X-energy
X-energy is the nuclear steam supply system vendor for 16 reactor units on record, 0 of them operating, totalling 0.0 GW of gross capacity across 0 countries.
Developer of the Xe-100 high-temperature gas reactor and of the TRISO-X fuel facility in Oak Ridge, Tennessee, one of the few Western sources of TRISO fuel. The pairing matters: the Xe-100 needs HALEU, and X-energy is building its own supply of the fuel form rather than relying on the market.
| Headquarters | Rockville, Maryland, USA |
|---|---|
| Founded | 2009 |
| Ownership | private |
| Roles in the chain | vendor, fabricator |
Position in the chain
Downstream
Output from this company feeds the stages below it in the chain, and ultimately 419 operating reactors across these types.
| Reactor type | Operating units |
|---|---|
| Pressurised water reactor | 309 |
| Pressurised heavy water reactor | 46 |
| Boiling water reactor | 45 |
| Gas-cooled reactor | 9 |
| Light water graphite reactor | 7 |
| Fast reactor | 2 |
| High-temperature gas reactor | 1 |
Facilities
| Facility | Stage | Country | Capacity / output | Status |
|---|---|---|---|---|
| TRISO-X Fuel Facility (TX-1), Oak Ridge | triso | USA | not disclosed | construction |
X-energy in context
X-energy has 1 facility on record in 1 country (United States): 0 operating and 1 planned, licensing or under construction.
X-energy is the vendor of 1 reactor design line (Xe-100), covering 16 units on record, 0 of them operating.
It is behind 1 design in the SMR and advanced-reactor tracker: Xe-100.
Designs in the SMR and advanced-reactor tracker
| Design | MWe | Regulator | Position |
|---|---|---|---|
| Xe-100 | 80 | US NRC | Application docketed and under review |
How these are worked out: shares and ranks use the world totals cited in the table, and only named companies are ranked (unnamed or country-level entries in a source are not). A facility with no stated capacity is counted as a facility but adds nothing to a capacity figure. Vendor figures count operating units where this company is the recorded reactor vendor; ages count from the start-up year on record, and build times run from construction start to grid connection, as on the age and build-times pages.
What it supplies
| Product | For | Operating units of that kind |
|---|---|---|
| TRISO particle fuel, HALEU enrichment | htgr | - |
Recorded as capability against a reactor type or model line rather than against named units, because utilities do not publish fuel contracts.
Design lines
| Design | Generation | Capacity | Operating | Units |
|---|---|---|---|---|
| Xe-100 | IV | 80 MWe gross per module | - | 16 |
Installed base
| Unit | Country | Status | Model | Gross MW | Online |
|---|---|---|---|---|---|
| Cascade SMR nuclear power plant 1 | United States | Pre-construction | Xe-100 | 80 | 2032 |
| Cascade SMR nuclear power plant 10 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 11 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 12 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 2 | United States | Pre-construction | Xe-100 | 80 | 2032 |
| Cascade SMR nuclear power plant 3 | United States | Pre-construction | Xe-100 | 80 | 2032 |
| Cascade SMR nuclear power plant 4 | United States | Pre-construction | Xe-100 | 80 | 2032 |
| Cascade SMR nuclear power plant 5 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 6 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 7 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 8 | United States | Announced | Xe-100 | 80 | 2035 |
| Cascade SMR nuclear power plant 9 | United States | Announced | Xe-100 | 80 | 2035 |
| Long Mott nuclear power plant 1 | United States | Pre-construction | Xe-100 | 80 | 2033 |
| Long Mott nuclear power plant 2 | United States | Pre-construction | Xe-100 | 80 | 2033 |
| Long Mott nuclear power plant 3 | United States | Pre-construction | Xe-100 | 80 | 2033 |
| Long Mott nuclear power plant 4 | United States | Pre-construction | Xe-100 | 80 | 2033 |
Sources
- X-energy, company source
- Global Nuclear Power Tracker, Global Energy Monitor, August 2026 release , CC BY 4.0 · retrieved 2026-09-06
How these sources are used, including the corrections applied on top of them and what is deliberately left blank · download the underlying data