Xe-100
Pebble-bed high-temperature gas-cooled small modular reactor, about 80 MWe per reactor, offered as a four-reactor plant.
Development
Startup · United States
X-energy
HQ RockvilleFounded 2009NASDAQ:XE
Developer of the Xe-100 pebble-bed high-temperature gas-cooled SMR, the XENITH microreactor (originally developed for DoD Project Pele, now under DIU's ANPI program) and TRISO-X fuel; listed on Nasdaq in April 2026.
Programs1 program
Programs1
| Program | Role | Program status | Confidence |
|---|---|---|---|
| Advanced Nuclear Power for Installations | Prime | Development | Confirmed |
Systems2
XENITH
X-energy's high-temperature gas-cooled microreactor, first developed for DoD's Project Pele and continued under DIU's Advanced Nuclear Power for Installations program.
Development
Newest unveiled first. Open a system for its milestone timeline, components and sources.
Capabilities3
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Advanced reactor fuel fabrication | Developer | Development | — | TRISO-X fuel fabrication facility under construction. | Confirmed |
| Microreactors | Developer | Development | — | XENITH, first developed for DoD Project Pele; ANPI agreement with DIU and the Department of the Air Force (2025). | Confirmed |
| Small modular reactors | Developer | Development | — | Xe-100 (about 80 MWe per reactor; four-pack plant ~320 MWe). | Confirmed |
- DeveloperTRISO-X fuel fabrication facility under construction.DevelopmentConfirmed
- DeveloperXENITH, first developed for DoD Project Pele; ANPI agreement with DIU and the Department of the Air Force (2025).DevelopmentConfirmed
- DeveloperXe-100 (about 80 MWe per reactor; four-pack plant ~320 MWe).DevelopmentConfirmed
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
Sources4
Profile2
- 1
X-energy · Apr 23, 2026 · Supports Organization · ticker, Organization · website
“The shares are expected to begin trading on the Nasdaq Global Select Market (“Nasdaq”) on April 24, 2026, under the ticker symbol “XE.””
- 2OtherX-energy - Wikipedia
Wikipedia · Supports Organization · founded year
“The company was founded in 2009 by Kam Ghaffarian”
Systems2
- 3CompanyX-energy, U.S. Department of Defense to Advance Commercial Microreactor for National Security
X-energy · Aug 14, 2025 · Supports Organization, Organization technology, System
“The agreement supports continued design and development for the X-energy XENITH microreactor under the Advanced Nuclear Power for Installations (“ANPI”) program, an initiative led by DIU in partnership with the Department of the Air Force.”
- 4Government recordX-energy LLC – XE-100
U.S. Nuclear Regulatory Commission · Supports Organization · hq city, Organization technology, System
“X-energy is a Rockville, MD company designing the Xe-100 reactor which is a pebble-bed, high-temperature gas-cooled reactor (HTGR). Each reactor will generate 200MWt and approximately 80MWe.”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.