# SMR Companies > Compare 41 SMR and advanced-reactor design companies by output, licensing stage and first-operation target. 12 have announced data-center agreements. GE Vernova Hitachi, TerraPower, X-energy, Kairos and Natura have construction approvals for specific projects. Every figure links to its dated source. Every SMR company by design, MWe, licence and data-center deal, each fact sourced and dated. 41 companies, each field linked to its public source, last verified 2026-11-11. When citing, link the canonical HTML page. ## Data - [SMR companies, licence by licence](https://smrcompanies.com/): the full comparison table - [Data (JSON)](https://smrcompanies.com/data.json): every record with sources - [Data (CSV)](https://smrcompanies.com/data.csv): one row per company - [Methodology](https://smrcompanies.com/methodology/): what each field means and how it is verified ## Companies - [Aalo Atomics](https://smrcompanies.com/aalo-atomics/): Builds the Aalo-1, a 10 MWe sodium-cooled reactor, and the Aalo Pod, five of them in a 50 MWe plant aimed at data centers. Its test reactor went critical at Idaho National Laboratory on 4 July 2026. - [Antares Nuclear](https://smrcompanies.com/antares/): Builds sodium heat-pipe microreactors for military bases, space and remote grids. Its Mark-0 was the first reactor to go critical under the DOE Reactor Pilot Program. - [ARC Clean Technology](https://smrcompanies.com/arc-clean-technology/): Designs the ARC-100, a 100 MWe sodium-cooled fast reactor. NB Power plans the first unit at the Point Lepreau site in New Brunswick. - [Blue Capsule](https://smrcompanies.com/blue-capsule/): Develops a sodium-cooled high-temperature reactor for industrial heat, steam and electricity. CEA describes 150 MWt of heat or 50 MWe of electricity; ASNR lists the industrial prototype in preparatory review. - [Blykalla](https://smrcompanies.com/blykalla/): Swedish developer of SEALER-55, a 55 MWe lead-cooled reactor, with reactor parks of six to eight units under application in Sweden. - [BWX Technologies](https://smrcompanies.com/bwxt/): Naval reactor and nuclear fuel manufacturer building Project Pele, a 1.5 MWe transportable gas-cooled microreactor for the US Department of Defense, and the civil BANR microreactor. - [Calogena](https://smrcompanies.com/calogena/): French start-up designing the CAL30, a 30 MW thermal water-cooled reactor that supplies city district-heating networks with heat only. - [China Huaneng (HTR-PM)](https://smrcompanies.com/china-huaneng/): State utility that leads and operates the HTR-PM at Shidaowan, the first commercial high-temperature gas-cooled modular plant: two pebble-bed reactors driving one 210 MWe turbine. - [CNNC (China National Nuclear Corporation)](https://smrcompanies.com/cnnc/): China’s state nuclear group behind the ACP100 Linglong One at Changjiang, Hainan. The integral PWR is under commissioning; IAEA PRIS reports 100 MWe net and 125 MWe gross, with no first-grid-connection date. - [Copenhagen Atomics](https://smrcompanies.com/copenhagen-atomics/): Danish developer of a containerised thorium molten salt reactor, 100 MWt and 42 MWe per unit, sold for $50 million upfront plus an annual fee. - [Deep Fission](https://smrcompanies.com/deep-fission/): Designs the Gravity reactor, a 15 MWe pressurized-water reactor placed about a mile down a borehole so the rock does the job of a containment building. It targets data centers. - [Fleet Nuclear (formerly ThorCon)](https://smrcompanies.com/fleet-nuclear/): Develops shipyard-built, liquid-fuelled molten salt power plants. The current F500 specification is a 500 MWe plant with four reactor cans; plant output is not entered as output per reactor. - [GE Vernova Hitachi Nuclear Energy](https://smrcompanies.com/ge-vernova-hitachi/): Designs the BWRX-300, a 300 MWe boiling-water SMR, and supplies it to utilities. The first unit is under construction at OPG’s Darlington site in Ontario, and TVA holds a US construction permit for Clinch River. - [General Atomics](https://smrcompanies.com/general-atomics/): Develops the helium-cooled Fast Modular Reactor for distributed electricity supply. Its current FMR page specifies 44 MWe per module, replacing the 50 MWe concept announced in 2020. - [Hadron Energy](https://smrcompanies.com/hadron-energy/): Listed developer of the Halo micro-modular reactor, designed to deliver 10 MWe from a truck-transportable vessel, core and containment. - [Hexana](https://smrcompanies.com/hexana/): CEA spin-off designing a plant of two 400 MWt sodium-cooled fast reactors coupled to thermal storage, for electricity and industrial heat. - [Holtec International](https://smrcompanies.com/holtec/): Nuclear equipment, decommissioning and plant-restart company developing the SMR-300 pressurized-water reactor. Its first two units, Pioneer 1 and 2, are planned at the Palisades site in Michigan. - [Jimmy Energy](https://smrcompanies.com/jimmy-energy/): French developer of a 20 MW thermal high-temperature gas reactor that delivers industrial process heat. Its first application covers a unit at Cristal Union’s Bazancourt sugar site. - [Kairos Power](https://smrcompanies.com/kairos-power/): Designs the KP-FHR, a fluoride-salt-cooled high-temperature reactor using TRISO pebble fuel, and builds its own demonstration plants in Oak Ridge, Tennessee. Google is its anchor customer. - [KHNP (i-SMR)](https://smrcompanies.com/khnp/): Korea Hydro & Nuclear Power leads the consortium with KAERI developing the i-SMR, a 170 MWe integral PWR planned as four-module, 680 MWe plants. - [Last Energy](https://smrcompanies.com/last-energy/): Builds the PWR-20, a 20 MWe factory-made pressurized-water microreactor, and sells power from it to data centers and industry. Its PWR-5 pilot is at Texas A&M’s RELLIS campus. - [Moltex Energy](https://smrcompanies.com/moltex-energy/): Canadian developer of the SSR-W, a 300 MWe molten salt reactor that burns fuel recycled from CANDU spent fuel with its WATSS process, planned at Point Lepreau. - [NANO Nuclear Energy](https://smrcompanies.com/nano-nuclear/): Listed microreactor developer whose KRONOS MMR is a 15 MWe high-temperature gas-cooled reactor. The first unit is planned on the University of Illinois Urbana-Champaign campus. - [Natura Resources](https://smrcompanies.com/natura-resources/): Texas developer of liquid-fuelled molten salt reactors. Its 1 MWt MSR-1 at Abilene Christian University holds an NRC construction permit issued in 2024; the MSR-100 is the 100 MWe commercial design. - [newcleo](https://smrcompanies.com/newcleo/): Develops lead-cooled fast reactors fuelled with MOX made from recycled plutonium, starting with the 30 MWe LFR-AS-30 and its MOX plant in France. - [NuScale Power](https://smrcompanies.com/nuscale-power/): Designs the NuScale Power Module, a factory-built light-water SMR, and sells plants of up to 12 modules to utilities and industrial buyers. Its US460 design holds an NRC standard design approval. - [Nuward (EDF)](https://smrcompanies.com/edf-nuward/): EDF subsidiary redesigning its Nuward SMR around proven PWR technology for European customers, with a first unit planned in France. - [Oklo](https://smrcompanies.com/oklo/): Listed developer of the Aurora powerhouse, a 75 MWe liquid-metal-cooled fast reactor sold as power, not hardware. It has announced data-center power deals with Meta, Switch and Equinix. - [Otrera New Energy](https://smrcompanies.com/otrera/): Develops sodium-cooled fast reactors for electricity and industrial heat. ASNR lists the OTRERA ONE industrial prototype at 200 MWt; older OTRERA 300 electric ratings are not assigned to this prototype. - [Radiant Industries](https://smrcompanies.com/radiant/): Builds Kaleidos, a transportable 1 MWe helium-cooled microreactor that fits in a shipping container, for data centers, military bases and remote sites. Equinix has pre-ordered 20 units. - [Rolls-Royce SMR](https://smrcompanies.com/rolls-royce-smr/): Rolls-Royce subsidiary designing a 470 MWe factory-built pressurized-water SMR. UK government picked it for three units at Wylfa, and ČEZ plans units in the Czech Republic. - [Rosatom](https://smrcompanies.com/rosatom/): Russia’s state nuclear corporation. It builds the RITM-200N, a 55 MWe land-based version of its icebreaker reactor, at Ust-Kuyga in Yakutia. - [Steady Energy](https://smrcompanies.com/steady-energy/): Finnish developer of the LDR-50, a 50 MW thermal light-water reactor that makes district heat rather than electricity. It has agreements for 15 reactors with Finnish municipalities. - [Stellaria](https://smrcompanies.com/stellaria/): French developer of the Stellarium, a molten salt fast-neutron breed-and-burn reactor, founded in 2023 by CEA and Schneider Electric. Equinix holds the first capacity reservation. - [Terra Innovatum](https://smrcompanies.com/terra-innovatum/): Listed developer of SOLO, a helium-cooled micro-modular reactor rated at 1 MWe, aimed at industrial sites, mines and data centers. - [TerraPower](https://smrcompanies.com/terrapower/): Designs Natrium, a 345 MWe sodium-cooled fast reactor with molten-salt storage that can boost output to 500 MWe. Its first plant is under construction at Kemmerer, Wyoming. - [Terrestrial Energy](https://smrcompanies.com/terrestrial-energy/): Listed developer of the Integral Molten Salt Reactor. Its IMSR400 plant pairs two 195 MWe reactors and targets grid power, industrial heat and data centers. - [Thorizon](https://smrcompanies.com/thorizon/): Dutch-French developer of Thorizon One, a 100 MWe molten salt reactor built from replaceable cartridges, planned for Zeeland in the Netherlands. - [Valar Atomics](https://smrcompanies.com/valar-atomics/): Builds the Ward 250, a helium-cooled TRISO-fuelled gas reactor designed for mass production. It was the second reactor to go critical under the DOE Reactor Pilot Program. - [Westinghouse Electric Company](https://smrcompanies.com/westinghouse/): Reactor vendor behind the AP1000. It markets the AP300, a 375 MWe single-loop PWR built from AP1000 technology, and eVinci, a heat-pipe microreactor. - [X-energy](https://smrcompanies.com/x-energy/): Designs the Xe-100, an 80 MWe pebble-bed high-temperature gas reactor, and makes its own TRISO-X fuel. Dow’s Long Mott project in Texas and Amazon’s Cascade project in Washington are its first plants. ## Optional - [All records in one file](https://smrcompanies.com/llms-full.txt) - [Sitemap](https://smrcompanies.com/sitemap.xml)