Technology · Nuclear energy and propulsion
Microreactors
Factory-built, transportable fission reactors of roughly 20 MWe or less for bases, remote sites and critical infrastructure.
PrototypePart of Advanced fission reactors
Inputs
0
0 high or critical
Maturity
Prototype
Field-wide rating
Sources
0
Behind these records
Who Builds It16
Fielded0
- —
Limited fielding0
- —
Prototype3
Development13
- Bluecore EnergyDeveloper
- BWXT Advanced TechnologiesDeveloper
- BWX TechnologiesDeveloper
- General Atomics Electromagnetic SystemsDeveloper
- Hadron EnergyDeveloper
- Last EnergyDeveloper
- NANO Nuclear EnergyDeveloper
- OkloDeveloper
- RadiantDeveloper
- Westinghouse Electric CompanyDeveloper
- Westinghouse Government ServicesDeveloper
- X-energyDeveloper
- Zap EnergyDeveloper
Research0
- —
Concept0
- —
- Aalo AtomicsDeveloper · USCritical Test Reactor (Aalo-X campus, INL) reached zero-power criticality on 2026-07-04.Prototype
- AntaresDeveloper · USMark-0 reached zero-power criticality at INL on 2026-06-04 (first under the DOE Reactor Pilot Program); Army Janus awardee (Fort Bragg).Prototype
- Valar AtomicsDeveloper · USWard 250 (100 kWt HTGR test reactor) reached zero-power criticality at the Utah San Rafael Energy Lab on 2026-06-18.Prototype
- Bluecore EnergyDeveloper · USDevelopment
- BWXT Advanced TechnologiesDeveloper · USBuilds the Project Pele prototype (core assembly ongoing in 2026) and BANR for Army Janus (Fort Campbell).Development
- BWX TechnologiesDeveloper · USThrough BWXT Advanced Technologies: Project Pele prototype and BANR (Army Janus, Fort Campbell).Development
- General Atomics Electromagnetic SystemsDeveloper · USGeneral Atomics Tactical Energy System (GA-TES); Army Janus awardee (Fort Hood).Development
- Hadron EnergyDeveloper · USDevelopment
- Last EnergyDeveloper · USPWR-5 pilot under construction at Texas A&M-RELLIS (DOE PDSA approved May 2026); not yet critical.Development
- NANO Nuclear EnergyDeveloper · USKRONOS MMR (3.5-15 MWe, NRC construction-permit pre-application) and ZEUS (first core hardware assembled for non-nuclear testing in 2025).Development
- OkloDeveloper · USAir Force Notice of Intent to Award (June 2025) for a licensed microreactor at Eielson AFB; Aurora-INL reactor under construction under DOE authorization.Development
- RadiantDeveloper · USKaleidos shipped to INL's DOME in August 2026 for a fueled test campaign; no criticality reported as of 2026-10-07. Army Janus awardee (Fort Benning).Development
- Westinghouse Electric CompanyDeveloper · USeVinci heat-pipe microreactor (5 MWe); selected for the Army Janus Program through Westinghouse Government Services (Fort Drum).Development
- Westinghouse Government ServicesDeveloper · USArmy Janus awardee (Fort Drum) for the Westinghouse eVinci microreactor.Development
- X-energyDeveloper · USXENITH, first developed for DoD Project Pele; ANPI agreement with DIU and the Department of the Air Force (2025).Development
- Zap EnergyDeveloper · USDevelopment
Placed by each organization's own maturity for this technology; TRL is self-reported or estimated, see confidence.
Systems15
| Aurora powerhouse | Oklo | Other | Development | — |
| BWXT Advanced Nuclear Reactor (BANR) | BWXT Advanced Technologies | Other | Development | — |
| eVinci microreactor | Westinghouse Government Services | Other | Development | — |
| General Atomics Tactical Energy System (GA-TES) | General Atomics Electromagnetic Systems | Other | Development | — |
| KRONOS MMR | NANO Nuclear Energy | Other | Development | — |
| XENITH | X-energy | Other | Development | — |
| ZEUS | NANO Nuclear Energy | Other | Development | — |
| Aalo-1 Reactor | Aalo Atomics | Other | — | — |
| Aalo Pod | Aalo Atomics | Other | — | — |
Showing 1–9 of 15 systems
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