# X-energy

**Source:** https://geo.sig.ai/brands/x-energy  
**Vertical:** Climate Tech  
**Subcategory:** Small Modular Reactors (SMR)  
**Tier:** Challenger  
**Website:** x-energy.com  
**Last Updated:** 2026-04-14

## Summary

Raised $700M Series D (Nov 2025). Fluor signed project management contract for Seadrift Texas facility (Apr 2026). Closest SMR to US construction groundbreaking.

## Company Overview

X-energy is a nuclear energy company developing the Xe-100 pebble-bed high-temperature gas-cooled small modular reactor (SMR), the closest advanced reactor to actual construction groundbreaking in the United States. The company raised $700 million in Series D financing in November 2025 and in April 2026 signed a project management contract with Fluor — one of the world's largest engineering and construction firms — for the Seadrift, Texas facility that will be North America's first grid-scale advanced reactor serving an industrial customer (Dow).

The pebble-bed design is inherently walk-away safe: TRISO fuel pebbles are coated in layers of carbon and ceramic that retain fission products even in loss-of-coolant accidents without requiring emergency cooling systems. This passive safety design enables siting closer to industrial facilities than traditional light-water reactors, making X-energy's partnership with Dow for industrial heat and power particularly compelling.

X-energy has executed multiple supply chain contracts in 2026 — including a $100 million+ graphite supply deal with SGL Carbon and a gigawatt-scale deployment letter of intent with Talen Energy — indicating the company is moving from permitting into active build preparation. Fluor's involvement brings tier-1 construction execution capacity, the critical bottleneck for nuclear plant delivery timelines.

## Frequently Asked Questions

### What does X-energy make?
The Xe-100 pebble-bed small modular reactor (SMR) — high-temperature gas-cooled, passively safe design, targeting industrial heat and power for customers like Dow.

### How much has X-energy raised?
$700M Series D in November 2025. Fluor signed a construction management contract for the Seadrift Texas facility in April 2026.

### What makes Xe-100 passively safe?
TRISO fuel pebbles are coated in carbon and ceramic layers that retain fission products without emergency cooling systems — walk-away safe by design.

### Who is X-energy's first industrial customer?
Dow — the Seadrift Texas facility will be North America's first grid-scale advanced reactor serving an industrial customer for heat and power.

### What type of SMR does X-energy develop?
X-energy develops the Xe-100 — a pebble bed high-temperature gas-cooled reactor (HTGR). It uses TRISO fuel pebbles (uranium particles coated in multiple protective layers) and helium coolant, operating at higher temperatures than conventional light water reactors — enabling both electricity generation and industrial process heat.

### What is TRISO fuel and why is it safer?
TRISO (tristructural isotropic) fuel consists of uranium kernels coated in multiple ceramic and carbon layers that contain radioactive fission products under any conceivable accident scenario — without external cooling systems. This makes TRISO-fueled reactors inherently safe and eliminates the meltdown risk of conventional nuclear fuel.

### Who are X-energy's partners and customers?
X-energy has a major partnership with Dow Chemical to deploy the Xe-100 to provide process heat and power for a US Gulf Coast industrial facility — one of the first SMR agreements with an industrial customer. Amazon has also invested in X-energy to power data centers with clean baseload nuclear electricity.

### What DOE support has X-energy received?
X-energy was selected for the DOE's Advanced Reactor Demonstration Program (ARDP) with a $1.2 billion cost-share award — one of the two flagship advanced reactor demonstrations funded by DOE to reach commercial operation in the late 2020s.

## Tags

energy, b2b

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*