# On-orbit Nuclear Power Concepts Workshop

Canonical: https://abierto.us/opportunities/darpasn2621

- Solicitation number: DARPA-SN-26-21
- Notice type: Special notice
- Status: Closed. Deadline was February 20, 2026
- Department: Department of Defense
- Agency: Defense Advanced Research Projects Agency
- Contracting office: Def Advanced Research Projects Agcy (HR0011)
- NAICS: 541715 Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
- Product or service code: AC12 National Defense R&D Services; Department Of Defense - Military; Applied Research
- First posted: December 18, 2025
- Last posted: January 12, 2026
- SAM.gov: https://sam.gov/workspace/contract/opp/4bc82ea5fe8941dba8f74364147d5631/view

## Description

The Defense Advanced Research Projects Agency (DARPA) Tactical Technology Office (TTO) is requesting information regarding technologies, spaceflight qualification testing, safe handling, and applications for on-orbit satellite nuclear power systems. Our focus is on producible, cost-effective nuclear reactors – not bespoke designs suited for a one-time demonstration.

DARPA TTO and the Department of Energy (DOE) will also hold a workshop to establish a common understanding of on-orbit nuclear power technology and challenges, facilitate community interactions and collaboration, and identify key technology risk areas that, if addressed, would enable practical implementation of on-orbit nuclear power. The workshop will be held on April 21-22, 2026 at the DARPA Conference Center (DCC), 675 N Randolph Street, Arlington, VA 22203.

## Publications

- December 18, 2025: Special notice, due February 6, 2026. Notice 3174ed2272e04af08aa369daea9b2342. https://sam.gov/workspace/contract/opp/3174ed2272e04af08aa369daea9b2342/view
- January 12, 2026: Special notice, due February 20, 2026. Notice 4bc82ea5fe8941dba8f74364147d5631. https://sam.gov/workspace/contract/opp/4bc82ea5fe8941dba8f74364147d5631/view

## Points of contact

- TTO BAA Coordinator, DARPA-SN-26-21@darpa.mil

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Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/darpasn2621.