Demo / PilotOther / Unclassified
Mark-0
📍 IDDeveloper: AntaresVendor / Tech: Antares
Capacity
—
Expected Operation
2026
Reactor Type
Antares
Regulatory Status
Reached zero-power fueled criticality at INL 2026-06-04 (first of the DOE Reactor Pilot Program criticalities). Company developing Mark-1 electricity-producing prototype.
Details
Primary Use
Demonstration
Construction Start
2026
Research detail · verified 2026-10-10
Stage
Test reactor running
Commercial power
No (test, research, military or demonstration)
Stated target operation
Commercial units to customers in 2028 (stated by Antares, per ANS 2026-06-05)
Key dates
2025-08-12 selected for DOE Reactor Pilot Program; 2026-06-04 zero-power criticality at INL
Not verified / conflicts
Specific INL facility housing Mark-0 not stated in sources opened. No job numbers or training partnerships found. Antares's follow-on military sites (Joint Base San Antonio under Air Force ANPI; Fort Bragg under Army Janus) are separate rows.
Sources
- https://www.ans.org/news/article-8099/antares-achieves-zeropower-criticality-at-inl/
- https://www.ans.org/news/article-8178/the-deadline-arrives-checking-in-on-the-reactor-pilot-program/
- https://world-nuclear-news.org/articles/doe-announces-first-selections-for-pilot-reactor-programme
- https://www.energy.gov/node/4852259
Key Organizations
Developer
Antares
State Policy Context
View nuclear-related legislation and energy stats for Idaho