2026-22473Notice

DOE Draws a New Security Line Around a California Physics Lab

Published Date: 11/4/2026

Notice

Summary

The Department of Energy has officially set clear security boundaries around the SLAC National Accelerator Laboratory in Menlo Park, California, starting November 4, 2026. This means no unauthorized people or dangerous items can enter the 426-acre site, which is managed with Stanford University. If you work there or visit, expect new signs and fences to keep everyone safe and secure.

Analyzed Economic Effects

2 provisions identified: 2 benefits, 0 costs, 0 mixed.

Unauthorized Entry and Weapons Prohibited

Starting November 4, 2026, the Department of Energy prohibits unauthorized entry and the unauthorized introduction of weapons or dangerous materials onto the SLAC National Accelerator Laboratory property. The restriction applies to the SLAC site in Menlo Park, California, which consists of approximately 426.3 acres.

Perimeter Marked by Signs and Fencing

The SLAC boundary will be marked by signage at entrances and along the perimeter, chain link fencing, and other physical features surrounding the 426.3-acre site. If you work at or visit the site, you will see these signs and fences indicating the secured boundary.

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Key Dates

Published Date
11/4/2026

Department and Agencies

Department
Independent Agency
Agency
Energy Department
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