NNSA today issued its Final Site-Wide Environmental Impact Statement and Record of Decision to implement an Expanded Operations Alternative to manage Los Alamos National Laboratory in the coming years.
National Nuclear Security Administration
March 25, 2026
minute read time
WASHINGTON — The U.S. Department of Energy’s National Nuclear Security Administration (DOE/NNSA) today issued its Final Site-Wide Environmental Impact Statement and Record of Decision to implement an Expanded Operations Alternative to manage Los Alamos National Laboratory (LANL) in the coming years.
The Record of Decision accompanies completion of LANL’s Sitewide Environmental Impact Statement, which followed the National Environmental Policy Act to evaluate potential environmental impacts of three options for continuing LANL operations through approximately 2038.
The Expanded Operations Alternative will enable LANL to undertake the construction and operation of new facilities designed to expand LANL’s existing capabilities. Some of the activities included in the Expanded Operations Alternative include construction and operation of an additional supercomputing complex and a new x-ray-free electron laser facility, which will complement the capabilities of the Los Alamos Neutron Science Center (LANSCE).
The Final LANL SWEIS, the Record of Decision and other associated documents are at: https://www.energy.gov/nepa/doeeis-0552-site-wide-environmental-impact-statement-continued-operation-los-alamos-national-0. Notice of the SWEIS will also appear in the Environmental Protection Agency’s weekly Notice of Availability in the Federal Register for NEPA documents.