak periods while integrating renewables.
Looking to the future, Calpine has announced plans for a 425 MW natural gas-fired plant in Freestone County, Texas, and is actively pursuing decarbonization through cost-effective pathways. The company optimizes and modernizes its assets to maintain its fleet's efficiency, utilizing flexible plants and battery storage systems to stabilize the grid. Calpine's deep technological experience, safety-first approach, and commitment to meeting customer needs have solidified its position as America's premier competitive power company.
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Exelon: the nation's leading energy provider, serving over 10 million customers
Exelon is the United States' leading energy provider, serving over 10 million customers. It is one of the nation's largest utility companies, operating across a large urban footprint. Exelon serves major metropolitan areas in Delaware, the District of Columbia, Illinois, Maryland, New Jersey, and Pennsylvania. The company ranks high in customer satisfaction and focuses on modernizing its energy infrastructure.
Exelon works to advance clean and affordable energy through initiatives such as its Climate Change Investment Initiative and other charitable giving. It is committed to sustainability and innovation, constantly working to improve its processes and reduce its environmental impact. This includes investing in the generation of wind and solar energy, as well as exploring zero-emission power generation technologies like hydrogen and advanced nuclear.
Exelon has a strong presence in the energy industry, with a history of reliable service and a dedication to meeting the needs of its customers. The company has a large and diverse customer base, serving both residential and commercial clients. Exelon's success and leadership in the energy sector can be attributed to its focus on modernization, sustainability, and customer satisfaction, solidifying its position as one of the biggest electric companies in the nation.
Exelon's efforts to advance clean and affordable energy are particularly noteworthy. Through its initiatives, the company is actively contributing to the transition towards a more sustainable energy landscape. By investing in renewable energy sources and exploring advanced technologies, Exelon is not only reducing its carbon footprint but also shaping the future of energy. The company's commitment to sustainability is further demonstrated by its high ranking in customer satisfaction, indicating that its efforts are recognized and valued by its extensive customer base.
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Southern Company: one of the biggest electric power companies, focusing on new nuclear and renewables
Southern Company is one of the largest electricity producers in the United States and the biggest wholesale electricity provider in the Southeast. The company serves around 9 million customers and businesses across the country, with electricity utilities in three states and natural gas distribution utilities in four.
Southern Company's subsidiaries operate hydroelectric, gas, coal, and nuclear generation sources to generate approximately 200 terawatt-hours of electricity. In 2016, Southern Company acquired PowerSecure, a distributed energy infrastructure technologies company, and AGL Resources (renamed Southern Company Gas). This merger doubled the company's customer base and expanded its business scope by increasing its natural gas presence.
Southern Company has a significant focus on nuclear energy and renewables. In 2011, the company, in collaboration with Turner Renewable Energy, purchased a 30 MW solar project in Cimarron, New Mexico. In 2012, the company began operating the Nacogdoches Generating Facility, a 115 MW biomass-fueled electric generating plant in Texas. Southern Company also owns and operates several nuclear power plants, including the Farley, Hatch, and Vogtle nuclear power plants. In 2023, Southern Company's subsidiary, Southern Power, acquired the 200MW Millers Branch Solar Facility in Texas.
While Southern Company has made strides in renewable energy, it has also faced criticism for its historical funding of climate change denial. Between 1993 and 2004, the company paid over $62 million to organizations spreading disinformation about climate change. However, more recently, Southern Company has been transitioning away from coal-based generation, with a notable drop from 70% between 2005 and 2008 to 30% by 2017.
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Pacific Gas & Electric: one of the oldest electric supply companies, serving 5.5 million customers
Pacific Gas & Electric, commonly abbreviated to PG&E, is one of the oldest electric supply companies in the United States. The company was established on 10 October 1905, from the merger and consolidation of various predecessor utility companies. By 1984, PG&E had become the United States' "largest electric utility business".
PG&E is headquartered at the Kaiser Center in Oakland, California. It provides natural gas and electricity to 5.2 million households across the northern two-thirds of California, from Bakersfield and northern Santa Barbara County, almost reaching the Oregon and Nevada state lines. The company is overseen by the California Public Utilities Commission and is the leading subsidiary of the holding company PG&E Corporation, which has a market capitalization of $34.9 billion as of March 10, 2025.
PG&E's history can be traced back to the late 19th century, when the demand for electric light in downtown San Francisco's stores and factories was growing. The first electric street light was erected in 1888 in front of City Hall, and the electrical grid supporting it gradually expanded. In 1888, the California Electric Light Company constructed a second generating station to increase production capacity.
In 1899, John Martin and Eugene de Sabla formed the Yuba Power Company, and in 1900 they created the Bay Counties Power Company, constructing a 140-mile transmission line for an electric railway in Oakland. In 1903, Martin and de Sabla started the California Gas & Electric Company to acquire and merge gas and electric power businesses. They purchased several utilities, including the Oakland Gas Light & Heat Company and the United Gas & Electric Company. Finally, in 1905, they merged with the San Francisco Gas & Electric Company to form the Pacific Gas and Electric Company. This merger gave the new company access to the large San Francisco market and allowed it to reinforce its electric system, replacing the previously used steam-operated generating plants with lower-cost hydroelectric power.
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Texas utility companies: four utility companies deliver electricity to the majority of the state
Texas has a deregulated electricity market, which means that consumers can choose their Retail Electric Provider (REP). This has introduced competition into the market, with companies vying to offer the best rates and plan features to suit a range of consumer needs.
The four largest utility companies in Texas are Oncor Electric Delivery Company, CenterPoint Energy, TXU Energy, and Reliant Energy. These companies are responsible for delivering electricity to the majority of the state.
Oncor is the largest transmission and distribution utility in Texas, covering a vast service area and operating over 134,000 miles of power lines. They are a critical link in the electricity supply chain, delivering electricity to homes and businesses. CenterPoint Energy is another significant player in the Texas energy market, also responsible for the transmission and distribution of electricity.
TXU Energy is a leading Texas electricity company, serving over two million residents and businesses. They offer a range of plans, including month-to-month and prepaid options, with online dashboards to monitor usage. TXU also provides a 60-day satisfaction guarantee, making it a reliable choice for those moving to or within Texas.
Reliant Energy is another top power company in Texas, known for its high-quality customer service. They offer 24-hour customer support and a 60-day satisfaction guarantee, as well as various plan options to suit different customer needs.
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Frequently asked questions
Some of the biggest electric companies in the world include:
- Enel SpA: An Italian multinational power company with a presence in 30 countries and a focus on Europe and Latin America.
- Électricité de France SA (EDF): A French electric utility company that serves more than 35 million customers worldwide.
- Engie: A French electric utility firm and the biggest independent electricity producer in the world.
- State Grid Corporation of China (SGCC): The world's biggest power company by revenue, serving over 1.1 billion people in China.
Some of the biggest electric companies in the US are:
- American Electric Power (AEP): One of the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity.
- NextEra Energy: The world's largest electric utility holding company by market capitalization, with a valuation of over $120 billion as of November 2023.
- Southern Company: An American gas and electric utility holding company based in the southern US.
- Exelon: One of the nation's largest utility companies, serving major metropolitan areas across the country.
Some of the biggest electric companies in Europe include:
- E.ON: A Germany-based international energy supplier with operations across Europe, focusing on power and gas distribution.
- Iberdrola: A company operating in Spain, the US, Brazil, Mexico, and the UK, with a focus on renewable energy generation.
Some of the biggest electric companies in Asia include:
- Tokyo Electron: Headquartered in Japan, this company was ranked as the second-largest electric utility company in the world in 2024, with a market value of $107.5 billion.
- Tokyo Electric Power Co Holdings: A large Japanese electric company.
- Korea Electric Power Corp (KEP): A prominent South Korean electric company.
