X Energy, LLC
Rockville, MD Part of X-Energy Reactor Company, LLC
- UEI
- G9VTBQMKSTQ8
- CAGE
- 6X4A1
- Primary NAICS
- 332410 Power Boiler and Heat Exchanger Manufacturing
- SAM.gov registration
- Active through
Company facts
- FY2025 rankings
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Corporate family
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Parent
Rockville, MD
C9Y9LWG4F4T4
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- Rockville, MD KAVKVLMJ6K64
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Parent
Rockville, MD
C9Y9LWG4F4T4
- SAM.gov registration date
- Physical address
- 530 Gaither Rd Suite 700, Rockville, MD 20850, USA
- Website
- x-energy.com
- Founded
- 2009
- Employees
- 251-1K
- Estimated annual revenue
- $50M-$100M
- Industry
-
- Utilities
- Electric Utilities
- Energy
- SIC code
- 49 Electric, Gas, & Sanitary Services
- Profiles
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $0 |
| FY2026 | $549,019 |
| FY2025 | $3,240,656 |
| FY2024 | $1,006,439 |
| FY2023 | $17,493,552 |
Top agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Office of the Secretary of Defense | $549,019 |
Contract awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Advanced nuclear power for installations (ANPI) | Office of the Secretary of Defense | $2,196,079 | |
| Design for a mobile nuclear reactor | Washington Headquarters Service | $63,057,848 |
Grant awards
Latest 5 listed here. See the rest on GovTribe.
Grant subawards
| Prime recipient | Prime award | Amount | Awarded |
|---|---|---|---|
| Physical Sciences Inc. | DESC0022664 | $26,715 |
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About the company
X Energy, LLC, an advanced nuclear reactor and fuel technology developer based in Rockville, Maryland, secures federal funding as a prime contractor and cooperative agreement recipient, with recent work centered on Department of Defense next-generation nuclear power applications and Department of Energy advanced reactor demonstrations. The company operates as a limited liability corporation under parent X-Energy Reactor Company, LLC, with a named subsidiary, Triso-X LLC, that specializes in TRISO fuel technology; X Energy competes in full-and-open federal procurements rather than under set-aside categories.
X Energy's core capability centers on Generation IV high-temperature gas-cooled reactor design, mobile and transportable microreactor development, and associated fuel systems for both military installations and civilian energy applications. Recent prime work includes a $3.95 million Other Transaction Agreement with the Office of the Secretary of Defense under the Advanced Nuclear Power for Installations (ANPI) program, awarded August 4, 2025, for advanced nuclear reactor and fuel development supporting military installation energy security; a $60.5 million OTA from DoD in 2020 for mobile nuclear reactor design and demonstration; and a cooperative agreement from the Department of Energy's Office of Nuclear Energy for market-driven optimization of the XENITH (Next-Generation Integrated Transportable High-Temperature) microreactor, completed June 30, 2025. X Energy also holds substantial Department of Energy funding, including a $1.46 billion cooperative agreement for advanced reactor demonstrations.
Customer concentration across the federal footprint is split between defense and civilian nuclear energy priorities. The Office of the Secretary of Defense accounts for two awards carrying $67 million in combined potential value, while the Department of Energy Office of Nuclear Energy, the Department of Energy Advanced Research Projects Agency, and the Department of Energy Office of Science collectively represent five awards. The two rankings converge — DoD dominates by dollar magnitude, while DOE-affiliated offices dominate by award count — reflecting X Energy's dual role as both a defense nuclear technology provider and a DOE advanced-reactor development partner. Two awards (combined potential value $4 million) reach ultimate completion within the next twenty-four months and face recompete exposure in that window.
X Energy acts as a prime on 89% of recent awards and as a subcontractor on one grant sub-award, where the company provided real-world application data and consulting support to Physical Sciences Inc. on additively manufactured heat exchanger components and materials qualification for high-temperature nuclear reactors. The company's federal footprint reflects nine awards across the past decade, with obligated dollars ($2.28 billion) substantially exceeding combined potential value, indicating heavy advancement of funds on large cooperative agreements that are in active performance phase.
Quick answers
Is X Energy, LLC registered in SAM.gov?
Yes. X Energy, LLC's SAM.gov registration is active through December 22, 2026.
What is X Energy, LLC's CAGE code?
X Energy, LLC's CAGE code is 6X4A1, and its Unique Entity ID (UEI) is G9VTBQMKSTQ8.
How much has X Energy, LLC received in federal contracts?
Federal contracts obligated $3,240,656 to X Energy, LLC in fiscal year 2025 and $22,289,666 in fiscal years 2023 through 2027.
How does X Energy, LLC rank among federal contractors?
X Energy, LLC ranked #9 in PSC AG in FY2025.
What is X Energy, LLC's most recent federal award?
X Energy, LLC's most recent federal contract award is Advanced nuclear power for installations (ANPI) (HQ08452590067), from Office of the Secretary of Defense, on August 4, 2025.
On GovTribe
See X Energy, LLC's full federal record
- Federal contract awards
- Federal grant awards
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
- Similar vendors