Top 50 Small Nuclear Reactor

Develops micro modular reactors (MMRs) that generate 1-2 MW of electrical power and 5-22 MW of thermal power, using high-assay low-enriched uranium (HALEU) fuel and a ceramic core for improved safety and efficiency. These compact, transportable reactors can be deployed in remote locations, industrial sites, or space missions, providing scalable and reliable energy solutions with reduced costs and deployment times compared to traditional nuclear systems.

Rolls-Royce SMR designs factory-built small modular reactors (SMRs) that provide a scalable and cost-effective solution for generating clean nuclear energy. This technology addresses the urgent global demand for reliable, low-carbon power sources while minimizing construction risks and timelines.

This company develops lead-cooled small modular reactors (SMRs) for reliable and safe power generation. Their reactor design utilizes enriched uranium oxide fuel to achieve criticality, enabling deployment of nuclear power solutions.

Develops kilowatt-scale micro-fission reactors using HALEU TRISO fuel and sodium heat pipes to provide autonomous, passively safe, and highly reliable power for mission-critical facilities and space applications. These reactors operate continuously for over three years without a sustaining supply chain, minimizing maintenance and enabling deployment in remote or resource-limited environments.

NANO Nuclear Energy develops portable microreactors, specifically the "ZEUS" solid core battery reactor and "ODIN" low-pressure coolant reactor, to provide on-demand nuclear power solutions for remote locations and diverse applications. The company addresses the need for reliable, scalable energy sources in areas lacking access to traditional power infrastructure, while also focusing on nuclear fuel fabrication and transportation.

Radiant develops the Kaleidos, a portable nuclear microreactor that generates 1.2 MW of electricity and 1.9 MW of thermal power, providing a clean alternative to diesel generators in remote locations. This technology eliminates the need for on-site water use and nuclear waste, enabling rapid deployment and continuous power supply for critical infrastructure such as hospitals and military installations.

NuScale Power has developed a small modular reactor (SMR) designed for efficient electrical generation and thermal applications. This technology provides a scalable and reliable energy solution to meet the growing demand for low-carbon power sources.

Aalo Atomics manufactures factory-built, sodium-cooled micro-reactors designed for on-site deployment next to high-density compute facilities. These modular units provide scalable, carbon-free power without external water cooling, addressing the need for reliable energy near data centers.

Blue Capsule Technology develops a compact, underground sodium-cooled Small Modular Reactor (SMR) utilizing TRISO fuel to provide high-temperature industrial heat up to 750°C, steam, and electricity. This tri-vector energy source directly replaces fossil fuels for energy-intensive industries like cement and steel production. The subterranean design allows for safe, on-site, continuous, low-carbon energy supply without requiring water cooling.

Deep Atomic develops compact modular nuclear reactors specifically designed to provide onsite energy for high-density computing in AI data centers. This technology addresses the critical need for reliable and sustainable power sources, enabling efficient operations while minimizing environmental impact.

The startup manufactures microreactors that generate electricity from radioactive waste and thorium through molten salt reactions with plutonium and uranium. This technology provides a sustainable energy solution, enabling industries to utilize mining by-products while contributing to carbon neutrality goals.

Jimmy designs and operates thermal generators powered by nuclear micro-reactors to provide carbon-free industrial heat at a lower cost than fossil fuels. This technology enables industrial clients to utilize decarbonized heat for their processes without significant modifications to their existing systems.

The startup manufactures low-temperature nuclear reactors that generate carbon-neutral heat for district heating and industrial applications by operating at lower temperatures and pressures than traditional reactors. This design enhances safety and efficiency, enabling industries to transition to carbon neutrality while reducing reliance on fossil fuels.

Last Energy develops micro modular nuclear power plants using a factory-produced, fully modular design to provide reliable baseload power for industrial customers and utilities. Their delivery model minimizes upfront capital costs and land requirements, enabling efficient energy production while addressing the need for decarbonized energy solutions.

LIS Technologies develops patented laser isotope separation technology to efficiently enrich uranium for both Low-Enriched Uranium (LEU) used in existing nuclear reactors and High-Assay Low-Enriched Uranium (HALEU) for next-generation Small Modular Reactors (SMRs). This technology offers a scalable and cost-effective alternative to traditional enrichment methods, addressing the need for more efficient uranium processing in the nuclear energy sector.

Avalanche Energy develops compact micro-fusion reactors that provide carbon-neutral power for distributed energy and mobility applications. These reactors can be rapidly manufactured and deployed, delivering continuous energy for up to three years, addressing the need for sustainable power in remote locations.

Astral Systems builds compact lattice‑confinement fusion reactors that generate over 1 trillion D‑T fusions per second in a containerized chassis. The reactors provide on‑site production of medical isotopes for hospitals and a high‑flux, tunable neutron source for research labs, with automated safety interlocks and API‑driven data integration.

nT-Tao is developing a compact fusion reactor utilizing a Dynamic Stabilized Torus to generate 10-20 MW of electricity, providing a scalable and rapid deployment energy solution. This technology addresses the need for clean, reliable, and independent energy sources for various applications, including industrial facilities and remote locations.

Acceleron Fusion is developing muon-catalyzed fusion technology to create small, efficient power plants that operate at significantly lower temperatures than traditional fusion methods. This approach aims to provide a reliable source of clean energy, addressing the urgent need for sustainable solutions to combat climate change and enhance energy security.

Zap Energy is developing compact fusion power technology that eliminates the need for magnets or lasers, utilizing a novel approach to achieve nuclear fusion. This innovation aims to provide a cleaner and more efficient energy source, addressing the challenges of traditional fusion methods and their associated costs.

Thorizon develops molten salt reactors featuring patented cartridges that enhance safety and efficiency in nuclear energy production. This technology provides a responsible energy source, addressing the urgent need for sustainable and reliable power solutions.

Newcleo develops lead-cooled fast reactors and MOX fuel manufacturing to generate safe and sustainable nuclear energy while closing the fuel cycle. The company addresses the urgent need for low-carbon energy solutions to combat climate change and facilitate global decarbonization efforts.

CORE POWER is developing scalable nuclear technologies specifically designed for ocean transport and heavy industry applications. This approach addresses the need for reliable, low-emission energy sources to power large vessels and industrial operations, reducing dependence on fossil fuels.

Maritime Fusion develops high-temperature superconducting tokamaks to provide compact, high-power fusion reactors for defense and marine shipping vessels. This technology aims to enable breakeven fusion, offering a new energy source for applications requiring high power density.

HEXANA offers an integrated energy system combining modular sodium-cooled fast reactors with thermal energy storage. This provides heavy industries with a firm, low-carbon source of high-temperature heat and dispatchable power, enabling decarbonization of hard-to-abate sectors.

CURIO develops nuclear technologies focused on commercializing a closed fuel cycle through the production of proliferation-hardened plutonium-fueled reactors and molten salt reactors. By utilizing transuranic isotopes from spent nuclear fuel, CURIO aims to provide clean energy solutions that significantly reduce environmental impact while enhancing energy security and supporting advanced cancer therapies.

Zeno develops radioisotope power systems (RPSs) that convert heat from decaying isotopes into a reliable, carbon-free energy source for extended periods. These compact devices address the need for resilient power solutions in remote and challenging environments, including space and maritime applications.

Realta Fusion develops compact fusion systems utilizing magnetic mirror technology to produce zero-carbon industrial heat and power. The company addresses the need for sustainable energy solutions in hard-to-decarbonize sectors by offering scalable and cost-effective energy production.

Develops a commercial laser-based nuclear fusion reactor that generates power by compressing and igniting deuterium and tritium fuels using high-intensity lasers. This technology aims to provide a sustainable, carbon-neutral energy source, reducing dependence on fossil fuels and addressing global energy demands.

Pacific Fusion is developing a modular pulsed magnetic inertial fusion system that generates more fusion energy output than the energy input, utilizing a fast electric pulser and small fusion chambers. This technology aims to provide affordable, reliable fusion power to meet the growing global energy demand and combat climate change.

Novatron is developing the NOVATRON™ fusion reactor, which utilizes a stable magnetic configuration to confine super-hot plasma for efficient nuclear fusion. This technology aims to provide a reliable, clean energy source that eliminates carbon emissions and reduces dependence on fossil fuels and nuclear fission.

Commonwealth Fusion is developing smaller, cost-effective tokamak fusion systems using high-temperature superconducting magnets to produce net energy from fusion. The company aims to deliver clean, abundant energy through its SPARC machine, paving the way for the first commercial fusion power plant, ARC, to combat climate change.

Transmutex develops accelerator-powered technology that transforms existing nuclear waste into clean energy while producing radioisotopes for medical applications. This process reduces the volume and radiotoxicity of long-lived nuclear waste, enabling safe decay in under 500 years and addressing the challenges of nuclear waste management.

Kronos Fusion Energy designs and manufactures aneutronic modular fusion energy generators that provide clean, scalable industrial heat and electricity tailored to specific client needs. By utilizing advanced digital twin technology and a robust global supply chain, the company ensures efficient deployment and compliance with regulatory standards in the fusion energy sector.

Marvel Fusion develops fusion energy technology to provide a safe and environmentally friendly energy source. The company addresses the need for sustainable energy solutions by harnessing nuclear fusion, which produces minimal waste and eliminates greenhouse gas emissions.

OpenStar Technologies is developing levitated dipole reactors using High Temperature Superconductors to generate baseload fusion power for the electrical grid. This technology aims to eliminate reliance on fossil fuels by providing a reliable and sustainable energy source.

SHINE Technologies utilizes fusion technology to produce medical isotopes, recycle nuclear waste, and inspect industrial components, paving the way for the eventual generation of clean fusion energy. This approach addresses the need for safer industrial practices, improved healthcare solutions, and sustainable waste management.

NearStar Fusion is developing a modular Magnetized Target Impact Fusion (MTIF) technology that enables the rapid integration of clean fusion energy into existing power grids and microgrid infrastructures. This approach addresses the need for a reliable, tritium-free energy source that can retrofit traditional hydrocarbon power plants, delivering limitless and always-on energy to cities and industries worldwide.

Direct Kinetics Solutions (DKS) develops and manufactures Persistent Power Sources (PPS) that utilize beta-emitting isotopes to provide continuous, long-lasting power for applications such as CubeSats and IoT sensors. This technology addresses the limitations of traditional lithium-ion batteries by offering a lightweight, maintenance-free power solution that can operate reliably for decades in diverse environments.

Elementl Power develops and operates advanced nuclear power projects, acting as both a developer and independent power producer. The company aims to accelerate the deployment of safe and affordable next-generation nuclear energy.

This startup builds and operates small nuclear power plants on-site to provide firm, zero-carbon energy. They integrate nuclear technology and the supply chain to produce clean power, process heat, hydrogen, and other clean energy products.

The startup develops modular nuclear reactor technology to provide a reliable and sustainable energy supply while reducing reliance on oil shale for electricity generation. This technology enables organizations to access electricity at competitive rates, supporting both energy security and climate objectives.

Nuclearis Energy provides the N1 micro modular reactor, a factory-built 17 MW(e) pressurized water reactor designed for 15-30 years of operation without refueling. This compact, transportable unit offers high thermal efficiency and integrated spent fuel storage, delivering reliable, carbon-free electricity and process heat through an Energy-as-a-Service model.

Canadian Space Mining Corporation is developing micro nuclear reactors to provide sustainable energy solutions for remote locations on Earth and infrastructure in space. The company also focuses on utilizing space resources to mitigate Earth's shortages of water and critical minerals, while advancing healthcare technologies for remote populations.

Clean Core Thorium Energy develops ANEEL™ fuel, a specialized nuclear fuel designed for use in existing reactors. This technology enhances reactor efficiency and safety while addressing the limitations of traditional uranium-based fuels.

The startup develops molten salt reactor technology to provide a clean energy source while producing medical isotopes for critical healthcare applications. This technology addresses the need for sustainable energy solutions and reliable medical isotope supply in a world increasingly focused on environmental responsibility.

Saltfoss Energy develops modular, floating nuclear power plants utilizing Compact Molten Salt Reactor (CMSR) technology. These barges provide scalable, low-carbon electricity, desalinated water, and heat for industrial processes, offering a safe and cost-effective energy solution.

StarCube manufactures transportable, factory-built nuclear microreactors designed to fit within standard shipping containers. These inherently safe, self-regulating reactors provide continuous, carbon-free baseload power for critical infrastructure and remote sites independent of the electrical grid. The solution ensures 100% load fulfillment for off-grid operations requiring resilient energy supply.

Seaborg develops the Compact Molten Salt Reactor, a small modular reactor utilizing molten fluoride salt for efficient nuclear fission. This technology provides a safer and more sustainable energy source, addressing the need for low-carbon power generation.

Kärnfull Energi is the first nuclear electricity provider in the Nordic regions, focusing on funding research and development for next-generation nuclear technology, including small modular reactors (SMRs) and advanced fuel cycles. The company aims to deliver a reliable, low-carbon energy source to meet the increasing demand for sustainable electricity while enhancing energy security.