# X-energy Xe-100 reactor deployment in the US

> Developing situation record from CLSTR: https://clstr.news/situations/x-energy-xe-100-reactor-deployment-in-the-us
> Updated: 2026-11-09T18:39:41.000Z. Sources: 8. Developments: 2.

X-energy has reached significant regulatory milestones for its Xe-100 high-temperature gas-cooled reactor technology. Following a completed safety review by the US Nuclear Regulatory Commission (NRC), the agency issued a construction permit for the Long Mott Generating Station in Calhoun County, Texas. This facility, intended to serve Dow Chemical Company’s Seadrift Operations, will utilize four Xe-100 reactors to provide electricity and process steam, marking the first approval for this reactor type in nearly 60 years.

Additionally, the Cascade Advanced Energy project is in the pre-application stage with the NRC. This project aims to install four Xe-100 reactors near Richland, Washington, on the Department of Energy’s Hanford Reservation. The Washington initiative involves Energy Northwest, includes strategic funding from Amazon, and is estimated to cost over $2 billion.

## Timeline

### 2026-11-09: X-energy technology advances with new US nuclear reactor permits

The US NRC has approved a new high-temperature gas-cooled reactor facility in Texas, while a similar X-energy modular reactor project advances in Washington.

6 sources. https://clstr.news/cluster/x-energy-technology-advances-with-new-us-nuclear-reactor-permits

### 2026-11-02: X-energy Xe-100 reactor completes US safety review

X-energy’s Xe-100 reactor has passed a key US Nuclear Regulatory Commission safety review, advancing plans for a first-of-its-kind industrial nuclear plant in Texas.

3 sources. https://clstr.news/cluster/x-energy-xe-100-reactor-completes-us-safety-review

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Cite as: X-energy Xe-100 reactor deployment in the US. CLSTR, https://clstr.news/situations/x-energy-xe-100-reactor-deployment-in-the-us