X-energy's Xe-100
Where it stands: X-energy has ordered its first Xe-100 steam-generator tubing, with Alleima making the alloy and Doosan Enerbility forming helical coils for a proposed four-unit Dow plant in Texas under the Department of Energy's Advanced Reactor Demonstration Program. Fluor will handle nuclear-island engineering for Energy Northwest's four-unit Cascade project in Washington, the first in X-energy and Amazon's plan to deploy 5 GW of new nuclear by 2039. Watch first coil deliveries, Dow licensing and construction, and Cascade's permit application.
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- 2026-11-05X-energy announced its first steam generator tubing procurement for the Xe-100 small modular reactor — Alleima to manufacture the high-temperature alloy tubing, Doosan Enerbility to form it into helical coils for steam up to 565°C — for the first Xe-100 deployment, a proposed four-unit plant with Dow in Texas under the Department of Energy's Advanced Reactor Demonstration Program, following a December 2025 agreement reserving Doosan capacity for 16 Xe-100 vessel sets (EnergyNews). Watch: first coil-set deliveries, Dow Texas licensing and construction progress, the Xe-100 UK design review and further long-lead orders.
AI image - 2026-11-05(second source): Alleima confirmed the tubing order on its side — the company's first order for steam generator tubing for a next-generation helium-cooled small modular reactor, procured by Doosan Enerbility for X-energy's first Xe-100 deployment, a proposed four-unit plant in Texas under the Department of Energy's Advanced Reactor Demonstration Program — with the tubing to be produced at Alleima's Tube Mill 2026 facility in Sandviken, Sweden, opened in June 2026 to serve both conventional nuclear plants and SMRs (Indian Chemical News).
AI image - 2026-11-05 X-energy says the Nuclear Regulatory Commission has completed its safety review of the Xe-100 high-temperature gas-cooled design, clearing a step toward the construction permit for its proposed Dow Seadrift plant in Texas — a company-reported claim so far, with no regulator notice or independent confirmation linked (Simply Wall St. via Yahoo Finance). Watch: the NRC's final decision on the Xe-100 construction permit and any independent confirmation of the safety review's completion.
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November 2026 · 1 update
- 2026-11-05 Fluor was selected by X-energy to provide nuclear-island engineering, design development, supply chain, estimating and project-controls services for Energy Northwest's Cascade Advanced Energy Facility near Richland, Washington — four Xe-100 reactors generating about 320 MW, expandable to 12 units and 960 MW, and the first project in X-energy and Amazon's plan to deploy 5 GW of new nuclear by 2039. It is X-energy's second commercial nuclear-island engineering and design contract with Fluor after the Dow Seadrift project in Texas, with Cascade Nuclear Partners (Kiewit Nuclear Solutions, Black & Veatch, Aecon) as Energy Northwest's progressive design-builder for the conventional island; X-energy cites a commercial pipeline of 11.5 GW (Fluor via Business Wire · Securities.io). Watch: the Cascade construction-permit application, further engineering and long-lead scopes, and second-of-a-kind cost-and-schedule gains versus Seadrift.