X-energy
X-energy is an advanced nuclear reactor & fuel company. We develop Generation IV high-temperature gas cooled nuclear reactors (SMR) & TRISO fuel to power them.
71 in this dataset · 22 in this dataset
7 developers pursuing it
103 organisations in US
What these terms mean
Every classification on this page, defined. These are controlled-vocabulary terms, so the same word means the same thing on every profile.
- Reactor developer
- Develops a fission reactor design. Carries no implication that anything is licensed, funded or built.
- Supplier
- Supplies components, materials or fuel to the sector without developing a reactor or device of its own.
- Fission
- Advanced and small modular fission reactor developers, plus established reactor vendors.
- Fuel cycle
- Mining, conversion, enrichment, fabrication, reprocessing, waste and tritium supply.
- High-temperature gas-cooled reactor › › High-temperature gas-cooled reactor
- Helium-cooled and graphite-moderated, running far hotter than a water reactor. The high outlet temperature suits industrial process heat as well as electricity.
- TRISO particle fuel
- Fuel kernels wrapped in layers of carbon and silicon carbide, each particle its own containment vessel. Retains fission products to very high temperature.
- High-assay low-enriched uranium
- 5–20% U-235. The binding supply constraint for most advanced reactor designs.
- TRISO fuel
- Tri-structural isotropic fuel: fissile kernels in ceramic coatings that retain fission products at high temperature. The safety case for several advanced designs rests on it.
Funding
across 1 round
| Date | Instrument | Amount | Detail |
|---|---|---|---|
| 2025-02 | Equity roundSeries C | $700M | — |
In X-energy’s own words
Quoted from the organisation’s own site as we archived it. Their description of themselves, not ours, and not a claim this site has checked.
We design and deploy safe, efficient advanced small modular reactors for an unmatched range of global markets & applications.
X-energy is a leading developer of advanced nuclear energy technology. In an era of unprecedented electricity demand growth, our reactors and fuel provide the scalable and clean solutions necessary to meet that demand.
Our technology builds on decades of operational experience and research in both high-temperature gas reactors and TRISO fuel to deliver a new generation of nuclear energy tailored for the 21st century economy.
The modern economy demands more than just electricity. We are engineered to power the most energy-intensive sectors on Earth by delivering the high-temperature steam and constant power necessary for heavy industry and advanced technologies.
We unite a team of technical pioneers and infrastructure experts to bridge the gap between complex science and commercial execution. Our experienced team is transforming visionary energy technology into a secure, global reality.
Where X-energy sits
Composed from records in this dataset, not from outside research. Every figure below is counted from what the site holds, so it moves when the data does.
X-energy is one of 7 organisations in this dataset pursuing htgr.
It is one of 103 we hold in US.
Disclosed equity funding totals $700m across 1 round, which ranks 4 of 14 among organisations here with a disclosed figure.
1 regulatory milestone is tracked against a regulator's own record.
Related organisations
Others pursuing the same approach, then others in the same country.
People
Names and roles as X-energy’s own team page states them. Not verified against any other source, and rosters go out of date.
Regulatory position
Stage as recorded against the regulator’s own docket where one is held. An entry marked no anchor has no reference a reader could look up.
| Stage | Date | Regulator | Anchor |
|---|---|---|---|
| Application submittedConstruction permit application submitted for Long Mott (Dow Seadrift) | 2025-03 | US Nuclear Regulatory Commission | no anchor |
Pursuing the same technology
Others in this dataset working on High-temperature gas-cooled reactor.
Sources
A source marked operator is the subject’s own publication. That is legitimate, and it is not independent confirmation. Methodology.