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Army Launches Janus Program to Field Commercial Microreactors at U.S. Bases by 2028

A COTS‑inspired, milestone model with DIU and DOE labs seeks to jump‑start a microreactor market and cut fuel logistics risk.

Overview

  • Army officials said the program will commit hundreds of millions of dollars over five years to accelerate commercially built microreactors for military power.
  • Reactors will be developed and operated by private companies under Army oversight using a milestone-based contracting approach modeled on NASA’s COTS.
  • The effort targets a domestic base deployment by 2028 under a presidential directive, with initial hardware not expected before 2027.
  • Multiple vendors are expected, with each building at least two units to progress from a prototype to a refined follow-on design.
  • Initial units will stay stateside as the Army builds supply chains and certification pathways, with future expeditionary use envisioned and industry momentum signaled by new factory plans in Tennessee.