ExxonMobil is the largest energy company in the United States based on revenue. In its 2024 fiscal year, the Texas-based oil and gas producer generated almost *** billion U.S. dollars in revenues. This was around 40 percent higher than the amount generated by Chevron, which ranked second. The largest energy companies in the United States were all involved in the fossil fuel industry.

Saudi Arabian Oil Company, also referred to as Saudi Aramco, generated more revenue than any other company within the global energy sector in the financial year 2024. The Saudi Arabian company reported revenues of *** billion U.S. dollars. China Petroleum and Chemical Corporation (Sinopec) ranked second, with *** billion U.S. dollars in revenue. Global energy sources In 2024, oil and gas multinational corporations dominated as the leading companies in terms of energy sales. Oil, natural gas, and coal are still the leading sources of primary energy consumption worldwide. By comparison, the revenue of the largest renewable energy companies in the world was below ** billion U.S. dollars. Their headquarters are mostly located in the United States and Europe. Global energy demand China not only boasted some of the world's largest energy conglomerates, but it also led the world in terms of energy consumption. However, per capita energy consumption was highest in the Middle Eastern countries of Qatar and the United Arab Emirates. Global energy consumption was projected to increase by ** percent by 2050, after growing by ** percent between 1990 and 2022.

NextEra Energy was the leading electric utility in the U.S. as of June 2024, based on market value, at almost *** billion U.S. dollars. Georgia-based electric utility Southern Company ranked second that same year, with a market value of ** billion dollars. A new age of energy company In addition to leading the ranking in the U.S., NextEra Energy was also the leading electric utility worldwide in terms of market value as of that month. Along with companies such as Iberdrola, Enel, Orsted, and EDF Energy, NextEra Energy is part of a new generation of energy giants nicknamed green supermajors. With large investments in renewable electricity capacity, these utilities have seen their market value soar recently, challenging established energy companies operating in the oil sector such as Chevron and Shell. Electric utilities in the United States Utilities provide the public with vital commodities or services such as power, natural gas, and water. In 2023, there were over ***** electricity providers operating in the U.S., of which cooperatives accounted for the largest share. While investor-owned utilities represented less than ** percent of electricity providers in the country that year, they usually serve the highest number of customers. In 2023, more than *** million customers were served by the U.S. electric industry.

Iberdrola, based in Spain, was considered the leading renewable energy company worldwide in March 2025, based on revenue, with more than ***** billion U.S. dollars as of March 2025. GE Vernova ranked second with more than ***** billion dollars of revenue.

NextEra Energy, headquartered in Florida, United States, was the largest electric utility company worldwide in June 2025, with a market value of ****** billion U.S. dollars. Ranking second, Spain's Iberdrola had a market value of ****** billion U.S. dollars. Global marketUtilities sell electricity through a regulated market by operating generation, transmission, and distribution facilities. In most countries, utilities provide electricity and are essential for many industrial and commercial enterprises, as well as households and other facilities such as recreational facilities. As the integration of renewable energy sources and investments in smart grid technologies are projected to raise a challenge, the basic utility’s business model is expected to undergo a major change. NextEra Energy Three of the top 10 utilities are based in the United States. NextEra Energy has been on the growth since the end of the COVID-19 crisis. Almost half of the electricity generated by this company came from natural gas.

In March 2025, NextEra Energy, a leading company in the generation of renewable energy worldwide, had a market capitalization of roughly *** billion U.S. dollars. GE Vernova and Iberdrola followed with a market capitalization of *** and *** billion U.S. dollars, respectively.

The nuclear energy companies in the world with the largest market capitalization were located in the United States and France. NextEra Energy, which was also the largest electric utility company in the world, ranked first with a market cap of some *** billion U.S. dollars.

Duke Energy was ranked as the largest gas and electric utility in the United States in 2024, based on revenue. The company generated approximately ***** billion U.S. dollars in the financial year 2024. The utility was also considered one of the largest electric utilities in the country based on market value and is headquartered in North Carolina. Southern Company followed second in the ranking, with revenue of ***** billion U.S. dollars. Duke Energy as a utility In 2024, electric utilities and infrastructure constituted the vast majority of Duke Energy's operating revenue by segment. The electric and gas utility supplies energy to North and South Carolina, Florida, Ohio, and Indiana. Duke Energy sales amounted to over *** terawatt-hours in 2024, the largest share coming from the utility subdivisions Duke Energy Carolinas and Duke Energy Progress, supplying electricity to Carolina and Florida. What do utilities do? A utility maintains the infrastructure that provides a public service, such as electricity and water, and is regulated by public entities ranging from local community groups to statewide government monopolies. An electric utility is generally involved in the generation and distribution of electricity for sale to customers. Globally, U.S. based Sempra Energy is one of the largest natural gas utilities with a market value of ***** billion U.S. dollars as of May 2023.

Royal Dutch Shell has the greatest total assets of any energy company in the world. As of 2019, it had accumulated some ***** billion U.S. dollars worth of total assets. The state-owned petrochemical company PetroChina followed with total assets of ***** billion U.S. dollars.

E.ON was ranked first among the world's leading electric utilities companies in 2025, with annual sales of almost ** billion U.S. dollars. Italy's Enel followed, with sales revenue of almost ** billion U.S. dollars. What is an electric utility? Electric utilities are companies involved in the provision of electricity to customers. An electric utility company can be involved in one or more of the steps included in this process, namely generation, transmission, and distribution of electricity. Recent years have seen utility companies across the globe increasing their utilization of renewable energy sources. The largest renewable energy companies worldwide are located in the United States and Europe. European utilities leading the pack Six out of the top 10 leading electric utilities based on sales are located in Europe. E.ON, headquartered in Germany, had annual sales of approximately ***** billion U.S. dollars as of June 17, 2025. The British branch of E.ON is a member of the Big Six in the UK.

ExxonMobil ranks first among the United States' top ten oil and gas producing companies based on market capitalization. As of June 18, 2025, the Texas-based oil supermajor had a market cap of ****** billion U.S. dollars. ExxonMobil can not only trace its roots back to the early years of commercial oil production, it has also become one of the largest oil and gas companies in the world. It is active in all areas of the supply chain, from hydrocarbon extraction to retailing of gasoline. What is market cap? As opposed to sales or assets, market capitalization is a metric used to determine a company’s size by the worth of their outstanding shares on the stock market. ExxonMobil often ranks as the leading oil and gas company based on market cap worldwide. However, its net income is often significantly lower than that of state-owned entities such as Saudi Aramco. The differing ratios exemplify how market cap is not a hard figure like net profits, but inflates and fluctuates according to the perceived value of a company, influenced by less quantifiable factors. The role of oil and gas in the world economy The oil and gas industry is involved in exploration, extraction, refining, transport, and marketing of hydrocarbons. Many industries are extremely dependent on oil and gas products, mostly in the form of fuels or raw materials for chemical products. The oil and gas industry is one of the largest worldwide, and it would follow that companies involved within the industry are among the top companies worldwide by revenue.

According to a survey conducted in January 2021, the U.S. clean energy company stock expected to increase the most over the next year is Plug Power Inc. Plug garnered the most support, with ** percent of respondents expecting the company's stock price to grow the most by 2022. Of the remaining respondents, ** percent and ** percent expected the stock price of FuelCell and Blink Charging, respectively, to grow the most by 2022.

Saudi Arabian Oil Co, commonly referred to as Saudi Aramco, is the leading energy company by profits worldwide. In the 2020/21 fiscal year, the state-owned hydrocarbon producer generated over ** billion U.S. dollars in profits. This was significantly more than the profits made by the second-ranking Russian Surgurtneftegas. Most companies with large profits in 2020 were state-owned enterprises as they were partially supported by their government during the coronavirus pandemic and resulting oil crisis.

Saudi Arabian oil industry Saudi Arabia is among the worldwide export leaders in the oil industry. In 2020, the Saudi Arabia’s oil sector GDP reached *** billion Saudi riyals. Saudi Arabian Oil Company is headquartered in the city of Dhahran, with operations including exploration, production, refining, chemicals, distribution, and marketing of hydrocarbons. The company is not only the leading energy company by profits, but also the world’s biggest oil producer, with a daily oil production of ** million barrels in 2020.

Natural gas industry While Saudi Arabia is the greater oil producer globally, Russia is one of the largest natural gas producers, accounting for nearly ** percent of the total global natural gas production in 2020. Gazprom is not among the leading global companies by profits in the fiscal year 2020/21. However, the majorly state-owned company held roughly ** percent of Russia's gas production in 2020. At that same year, Gazprom recorded net sales of *** billion U.S. dollars.

In 2020, eight out of the ten largest revenue-generating electricity companies in Latin America were located in Brazil, including Spanish Iberdrola and Italian Enel's subsidiaries in the South American country. Nevertheless, the ranking was topped by a large margin that year by Mexico's state-owned electric utility, with a revenue of more than 25 billion U.S. dollars.

As of **********, EGAT generated a revenue of around **** billion U.S. dollars, which was the highest among other electricity, oil, and gas manufacturing companies. This was followed by the Thai Oil Group with a revenue of approximately **** billion U.S. dollars.

Uniper is the leading global utility company based on net income. As of *************, the German gas, water, and multi-utilities company had a net income of some ** billion U.S. dollars. In the second position was Nextera Energy, a United States-based power utility company with a net income of around ***** billion U.S. dollars.

Gazprom was the highest earning energy company in Russia and one of the leading energy companies worldwide. n 2021, Gazprom earned ***** billion U.S. dollars, **** billion U.S. dollars more than Lukoil. The leading electricity provider in the country was Rosseti, whose revenue reached ** billion U.S. dollars in 2021.

Of the leading ten technology companies worldwide based on market capitalization, Samsung is the company consuming the most electricity at nearly ** million megawatt-hours (MWh) based on the company's most recent 2023 figures. Google, Taiwan Semiconductor Manufacturing Company (TSMC), and Microsoft came in second, third, and fourth place in electricity consumption, respectively.

Florida Power & Light Company was the electric utility with the highest number of customers in the United States in 2023. That year, it served approximately 5.8 million customers. Southern California Edison Company came in second, with 3.7 million customers. Florida Power & Light is a subsidiary of NextEra Energy, the largest energy holding company in the country, and is considered one of the new energy majors due to its great investments in renewable energy. NextEra Energy has one of the highest customer satisfaction scores of investor-owned utilities in the U.S. Utility ownership in the United States Around one-third of electricity providers in the United States are cooperatives, while a little less than 30 percent are municipal utilities. Although municipal and cooperative utilities greatly outnumber investor-owned utilities (IOUs) in the U.S., IOUs serve the highest number of customers. This is because municipal and cooperative utilities are much smaller and locally based, generally operating not for profit and without commercial incentive to expand. Largest companies in the United States and revenue Florida Power & Light and Southern California Edison are also the two largest IOUs in the U.S. and generated some of the highest commercial revenue among leading electric utilities in 2023. While Virginia Electric and Power had a lower number of customers, it ranked highly for commercial revenue, above many larger companies.

In 2024, NextEra Energy had total assets of over ****** billion U.S. dollars. That same year, Duke Energy's total assets stood at some ****** billion dollars.