The global nuclear microreactors market was valued at USD 1.35 billion in 2025. It is estimated at USD 1.96 billion in 2026 and is projected to reach USD 9.83 billion by 2036, growing at a CAGR of 17.5% over the 2026-2036 forecast period. The report examines demonstration and deployment progress, reactor technologies, the nuclear fuel supply chain, the ecosystem and value chain, regulation and policy, cost and economics, investment and funding, competition, and the main opportunities for developers and suppliers through 2036.
Microreactors are very small fission reactors, typically producing up to about 20 MWe, that are built in factories, can be moved, and are installed where the power is used. As the smallest class of small modular reactors, they span TRISO-fueled gas-cooled, heat pipe, liquid metal, molten salt, and compact light water designs. Market value captures what developers, government programs, and customers spend on designing, demonstrating, and building reactors, on fuel, on engineering, licensing, and siting work, and on operation and upkeep, plus revenue from electricity once units are running under power purchase agreements. National laboratories, fuel enrichers and fabricators, component makers, developers, defense and civilian agencies, utilities, data center operators, and industrial users make up the ecosystem.
Executive Order 14301, signed in May 2025, moved the sector from studies to working hardware by setting the goal of at least three test reactors reaching criticality by 4 July 2026, and by that date Antares Nuclear, Valar Atomics, Deployable Energy, and Aalo Atomics had each taken a microreactor to zero-power criticality at Idaho National Laboratory (INL) under the Department of Energy (DOE) Reactor Pilot Program. In August 2026, the U.S. Army named five installations and vendors for its Janus Program, aiming to have at least one microreactor supplying usable electricity on an Army base by 30 September 2028. Fuel remains the main bottleneck: Centrus Energy had delivered 900 kilograms of high-assay low-enriched uranium (HALEU) to the DOE by June 2025, while the DOE estimates that more than 40 metric tons may be needed by 2030 to deploy advanced reactors.
HALEU is not yet sold commercially by domestic suppliers, and Centrus Energy's Piketon, Ohio, plant is the only U.S. facility licensed to enrich to the level these designs need, so fuel availability caps how many reactors can be built in the near term. Moving from DOE-authorized demonstration to NRC-licensed commercial service is another hurdle for civilian projects; the Eielson Air Force Base microreactor, for instance, targets commercial operation in 2030 subject to NRC licensing. Other challenges include reaching competitive costs without large production runs, where an INL global market study indicates that hundreds of units would need to be built by 2040, and thousands by 2050, to reach scale, as well as security, safeguards, and transport rules for dispersed sites, spent fuel handling, and community acceptance.
Defense programs offer the nearest large-scale opportunity, since the Army describes its five Janus selections as a first tranche, with more sites from the Army and other services to follow under five-year funding. Power for AI data centers, mines, chemical plants, and remote sites that now burn diesel is a large commercial opening, and factory production and fuel supply chains create room for manufacturers and fuel firms; Oklo, Terrestrial Energy, TRISO-X, and Valar Atomics were chosen by the DOE in September 2025 to pilot advanced fuel lines. Key trends include developers using DOE authorization to test reactors before seeking commercial licenses, the growing role of national laboratory test beds such as INL's DOME facility, and milestone-based, fixed-price government contracts modeled on NASA's Commercial Orbital Transportation Services program.
By reactor technology, the market covers high-temperature gas-cooled, heat pipe, liquid metal-cooled, molten salt, and light water reactors. High-temperature gas-cooled reactors are expected to hold the largest share in 2026, supported by well-funded TRISO-fueled programs such as the Department of Defense's Project Pele, which received its full TRISO core in late 2025, BWX Technologies' commercial designs, and the relative maturity of TRISO fuel. Liquid metal-cooled reactors are expected to grow at the highest CAGR, as sodium-cooled designs such as Aalo-X have already reached criticality and are aimed at data center power. Heat pipe designs remain prominent among transportable and test reactor concepts.
By power output, the study covers below 1 MWe, 1-5 MWe, 5-10 MWe, and 10-20 MWe units. The 1-5 MWe range is expected to account for the largest share in 2026, as many early transportable and military designs, including Project Pele, fall in this band and suit single-site loads at bases and remote locations. The 10-20 MWe range is expected to grow at the highest CAGR, since bases and data centers prefer bigger units, including Aalo's 10 MWe Aalo-X and the 20 MWe reactors planned for some Army sites, which spread fixed costs over more output. Units below 1 MWe serve mainly testing, research, and niche off-grid needs.
By deployment mode, the market is divided into stationary and transportable reactors. Stationary units are expected to hold the larger share in 2026, as military installation, data center, and industrial projects are built at fixed sites with long-term power agreements. Transportable units are expected to grow at the higher CAGR, supported by defense and remote applications that need power that can be relocated, a need Project Pele was designed to meet.
By fuel type, the report covers HALEU, in TRISO and other forms, and low-enriched uranium (LEU). HALEU is expected to account for the larger share in 2026, as most microreactor designs depend on it to achieve compact cores and long operation between refueling, and the DOE has allocated government HALEU to developers including Radiant, Westinghouse, and Antares Nuclear. LEU is expected to grow at the higher CAGR, as some developers choose it to avoid HALEU shortages and use existing fuel supply chains. Congress has also authorized funding to expand domestic LEU and HALEU production.
Offerings analyzed are reactor systems & modules, fuel & fuel services, engineering, licensing & siting services, operations & maintenance, and power & energy sales. Reactor systems & modules are expected to hold the largest share in 2026, as current spending centers on building demonstration reactors and first units, factories, and associated hardware. Power & energy sales are expected to grow at the highest CAGR, as contractor-owned and operated reactors, such as those planned under the Janus Program, begin supplying electricity under long-term contracts. Fuel services gain value as enrichment and TRISO fabrication capacity expands.
Applications include military installations, data centers, remote communities & off-grid, mining & industrial, research, testing & isotope production, and disaster relief. Military installations are expected to account for the largest share in 2026, because Janus, Pele, and the Oklo project at Eielson Air Force Base give developers committed government buyers. Data centers are expected to grow at the highest CAGR, supported by rising AI power needs, grid connection delays, and developers such as Aalo Atomics designing plants specifically for AI data centers. Remote communities and mines that depend on costly diesel also form a sizable future market.
By end user, the report covers defense, government & research, utilities & independent power producers, and commercial & industrial users. Defense is expected to represent the largest share in 2026, as military agencies are acting as anchor customers through installation energy programs and executive order mandates. Commercial & industrial users are expected to grow at the highest CAGR, as data center operators and industrial firms move to adopt microreactors once early units prove performance.
North America is expected to remain the biggest regional market in 2026 and to post the highest CAGR through 2036, as nearly all early activity is in the U.S., which hosts the four reactors that reached criticality under DOE authorization, the Janus selections, the Eielson and Pele defense projects, and the DOE's HALEU allocation and fuel line programs, as well as most profiled developers. Canada has strong potential among remote communities and mines that currently rely on diesel.
Europe and Asia-Pacific are likely to hold smaller but rising shares, as governments and industry look at microreactors for industrial heat, energy security, and remote sites, with national programs under way in the U.K., Japan, and South Korea. France, Poland, Romania, China, and Australia are also analyzed, and Rolls-Royce and Toshiba Energy Systems & Solutions bring established nuclear expertise from the U.K. and Japan. Uses in the Rest of the World center on remote mining and island grids.
The market is young and fragmented, with long-standing nuclear companies and defense contractors competing against venture-funded startups, each backing a different reactor design and relying on fuel suppliers and national laboratories for support. Rivalry turns on how far a company has progressed in demonstration, its access to fuel, ease of manufacture, licensing approach, fit between output and application, cost, and relationships with military and commercial buyers. Developers are pushing to reach criticality first, competing for government awards and HALEU allocations, setting up factories for serial output, locking in fuel and component supply, and courting data center and industrial clients. Recent milestones include the five Janus awards, Aalo's move into a one-million-square-foot factory and its fuel fabrication contracts with Global Nuclear Fuel, and Radiant's first HALEU delivery at INL in July 2026.
Key companies profiled in the report include Westinghouse Electric Company LLC (U.S.), BWX Technologies, Inc. (U.S.), General Atomics (U.S.), Radiant Industries, Inc. (U.S.), Antares Nuclear, Inc. (U.S.), Aalo Atomics, Inc. (U.S.), Valar Atomics, Inc. (U.S.), Deployable Energy (U.S.), Last Energy, Inc. (U.S.), NANO Nuclear Energy Inc. (U.S.), Oklo Inc. (U.S.), Standard Nuclear, Inc. (U.S.), Centrus Energy Corp. (U.S.), Rolls-Royce plc (U.K.), and Toshiba Energy Systems & Solutions Corporation (Japan).
Microreactors are very small fission reactors, typically producing up to about 20 MWe, that are built in factories, can be moved, and are installed where the power is used. As the smallest class of small modular reactors, they span TRISO-fueled gas-cooled, heat pipe, liquid metal, molten salt, and compact light water designs. Market value captures what developers, government programs, and customers spend on designing, demonstrating, and building reactors, on fuel, on engineering, licensing, and siting work, and on operation and upkeep, plus revenue from electricity once units are running under power purchase agreements. National laboratories, fuel enrichers and fabricators, component makers, developers, defense and civilian agencies, utilities, data center operators, and industrial users make up the ecosystem.
Executive Order 14301, signed in May 2025, moved the sector from studies to working hardware by setting the goal of at least three test reactors reaching criticality by 4 July 2026, and by that date Antares Nuclear, Valar Atomics, Deployable Energy, and Aalo Atomics had each taken a microreactor to zero-power criticality at Idaho National Laboratory (INL) under the Department of Energy (DOE) Reactor Pilot Program. In August 2026, the U.S. Army named five installations and vendors for its Janus Program, aiming to have at least one microreactor supplying usable electricity on an Army base by 30 September 2028. Fuel remains the main bottleneck: Centrus Energy had delivered 900 kilograms of high-assay low-enriched uranium (HALEU) to the DOE by June 2025, while the DOE estimates that more than 40 metric tons may be needed by 2030 to deploy advanced reactors.
Market Dynamics
Federal policy is the strongest driver: Executive Order 14299 told the Department of War to run a reactor at a domestic military base by 30 September 2028, and the DOE pilot program first chose 11 projects from 10 companies to proceed under DOE authorization rather than Nuclear Regulatory Commission (NRC) licensing, shortening timelines and signaling sustained demand. Military bases need power that keeps running when grids fail or fuel convoys are cut off, and loads are rising as bases add radar, drones, and energy weapons. Quick demonstration results, such as Aalo reaching criticality within a year of breaking ground, are lowering technical risk. Data centers and industrial users add demand for firm, carbon-free power on site, and Equinix has signed three agreements with advanced reactor developers that could supply up to 774 MW.HALEU is not yet sold commercially by domestic suppliers, and Centrus Energy's Piketon, Ohio, plant is the only U.S. facility licensed to enrich to the level these designs need, so fuel availability caps how many reactors can be built in the near term. Moving from DOE-authorized demonstration to NRC-licensed commercial service is another hurdle for civilian projects; the Eielson Air Force Base microreactor, for instance, targets commercial operation in 2030 subject to NRC licensing. Other challenges include reaching competitive costs without large production runs, where an INL global market study indicates that hundreds of units would need to be built by 2040, and thousands by 2050, to reach scale, as well as security, safeguards, and transport rules for dispersed sites, spent fuel handling, and community acceptance.
Defense programs offer the nearest large-scale opportunity, since the Army describes its five Janus selections as a first tranche, with more sites from the Army and other services to follow under five-year funding. Power for AI data centers, mines, chemical plants, and remote sites that now burn diesel is a large commercial opening, and factory production and fuel supply chains create room for manufacturers and fuel firms; Oklo, Terrestrial Energy, TRISO-X, and Valar Atomics were chosen by the DOE in September 2025 to pilot advanced fuel lines. Key trends include developers using DOE authorization to test reactors before seeking commercial licenses, the growing role of national laboratory test beds such as INL's DOME facility, and milestone-based, fixed-price government contracts modeled on NASA's Commercial Orbital Transportation Services program.
Segment Analysis
The report analyzes the market by reactor technology, power output, deployment mode, fuel type, offering, application, end user, and geography, helping stakeholders identify where early spending is concentrated and where growth will come from.By reactor technology, the market covers high-temperature gas-cooled, heat pipe, liquid metal-cooled, molten salt, and light water reactors. High-temperature gas-cooled reactors are expected to hold the largest share in 2026, supported by well-funded TRISO-fueled programs such as the Department of Defense's Project Pele, which received its full TRISO core in late 2025, BWX Technologies' commercial designs, and the relative maturity of TRISO fuel. Liquid metal-cooled reactors are expected to grow at the highest CAGR, as sodium-cooled designs such as Aalo-X have already reached criticality and are aimed at data center power. Heat pipe designs remain prominent among transportable and test reactor concepts.
By power output, the study covers below 1 MWe, 1-5 MWe, 5-10 MWe, and 10-20 MWe units. The 1-5 MWe range is expected to account for the largest share in 2026, as many early transportable and military designs, including Project Pele, fall in this band and suit single-site loads at bases and remote locations. The 10-20 MWe range is expected to grow at the highest CAGR, since bases and data centers prefer bigger units, including Aalo's 10 MWe Aalo-X and the 20 MWe reactors planned for some Army sites, which spread fixed costs over more output. Units below 1 MWe serve mainly testing, research, and niche off-grid needs.
By deployment mode, the market is divided into stationary and transportable reactors. Stationary units are expected to hold the larger share in 2026, as military installation, data center, and industrial projects are built at fixed sites with long-term power agreements. Transportable units are expected to grow at the higher CAGR, supported by defense and remote applications that need power that can be relocated, a need Project Pele was designed to meet.
By fuel type, the report covers HALEU, in TRISO and other forms, and low-enriched uranium (LEU). HALEU is expected to account for the larger share in 2026, as most microreactor designs depend on it to achieve compact cores and long operation between refueling, and the DOE has allocated government HALEU to developers including Radiant, Westinghouse, and Antares Nuclear. LEU is expected to grow at the higher CAGR, as some developers choose it to avoid HALEU shortages and use existing fuel supply chains. Congress has also authorized funding to expand domestic LEU and HALEU production.
Offerings analyzed are reactor systems & modules, fuel & fuel services, engineering, licensing & siting services, operations & maintenance, and power & energy sales. Reactor systems & modules are expected to hold the largest share in 2026, as current spending centers on building demonstration reactors and first units, factories, and associated hardware. Power & energy sales are expected to grow at the highest CAGR, as contractor-owned and operated reactors, such as those planned under the Janus Program, begin supplying electricity under long-term contracts. Fuel services gain value as enrichment and TRISO fabrication capacity expands.
Applications include military installations, data centers, remote communities & off-grid, mining & industrial, research, testing & isotope production, and disaster relief. Military installations are expected to account for the largest share in 2026, because Janus, Pele, and the Oklo project at Eielson Air Force Base give developers committed government buyers. Data centers are expected to grow at the highest CAGR, supported by rising AI power needs, grid connection delays, and developers such as Aalo Atomics designing plants specifically for AI data centers. Remote communities and mines that depend on costly diesel also form a sizable future market.
By end user, the report covers defense, government & research, utilities & independent power producers, and commercial & industrial users. Defense is expected to represent the largest share in 2026, as military agencies are acting as anchor customers through installation energy programs and executive order mandates. Commercial & industrial users are expected to grow at the highest CAGR, as data center operators and industrial firms move to adopt microreactors once early units prove performance.
Regional Analysis
The report covers North America, Europe, Asia-Pacific, and the Rest of the World, with analysis of 10 countries and two rest-of-region groups. The regional analysis considers reactor demonstration programs, defense procurement, fuel supply, regulatory pathways, and demand from remote, industrial, and data center users.North America is expected to remain the biggest regional market in 2026 and to post the highest CAGR through 2036, as nearly all early activity is in the U.S., which hosts the four reactors that reached criticality under DOE authorization, the Janus selections, the Eielson and Pele defense projects, and the DOE's HALEU allocation and fuel line programs, as well as most profiled developers. Canada has strong potential among remote communities and mines that currently rely on diesel.
Europe and Asia-Pacific are likely to hold smaller but rising shares, as governments and industry look at microreactors for industrial heat, energy security, and remote sites, with national programs under way in the U.K., Japan, and South Korea. France, Poland, Romania, China, and Australia are also analyzed, and Rolls-Royce and Toshiba Energy Systems & Solutions bring established nuclear expertise from the U.K. and Japan. Uses in the Rest of the World center on remote mining and island grids.
Competitive Landscape
The report reviews key growth strategies, competitive benchmarking, a competitive dashboard that classifies companies as industry leaders, market differentiators, vanguards, and emerging companies, and a 2025 market share/rank analysis. Company profiles cover business overview, financial performance, product portfolio, strategic developments, and SWOT analysis.The market is young and fragmented, with long-standing nuclear companies and defense contractors competing against venture-funded startups, each backing a different reactor design and relying on fuel suppliers and national laboratories for support. Rivalry turns on how far a company has progressed in demonstration, its access to fuel, ease of manufacture, licensing approach, fit between output and application, cost, and relationships with military and commercial buyers. Developers are pushing to reach criticality first, competing for government awards and HALEU allocations, setting up factories for serial output, locking in fuel and component supply, and courting data center and industrial clients. Recent milestones include the five Janus awards, Aalo's move into a one-million-square-foot factory and its fuel fabrication contracts with Global Nuclear Fuel, and Radiant's first HALEU delivery at INL in July 2026.
Key companies profiled in the report include Westinghouse Electric Company LLC (U.S.), BWX Technologies, Inc. (U.S.), General Atomics (U.S.), Radiant Industries, Inc. (U.S.), Antares Nuclear, Inc. (U.S.), Aalo Atomics, Inc. (U.S.), Valar Atomics, Inc. (U.S.), Deployable Energy (U.S.), Last Energy, Inc. (U.S.), NANO Nuclear Energy Inc. (U.S.), Oklo Inc. (U.S.), Standard Nuclear, Inc. (U.S.), Centrus Energy Corp. (U.S.), Rolls-Royce plc (U.K.), and Toshiba Energy Systems & Solutions Corporation (Japan).
How This Report Helps
- Provides reliable market size estimates and long-term forecasts for the global nuclear microreactors market through 2036.
- Explains how U.S. executive orders, the DOE Reactor Pilot Program, and defense programs are accelerating deployment.
- Assesses the impact of HALEU supply, NRC licensing, security and transport rules, and production costs on the market.
- Tracks demonstration and deployment status across DOE pilot projects, Janus, Project Pele, and planned commercial units.
- Identifies high-growth opportunities across reactor technology, power output, deployment mode, fuel type, offering, application, end user, and region.
- Benchmarks leading developers and fuel suppliers on technology, demonstration progress, contracts, fuel access, and manufacturing plans.
- Supports investment, partnership, procurement, and market entry decisions for developers, suppliers, defense agencies, data center operators, and investors.
Key Questions Answered
- How large is the global nuclear microreactors market today, and how fast will it grow through 2036?
- What are the main drivers, restraints, opportunities, challenges, and trends shaping the market?
- Which microreactors have reached criticality, and what are the next milestones for defense and commercial deployment?
- How will HALEU supply and fuel fabrication capacity affect the pace of deployment?
- How will developers move from DOE-authorized demonstration to NRC-licensed commercial operation?
- Which reactor technology, power output, deployment mode, fuel type, offering, application, and end user segments will grow the fastest?
- How large is the opportunity to supply data centers, mines, and remote communities?
- Which regions and countries offer the most attractive opportunities?
- Who are the leading companies in the market, and what contracts, fuel agreements, and factory investments are shaping competition?
Table of Contents
1. Introduction
2. Research Methodology
4. Market Overview
5. Nuclear Microreactors Market, by Reactor Technology
6. Nuclear Microreactors Market, by Power Output
7. Nuclear Microreactors Market, by Deployment Mode
8. Nuclear Microreactors Market, by Fuel Type
9. Nuclear Microreactors Market, by Offering
10. Nuclear Microreactors Market, by Application
11. Nuclear Microreactors Market, by End User
12. Nuclear Microreactors Market, by Geography
13. Competitive Landscape
14. Company Profiles
15. Appendix
LIST OF TABLES
LIST OF FIGURES
Companies Mentioned
- Westinghouse Electric Company LLC
- BWX Technologies, Inc.
- General Atomics
- Radiant Industries, Inc.
- Antares Nuclear, Inc.
- Aalo Atomics, Inc.
- Valar Atomics, Inc.
- Deployable Energy
- Last Energy, Inc.
- NANO Nuclear Energy Inc.
- Oklo Inc.
- Standard Nuclear, Inc.
- Centrus Energy Corp.
- Rolls-Royce plc
- Toshiba Energy Systems & Solutions Corporation
