The Department of Energy has established a categorical exclusion that allows certain advanced experimental nuclear reactors to bypass the full requirements of the National Environmental Policy Act (NEPA), including preparation of Environmental Impact Statements (EIS) or Environmental Assessments (EA).
Announced in a Federal Register notice, the department said the exclusion is justified by inherent and passive safety features in the new reactor designs, along with fuel types and limited fission product inventories that, in DOE’s view, reduce the potential for adverse impacts during construction, operation and decommissioning. DOE also said environmental analyses for individual reactors would be informed by prior reviews of similar technologies.
The policy change follows a May 2025 executive order from President Trump directing steps to accelerate deployment of advanced reactors. It came days after an NPR report that DOE officials had rewritten internal environmental, safety and security rules in ways that were shared with companies but not publicly disclosed. That reporting said the internal edits softened protections for groundwater and the environment, replacing firm language that the environment ‘‘must’’ be protected with language saying agencies ‘‘may be given to avoiding or minimizing, if practical, potential adverse impacts.’’
The new exclusion could shorten or streamline NEPA review for projects in DOE’s Reactor Pilot Program, which seeks to have at least three advanced test reactors operating by July 4. About a dozen startups, backed by billions in private capital including Silicon Valley investment, are developing reactors at sites across the country. Supporters say the reactors will serve new electricity loads such as AI data centers. DOE has said applicants can request a streamlined NEPA approach and that each company’s analysis would draw on previous environmental reviews of similar designs. DOE’s supporting record frames these reactors as having attributes that limit the consequences of possible radioactive releases.
Reaction split along predictable lines. Proponents welcomed the exclusion. Adam Stein, director of nuclear energy innovation at the Breakthrough Institute, described the step as expected and appropriate for some reactor types, noting that past DOE-built reactors did not demonstrate significant environmental impacts. He also said public participation matters but questioned whether standard NEPA comment processes meaningfully change project outcomes.
Critics warned the change reduces oversight and public input. Edwin Lyman of the Union of Concerned Scientists argued that many proposed designs exist mainly on paper and lack operating experience, so they should be subject to rigorous environmental and safety review; he warned any reactor can be susceptible to severe accidents. Kathryn Huff, a former head of DOE’s Office of Nuclear Energy who reviewed the internal rule edits, said those rewrites loosened protections and should have been exposed to public scrutiny.
Opponents also said streamlining or removing NEPA steps could limit communities’ opportunities to weigh in on siting, groundwater safeguards and potential accident consequences. They contend that cutting corners on safety, security and environmental protections poses risks to public health and the environment.
DOE defended the changes, saying the new rules and the NEPA approach continue to protect people and the environment and that the department follows applicable Environmental Protection Agency requirements. The agency clarified that the categorical exclusion they created is not automatic: individual reactor companies must apply to use the exclusion category for their projects.
Clarification: This article has been updated to reflect that DOE created a new exclusion category for certain reactors; individual reactor companies must request to use that exclusion.