World Largest and Top Nuclear Power Companies List by Market Cap of July 2023

EDF (ELECTRICITE DE FRANCE) is Electricity Generation and Electric Utility company with headquarters in France mainly from nuclear power and renewable energy.

EDF Energy Holdings Limited and subsidiaries make up EDF Energy. The companies' principal activities are to provide and supply electricity and gas to commercial, residential and industrial customers, and to generate electricity through a portfolio of generation assets including nuclear, coal fired, gas and renewable generation. EDF Energy is also involved in the construction of new build nuclear assets.

ENI S.P.A. is Oil and Gas company with headquarters in Rome, Italy.

Exelon Corporation is Energy and Power Generation company with headquarters in USA. They have nuclear power plants in USA to generate nuclear energy.Exelon is the nation’s largest utility company, serving more than 10 million customers.

EXELON CORPORATION have six fully regulated transmission and distribution utilities, They are:

• Atlantic City Electric (ACE).
• Baltimore Gas and Electric (BGE).
• Commonwealth Edison (ComEd).
• Delmarva Power & Light (DPL).
• PECO Energy Company (PECO).
• Potomac Electric Power Company (Pepco). 

EXELON CORPORATION annual revenue generated for period ending Dec-2021  was 36,347 million USD.

CEZ A.S supplies electricity and gas to the households of CZech Republic at relatively low price. Headquarters is in Czech Republic.

Nuclear power generation company with headquarters in Shenzhen, China.

Cameco Corporation is a Nuclear Energy and Mining company. It is a leading supplier of uranium refining, conversion and fuel manufacturing services. The company produce more than 53 million pounds of uranium concentrates annually backed by 461 million pounds of proven and probable mineral reserves. The headquarters is in Canada.

Electricity generation and Electric Utility Company with headquarters in Japan.

NRG ENERGY is Nuclear power generation company with headquarters in Texas, USA.

National Atomic Company Kazatomprom is the national operator of the Republic of Kazakhstan for the import and export of uranium, rare metals, nuclear fuel for nuclear power plants company. It involved in the front end of the nuclear fuel cycle from geological exploration, uranium mining and production of nuclear fuel cycle through to scientific research and development of patented technologies. The headquarters is in Kazakhstan.