SMR companies, licence by licence

Five companies in this table have construction approval outside China and Russia. TVA has an NRC construction permit for a GE Vernova Hitachi BWRX-300 at Clinch River (29 September 2026), and OPG has been building one at Darlington since its April 2025 CNSC licence. TerraPower’s Natrium has an NRC permit decision dated 9 March 2026, Dow’s Long Mott project won its NRC permit for four X-energy Xe-100s on 9 November 2026, and Kairos Power (Hermes 2) and Natura Resources (MSR-1) hold NRC permits for demonstration reactors. China’s HTR-PM has run commercially since December 2023.

Sources: GE Vernova Hitachi, TerraPower, X-energy, Kairos Power, Natura, HTR-PM

Google signed for 500 MW from Kairos Power by 2035, and TVA buys up to 50 MW from Kairos’s Hermes 2 for the grid that serves Google’s data centers. Amazon and X-energy plan more than 5 GW of Xe-100 projects by 2039. Meta signed with Oklo for a 1.2 GW campus in Ohio and with TerraPower for up to eight Natrium plants (both January 2026). Switch holds a 12 GW master agreement with Oklo, and Equinix has deals with Oklo, Radiant, Stellaria and Rolls-Royce SMR’s Dutch developer.

Sources: Kairos, X-energy, Oklo, TerraPower, Radiant, Stellaria

In this table, modules run from about 1 MWe (Radiant Kaleidos, Terra Innovatum SOLO) to 470 MWe (Rolls-Royce SMR). The common grid-scale sizes are 75 to 80 MWe (Oklo, Kairos, NuScale, X-energy), 300 MWe (BWRX-300, Moltex SSR-W), 345 MWe (TerraPower’s Natrium) and 375 MWe (Westinghouse AP300). Microreactors, 20 MWe or less, power a single site: a base, a mine, a campus or a data hall.

Sources: Radiant, Rolls-Royce SMR, NuScale, X-energy, TerraPower, Westinghouse, Terra Innovatum, Oklo, Kairos, BWRX-300, Moltex

9 companies in the table have listed shares: NuScale Power (NYSE: SMR), NANO Nuclear Energy (NASDAQ: NNE), BWX Technologies (NYSE: BWXT), Deep Fission (NASDAQ: FISN), X-energy (NASDAQ: XE), Terra Innovatum (NASDAQ: NKLR), Hadron Energy (NASDAQ: HDRN), Oklo (NYSE: OKLO), Terrestrial Energy (NASDAQ: IMSR). Holtec postponed its proposed IPO on 17 September 2026; its offering did not price. GE Vernova Hitachi, Westinghouse and Rolls-Royce SMR sit inside larger groups.

Sources: NuScale Power, NANO Nuclear Energy, BWX Technologies, Deep Fission, X-energy, Terra Innovatum, Hadron Energy, Oklo, Terrestrial Energy, Holtec

A US Department of Energy programme that authorizes test reactors outside NRC licensing, with a goal of three reaching criticality by 4 July 2026. Antares (Mark-0, 4 June 2026), Valar Atomics (Ward 250, June 2026) and Aalo Atomics (Aalo-X, 4 July 2026) went critical in it. Radiant’s Kaleidos is in DOE’s DOME test bed at Idaho National Laboratory with approval for full-power operation, and Last Energy is building a pilot and Deep Fission targets its DOE pilot for 2027.

Sources: Antares, Valar, Aalo, Radiant, Deep Fission

Yes. The full table is free to reuse under CC BY 4.0 with a link to smrcompanies.com, as CSV or JSON. Every record carries its source URLs and verified date.