The 12 closest competitors and alternatives to TerraPower among nuclear energy companies — ranked by similarity to what TerraPower actually does, not by market-cap band.
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TerraPower, LLC is an American nuclear reactor design and development engineering company headquartered in Bellevue, Washington.
TerraPower is a nuclear energy company headquartered in United States, founded in 2008. Its most recent funding round raised $650M in June 2025. Xcout tracks 29 named people at TerraPower, including Chris Levesque (PRESIDENT AND CEO).
23 more named people on record for TerraPower, with roles, board committees and tenure — see the full roster →
Every round on record:
| Date | Round | Amount | Investors |
|---|---|---|---|
| — | $650M | 4 named |
Who invested in each round, lead investors, valuations and the co-investor graph — open the full funding history →
Ranked by semantic similarity — how close each company is to TerraPower by what it does, using Xcout's live company graph. Click any company for its full profile, or its competitor set.
Energy
Kairos Power LLC is an American nuclear energy company founded in 2016 that is developing fluoride salt-cooled high-temperature reactors (FHRs), a type of molten-salt reactor, in a small modular reactor (SMR) form factor.
Energy
ZettaJoule is an advanced small modular reactor company developing on-site nuclear reactors designed to provide clean heat, electricity, and hydrogen for energy-intensive industries. Operating in the United States and Japan, the company aims to deliver reliable, zero-carbon energy solutions operating at temperatures up to 950°C.
Energy
Copenhagen Atomics is a Danish engineering company headquartered in Denmark, founded in 2014. It focuses on developing molten salt reactors powered by thorium.
Nuclear Energy Technology
Lightbridge Corporation, alongside its affiliated entities, specializes in the innovation and advancement of nuclear fuel technology, marketed under the "Lightbridge Fuel" brand. The company's core mission involves the creation and commercialization of advanced metallic nuclear fuels. These fuels are engineered to improve the durability and safety of nuclear energy generation in both current and future reactor designs, ultimately aiming to make a significant contribution to combating climate change and reducing atmospheric pollutants. Established initially as Thorium Power, Ltd., the organization rebranded as Lightbridge Corporation in September 2009. The company's headquarters are situated in Reston, Virginia.
Energy
Standard Nuclear, Inc. is a reactor-agnostic producer of TRISO nuclear fuel, designing and manufacturing advanced nuclear fuels for next-generation reactors to support U.S. energy security. The company is the only independent U.S. manufacturer of TRISO fuel, a robust, high-performance fuel essential to advanced nuclear reactors. It aims to supply advanced fuels to the next-generation nuclear industry and deliver radioisotope power solutions.
Energy
NuScale Power Corporation specializes in the development and sale of modular light water reactor nuclear power facilities. These innovative plants are designed to provide energy for a wide array of applications, including the generation of electricity, district heating systems, water desalination, hydrogen production, and various industrial heat processes. Key products in their portfolio include the NuScale Power Module, an individual water reactor unit capable of producing 77 megawatts of electricity (MWe). They also offer the VOYGR-12 power plant, which delivers a substantial 924 MWe, along with four-module VOYGR-4 and six-module VOYGR-6 configurations. Beyond these standard offerings, NuScale provides other adaptable configurations tailored to meet specific customer demands. Established in 2007, the company maintains its headquarters in Portland, Oregon, and operates as a subsidiary of Fluor Enterprises, Inc.
Energy
Oklo Inc. is a publicly traded American nuclear power company based in Santa Clara, California. The company develops a small modular nuclear reactor, the Aurora Powerhouse, and intends to sell both electricity and radioisotopes produced by their Aurora reactors. The company's name is derived from Oklo, a region in the country of Gabon, Africa, where self-sustaining nuclear fission reactions occurred approximately 1.7 billion years ago.
Energy
X-Energy, Inc. operates within the energy sector, primarily focusing its efforts on the development of modular nuclear reactors and cutting-edge fuel technology to enable clean energy production. This company was established in 2009 by co-founders Kam Ghaffarian and Eben Mulder, and its main corporate offices are situated in Rockville, Maryland.
Energy
Antares Nuclear, Inc. is a United States-based company specializing in factory-produced fission microreactors. It is expanding its headquarters, known as Antares Prime, in California to support reactor development, manufacturing, and regulatory milestones.
Similar nuclear energy company
The Earthineering Company develops nuclear reactors specifically designed to supply heat for various industrial applications beyond electricity generation. The company aims to provide reliable nuclear energy solutions tailored to energy consumption needs across multiple industries.
Energy
The Nuclear Company is an AI tech-startup operating in the nuclear and energy space that pioneers a fleet-scale approach to building and developing advanced energy solutions.
Energy
Helion Energy, Inc. is an American fusion research company located in Everett, Washington. It is developing a magneto-inertial fusion technology to produce fusion power by combining deuterium with helium-3 via aneutronic fusion.
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