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Top 34 Nuclear Energy startups
Oct 04, 2025 | By Alexander Gillet | 22 |
Nuclear energy startups are developing new technologies and advanced reactor designs, such as small modular reactors (SMRs), molten salt reactors (MSRs), to enhance safety, efficiency and waste management in the nuclear power industry.
1
Country: USA | Funding: $94.9M
Zeno is developing next-generation radioisotope power systems that generate carbon-free, resilient power for decades.
Zeno is developing next-generation radioisotope power systems that generate carbon-free, resilient power for decades.
2
Country: USA | Funding: $1.4B
TerraPower focuses on developing a sustainable and economic nuclear energy system while reducing proliferation risks.
TerraPower focuses on developing a sustainable and economic nuclear energy system while reducing proliferation risks.
3
Country: USA | Funding: $1B
X-energy is a nuclear reactor & fuel design engineering company.
X-energy is a nuclear reactor & fuel design engineering company.
4
Country: France | Funding: €900M
Orano is focusing its attention on the recovery of nuclear materials and the management of nuclear waste to generate safe, low-carbon electricity. With significant expertise in the nuclear fuel cycle, they offer customers tailor-made solutions for every stage of nuclear power generation, from mining, conversion, enrichment, recycling, logistics, and engineering to decommissioning and dismantling.
Orano is focusing its attention on the recovery of nuclear materials and the management of nuclear waste to generate safe, low-carbon electricity. With significant expertise in the nuclear fuel cycle, they offer customers tailor-made solutions for every stage of nuclear power generation, from mining, conversion, enrichment, recycling, logistics, and engineering to decommissioning and dismantling.
5
Country: USA | Funding: $900M
Pacific Fusion focuses on renewable energy generation, emphasizing affordable fusion power inspired by nature.
Pacific Fusion focuses on renewable energy generation, emphasizing affordable fusion power inspired by nature.
6
Country: UK | Funding: $677.1M
Newcleo is developing the latest generation of nuclear reactors providing a path to combatting both climate change and existing nuclear waste. It is working on so-called Small Modular Reactors (SMRs) and wants to use so-called MOX technology to make it possible to recycle spent uranium from conventional nuclear power plants.
Newcleo is developing the latest generation of nuclear reactors providing a path to combatting both climate change and existing nuclear waste. It is working on so-called Small Modular Reactors (SMRs) and wants to use so-called MOX technology to make it possible to recycle spent uranium from conventional nuclear power plants.
7
Country: USA | Funding: $629M
Kairos Power develops an advanced reactor technology that leverages TRI-Structural ISOtropic (TRISO) fuel in pebble form in combination with a low-pressure fluoride salt coolant.
Kairos Power develops an advanced reactor technology that leverages TRI-Structural ISOtropic (TRISO) fuel in pebble form in combination with a low-pressure fluoride salt coolant.
8
Country: USA | Funding: $469.6M
NuScale Power has developed a small modular reactor (SMR) to supply energy for electrical generation and other heat process applications.
NuScale Power has developed a small modular reactor (SMR) to supply energy for electrical generation and other heat process applications.
9
Country: USA | Funding: $440M
Oklo is building an always on, container-sized, truly carbon-free and emission-free nuclear generator.
Oklo is building an always on, container-sized, truly carbon-free and emission-free nuclear generator.
10
Country: Canada | Funding: $280M
Terrestrial Energy creates Integral Molten Salt Reactor plants that capture the full advantages of molten salt fission technology and the superiority of a molten salt as a reactor coolant.
Terrestrial Energy creates Integral Molten Salt Reactor plants that capture the full advantages of molten salt fission technology and the superiority of a molten salt as a reactor coolant.
11
Country: USA | Funding: $218.8M
Radiant develops portable nuclear microreactors for US military bases as clean energy alternatives.
Radiant develops portable nuclear microreactors for US military bases as clean energy alternatives.
12
Country: USA | Funding: $218.8M
Radiant develops portable nuclear microreactors as clean energy alternatives.
Radiant develops portable nuclear microreactors as clean energy alternatives.
13
Country: USA | Funding: $136M
Aalo makes small, factory-manufactured nuclear reactors that can fit in your garage, and power anything from a datacenter to a large city.
Aalo makes small, factory-manufactured nuclear reactors that can fit in your garage, and power anything from a datacenter to a large city.
14
Country: USA | Funding: $64M
Last Energy is creating a new system for the development and delivery of small modular nuclear power plants.
Last Energy is creating a new system for the development and delivery of small modular nuclear power plants.
15
Country: Denmark | Funding: $60M
Saltfoss develops the Compact Molten Salt Reactor - a smal modular reactor based on molten fluoride salt.
Saltfoss develops the Compact Molten Salt Reactor - a smal modular reactor based on molten fluoride salt.
16
Country: USA | Funding: $51M
The Nuclear Company is a fleet-scale nuclear development company using proven technology to construct a series of nuclear power plants across America.
The Nuclear Company is a fleet-scale nuclear development company using proven technology to construct a series of nuclear power plants across America.
17
Country: Netherlands | Funding: €42.5M
Thorizon aims to develop a new generation of nuclear power plants - molten salt reactors.
Thorizon aims to develop a new generation of nuclear power plants - molten salt reactors.
18
Country: USA | Funding: $45M
Blue Energy is a nuclear power plant company that provides reliable, clean, and abundant electricity.
Blue Energy is a nuclear power plant company that provides reliable, clean, and abundant electricity.
19
Country: Switzerland | Funding: $43.5M
Transmutex develops technology designed to reduce the stockpile of nuclear waste-based energy.
Transmutex develops technology designed to reduce the stockpile of nuclear waste-based energy.
20
Country: Denmark | Funding: $33.6M
Copenhagen Atomics is a manufacturer of thorium reactors.
Copenhagen Atomics is a manufacturer of thorium reactors.
