Permit for Four Reactors in Texas Opens First U.S. Advanced Industrial Nuclear Site

Key Facts

On November 9, 2026, the U.S. Nuclear Regulatory Commission approved an application for a construction permit for 4 Xe-100 reactors at Dow’s operations site in Seadrift, Texas, paving the way for a nuclear project at a U.S. industrial site. X-energy and Dow said the approval concerns the application by Long Mott Energy, a wholly owned Dow subsidiary that filed the application and holds the permit. X-energy described the decision as the NRC’s first approval for a high-temperature gas-cooled reactor in about 60 years, and the first approval of its kind for an industrial nuclear site in the United States. The project aims to supply Dow’s facility with the electricity and high-temperature steam needed for its industrial operations. The approval places the project in the regulatory construction phase, but does not authorize the reactors to operate or generate electricity.

Each reactor has an electrical capacity of 80 megawatts and a thermal capacity of 200 megawatts, according to X-energy specifications. The U.S. Department of Energy describes the project as a 4-unit plant with a net electrical capacity of 320 megawatts, consistent with the stated electrical capacity of the units. The design combines electricity generation with high-temperature heat for Dow’s plant, directly linking the project to the industrial facility’s needs. The NRC says each reactor uses helium to cool its core, and that the heat will support industrial processes at Dow’s plant. The project is intended to meet industrial heat needs that are difficult to decarbonize, according to the Department of Energy’s description.

The permit follows a regulatory review that began with an application filed by Long Mott Energy in March 2025. X-energy says the NRC docketed the application for review in May 2025 and set an 18-month schedule, while the company’s statement says the NRC established the schedule in June 2025 and completed its review slightly ahead of schedule. The environmental assessment concluded on May 18, 2026, with the NRC issuing a finding of “no significant impact” for the project as part of its review of the construction application. The NRC then announced in September 2026 that a mandatory hearing would be held in Port Lavaca, Texas, on September 22. The hearing included presentations on safety and environmental reviews and an opportunity to receive questions and comments from the public, before the approval was announced in November.

The construction permit authorizes construction to begin in accordance with the approved design, but does not constitute final approval to operate the facility. X-energy stressed that the permit “does not authorize operation,” meaning the project will need a separate operating license before fuel can be loaded and operations begin. In its 2025 notice, the NRC said each Xe-100 reactor would generate about 80 megawatts of electricity and that the Dow facility would need to apply separately for operating licenses in the future. The current approval therefore remains one step in the licensing process, while operations depend on completion of the subsequent regulatory procedure. This distinction between a construction permit and an operating license clearly defines what the current decision has achieved.

The Seadrift project differs from the collaboration between X-energy and Amazon, which also includes Energy Northwest and aims to add at least 5 gigawatts of new nuclear capacity in the United States by 2039. Cascade in Washington is the first project under the X-energy and Amazon initiative, according to the company. The permit announced in November applies to Dow’s facility in Texas and is unrelated to that target or to the Cascade partnership. The Department of Energy had included the Dow project in its Advanced Reactor Demonstration Program, which supports demonstrations of these reactors through cost-sharing partnerships with U.S. industry. This context gives the project an industrial dimension within a broader support program, without changing the scope of the permit for the Seadrift site.

A previous X-energy regulatory filing projected initial construction would begin in 2027, with the project targeting commercial operations in the early 2030s. The company tied that timing to obtaining the construction permit and other required approvals, while the start of major nuclear construction depends on design maturity and reaching a final investment decision. The announced timeline remains a projection made before the permit announcement, and the current approval alone does not mean operations are beginning. A separate operating license is a required milestone before fuel loading, while investment and design decisions will determine when the project moves from initial work to construction of the main nuclear facility. These stages set out a path for the project from the current permit through construction and then the licensing required for targeted commercial operations.