Top 10: Nuclear Energy Companies
The International Energy Agency (IEA) says that nuclear energy can help to make the energy sector's transition to sustainable power faster and more secure.
Intermittent energy sources, like wind and solar, will require support from stable energy sources to prevent power outages dependent on weather conditions.
Nuclear is a power source that can provide this steady energy supply without producing carbon emissions like fossil fuels.
"Achieving net zero globally will be harder without nuclear," the IEA says.
Sustainability Magazine has ranked 10 of the top nuclear energy companies.
10. NextEra Energy
Headquarters: Florida, US
Founded: 1925
Chief Nuclear Officer: Bob Coffey
Nuclear capacity: 6.2 GW
NextEra Energy describes itself as a leading force in energy solutions. It has a 72 GW operating portfolio, of which 8% is nuclear power. By 2045, the company aims to use 16% nuclear power to support energy from solar, battery storage and clean fuels.
“We are dedicated to operational excellence across every technology and to continuous improvement in safety and operational efficiency,” said NextEra Energy Chairman and CEO John Ketchum in its 2024 Sustainability Report.
“We know what each technology costs and what we can do to operate each one cost-effectively. We are pushing forward the frontiers of knowledge in all parts of the power generation value chain.”
9. Tennessee Valley Authority
Headquarters: Tennessee, US
Founded: 1933
Chief Sustainability Officer: Michael McCall
Nuclear capacity: 8.3 GW
Tennessee Valley Authority (TVA) says that its nuclear plants generate enough energy to power around a third of its customers. It is the largest public energy provider in the US and provides electricity to approximately 10 million people.
It operates three nuclear plants, two in Tennessee and one in Alabama, with a total of seven units.
The company anticipates it will invest nearly US$16bn over the next several years to meet increasing power demand and grow the nuclear supply chain.
“The strongest economy in the world will set the global agenda, and we want to ensure that the United States has the strongest economy,” said Jeff Lyash, TVA’s President and CEO.
8. Vistra Corp
Headquarters: Texas, US
Founded: 2016
Chief Strategy & Sustainability Officer: Stacey Doré
Nuclear capacity: 6.4 GW
Vistra Corp is responsible for four nuclear power plants in the US, including two in Ohio, one in Texas and one in Philadelphia.
It says it has around 7.8 GW of zero carbon generation currently online and expects to retire around 5.4 GW of fossil powered plants by 2027.
"With power demand rising, our team at Vistra remains steadfast in our commitment to reliably power American homes and businesses, providing a critical foundation for the US economy," said Jim Burke, President and CEO of Vistra, on the announcement of its 2025 Q2 results.
7. Duke Energy
Headquarters: North Carolina, US
Founded: 1904
SVP & Chief Nuclear Officer: Kelvin Henderson
Nuclear capacity: 10.7 GW
Duke Energy operates 11 nuclear units at six sites in North Carolina and South Carolina, US.
The business has submitted a license renewal application for its Robinson Nuclear Plant in South Carolina which it says will support growing energy demand and keep costs as low as possible.
“Renewing Robinson’s operating license for a second time is a critical step in our commitment to providing reliable, always-on, cost-competitive power for our customers,” said Kelvin Henderson, Senior Vice President and Chief Nuclear Officer at Duke Energy.
“This extension will allow us to continue supporting our company’s energy transformation and contributing to the local economy for decades to come.”
6. Constellation Energy
Headquarters: Maryland, US
Founded: 1816
EVP & Chief Generation Officer: Bryan Hanson
Nuclear capacity: 10.7 GW
Constellation says that it operates the largest fleet of nuclear plants in the US.
In September 2024, it announced the signing of a 20 year power purchase agreement with Microsoft that set up the launch of the restart of Three Mile Island Unit 1, to be known as the Crane Clean Energy Center.
“Today we begin a new chapter for reliable, emissions-free nuclear energy, returning thousands of good jobs and billions in economic opportunities for Pennsylvania families and businesses,” said Joe Dominguez, Constellation’s President and CEO, on announcing the facility’s restart date.
5. China National Nuclear Corporation
Headquarters: Beijing, China
Founded: 1955
Chairman: Shen Yanfeng
Nuclear capacity: 23.75 GW
The China National Nuclear Corporation (CNNC) is a state-owned enterprise and the top contractor of nuclear engineering projects in China.
CNNC says it aims to be a leading company of nuclear science and technology development in the world.
In 2024, the first overseas nuclear power unit built with Chinese-developed Hualong-1 technology met final acceptance requirements in Pakistan. “It will inject new momentum into nuclear energy cooperation and the iron friendship between China and Pakistan,” the company says.
4. Korea Electric Power Corporation
Headquarters: Naju-si, South Korea
Founded: 1898
EVP of Global & Nuclear Business Division: Lee Heung-joo
Nuclear capacity: 24.7 GW
Korea Electric Power Corporation (KEPCO) operates nuclear power stations in South Korea. In FY2023, it generated 22.25 billion kWh of nuclear power and it aims to reach 49 billion kWh.
In its 2024 ESG Report, Makoto Arako, Representative Executive Officer and Vice President, said: “Going forward, we will push ahead with initiatives that respond to changes in the business environment and in stakeholder expectations and requests, and to help make society more sustainable. Equally, we will work proactively to provide information on those initiatives.”
3. ROSATOM
Headquarters: Moscow, Russia
Founded: 2007
Director General: Alexey Likhachev
Nuclear capacity: 29.4 GW
ROSATOM is a Russian state corporation specialised in nuclear energy and comprises more than 350 enterprises.
“The sustainability agenda is an integral part of ROSATOM’s strategy,” said Alexey Likhachev, Director General of ROSATOM, in its 2024 ESG report.
“ROSATOM is a major high-technology company and a global leader in the nuclear industry. Today, this leadership is made possible by the green component, compliance of all our projects with the highest environmental and social responsibility standards and the Corporation’s extensive footprint in Russia and on overseas markets in more than 60 countries globally.”
2. China General Nuclear
Headquarters: Shenzhen, China
Founded: 1994
Executive Director and President: Gao Ligang
Nuclear capacity: 31.76 GW
China General Nuclear Power Group (CGN) is a Chinese state-owned energy corporation and is the country’s biggest domestic nuclear power operator with more than 50% of the domestic market.
It operates nuclear plants including the Daya Bay Nuclear Power Plant, Ling Ao Nuclear Power Plant, Hongyanhe Nuclear Power Plant and Ningde Nuclear Power Plant.
The Ningde facility is undergoing expansion with the addition of two Hualong One reactors. The first concrete was poured for the fifth unit in July 2024 and it is planned to be connected to the grid in 2029. A sixth unit is also planned.
After completion, Units 5 and 6 will bring the Ningde plant to a total nameplate capacity of roughly 6.5 GW.
1. EDF
Headquarters: Paris, France
Founded: 1946
Chief Impact Officer: Carine de Boissezon
Nuclear capacity: 72.9 GW
EDF says it is expanding its range of nuclear reactors of various sizes to meet the specific needs of countries and electricity networks around the world.
The company has invested in Sizewell C in the UK, a nuclear facility set to have a capacity of 3.2 GW. The company first put forward proposals for the facility in 2012 and the UK Government gave the project the green light in July 2025.
Julia Pyke and Nigel Cann, Joint-Managing Directors of Sizewell C, said that the investment decision “marks the start of an exciting new chapter for Sizewell C, the UK’s first British-owned nuclear power plant in more than 30 years.
“It’s a privilege to be leading a project that will create over 10,000 jobs, secure Britain’s energy future and revitalise the UK’s nuclear industry. We aim to showcase British infrastructure at its best – delivering a cleaner, more secure energy future for generations to come.”
