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The U.S. Nuclear Regulatory Commission has approved a construction permit for X-energy and Dow’s planned Long Mott high-temperature gas reactor project in Texas. The permit is a major regulatory step, not a final decision to build or permission to operate; Dow’s investment decision, fuel supply and an operating license remain outstanding.
The U.S. Nuclear Regulatory Commission has approved a construction permit for X-energy and Dow’s planned Long Mott nuclear project in Texas, clearing a key regulatory hurdle for a proposed high-temperature gas reactor plant. The approval does not mean construction is certain: Dow has not made a final investment decision, and the project will need a separate NRC authorization to operate.
Long Mott is planned as a nuclear cogeneration facility, designed to supply power and heat for industrial use. The NRC permit sets July 1, 2033 as the earliest date for completion of construction. That is a projected date in the permit, not confirmation that the plant will be built or begin operating then.
The approval marks the first NRC authorization to construct a high-temperature gas reactor (HTGR) in nearly 60 years, according to the source report. X-energy says it expects its Texas reactors to operate for 60 years. The project still faces further regulatory and commercial steps, including an operating license and a decision by Dow on whether to commit the multibillion-dollar investment.
Fuel is another dependency. X-energy says it has a federal commitment for the high-assay, low-enriched uranium (HALEU) needed for Long Mott, as well as a binding commercial agreement covering enough fuel for at least some of its broader planned reactor fleet. The fuel must be processed into pellets at X-energy’s planned Tennessee fabrication facility, which the company said in September was on track to open in early 2028.
A New Path for Industrial Nuclear Heat
The permit moves a proposed advanced reactor from planning toward a possible construction phase, while the project’s unresolved conditions show why a regulatory approval is not the same as a finished investment. If built, Long Mott would be intended to provide electricity and industrial heat, potentially serving energy needs at a major industrial site rather than only supplying electricity to the grid.
The development also tests whether newer reactor designs can advance through U.S. licensing and project development after earlier HTGRs operated and later closed. The near-60-year gap between NRC construction approvals makes this a notable regulatory milestone, but it does not establish that the technology will meet its proposed schedule, cost or performance targets. Those outcomes remain dependent on financing, fuel readiness, licensing and construction.
For readers, the distinction is practical: the NRC has approved a permit to build, but Dow’s final decision and a separate operating authorization still stand between the project and commercial operation. The permit’s 2033 completion date is an earliest stated construction-completion date, not a confirmed service date.
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Earlier U.S. Gas Reactor Experience
The United States has operated two earlier high-temperature gas reactors. A 40-megawatt reactor at Peach Bottom, Pennsylvania, produced electricity from 1966 to 1974. The Fort St. Vrain plant in Colorado operated from 1979 to 1989; the site is now a natural-gas-fired power plant owned by Xcel Energy.
The International Atomic Energy Agency attributed the earlier reactors’ early retirements to funding and technical problems. X-energy executive Robert Taylor described them as “a technology ahead of their time” in comments to Canary Media in May. He said HTGRs have since operated in multiple countries and improved, characterizing the change as “an Edsel-to-a-Ferrari comparison.” Those are Taylor’s assessments, not findings established by the NRC permit.
Long Mott is part of X-energy’s wider ambition to develop more than 11 gigawatts of reactors, according to the source report. The company’s plans depend in part on developing domestic HALEU fuel fabrication capacity, as well as securing customers and approvals for individual projects.
“As we move forward, we will continue to evaluate the project through the lens of competitiveness, execution readiness, and capital affordability before any decision regarding construction is made.”
— Edward Stones, Dow’s business vice president for energy and climate
Investment and Operating Approval Remain
Dow has not made a final investment decision on the multibillion-dollar project. X-energy said Dow is not expected to decide before 2028, although it may consider a preliminary investment decision next year. Stones’ statement did not commit Dow to construction.
The project also needs NRC permission to operate after it is built. The source report cites the NRC’s generic licensing schedule as indicating that this review could take about 18 months; the actual timing will depend on the application and review. The companies may submit that application while construction is underway, but the source material does not confirm a submission date.
Fuel readiness and the Tennessee fabrication facility’s schedule are further uncertainties. X-energy’s statements about federal fuel commitments and the facility’s expected opening are company claims; the material does not establish that the fuel has already been fabricated or delivered for Long Mott. It is also unclear whether the project will meet the permit’s earliest construction-completion date.
Decisions Before Construction Advances
The next major commercial milestone is Dow’s decision on whether to invest. X-energy has said Dow may consider a preliminary decision next year but does not expect a final decision before 2028. Until Dow commits, the construction permit alone does not establish that the multibillion-dollar project will proceed.
X-energy also needs to advance its Tennessee fuel fabrication facility, which it has said is expected to open in early 2028. The companies will need to pursue a separate NRC operating authorization before the reactors can run. The permit lists July 1, 2033, as the earliest construction-completion date; further project announcements and regulatory filings will clarify whether that schedule remains achievable.
Key Questions
What did the NRC approve?
The NRC approved a construction permit for the proposed Long Mott high-temperature gas reactor project in Texas. The permit is not authorization to operate the plant.
Does the permit mean construction will begin?
No. Dow has not made a final investment decision, and its business vice president said the company will continue evaluating the project before deciding about construction.
When could the facility be completed?
The permit identifies July 1, 2033 as the earliest date for completion of construction. That is a stated earliest date, not a confirmed operating date or guarantee of completion.
What approvals are still needed?
The project will need a separate NRC authorization to operate after construction. The companies also have to resolve commercial and fuel-supply requirements, including development of X-energy’s planned Tennessee fuel fabrication facility.
Source: canarymedia.com
