Raised
Private and public equity. Never added to federal money.
Antares Nuclear
Developer of the Mark-0 zero-power experiment, the first Reactor Pilot Program project to report criticality.
Deployment stage7 / 8Operational
Race position
Megawatts at their strongest documented state, as of 2026-08-06.
DesignR1
Per unit0.3 MWe
LaneMicroreactor
ListingPrivate
200–300 kWe.
No executed or announced megawatts on record
One gigawatt is 3334 × 0.3 MWe units. No megawatts rest on an executed action yet.
Why this company is on the board: First DOE Reactor Pilot Program participant to reach criticality, at INL with the U.S. Army. Source ↗
Funding
Three frames, never added together.
Awarded
Federal awards and cost share. A ceiling, not cash received.
No awarded money on record.
Borrowed
Debt, repayable. Never counted as a raise, federal or private.
Filed, not raised
A registration filed with the SEC. The filing itself raises nothing.
No filed, not raised money on record.
Cash on hand
A balance, not a raise. Reported by the company at a stated date.
No reported cash position on record.
Licensing
Applications, permits and authorizations, naming the authority in each case.
Nothing on record in this lane as of 2026-08-06.
Physical progress
Work at a site. Criticalities are proof the physics works, not electricity.
- 2026-06-04Mark-0 reached initial criticality at Idaho National Laboratory, the first of the DOE pilot cohortCriticality · Government-reported · Zero-power demonstrator. Contributes 0 MWe.Source ↗
Program selections and agreements
Being chosen for a program, or signing one. Neither is a permit nor work at a site.
- 2026-07One of three finalists competing for Air Force installation assignments in Colorado and Montana; no award madeProgram selection / agreement · Press-reportedSource ↗
Design proof outside the U.S.
Real progress on the same design abroad. Contributes 0 MWe to the U.S. race.
Nothing on record in this lane as of 2026-08-06.
Pipeline
Executed first. Announcements are labeled as announcements and never added to them.
Backed by an executed action
No executed megawatts on record as of 2026-08-06.
Announced, non-binding
No announced pipeline on record as of 2026-08-06.
Company-stated targets
What the company says, printed beside what a regulator has documented. The site never averages a target into a prediction.
- Stated 2026-07Mark-1 producing electricity in 2027 and installation deployment by 2028Documented state today: No executed or announced megawatts on recordTarget source ↗
TechnologyHigh-temperature heat-pipe microreactor
Reactor classesGen IV · Critical experiment
Tracked projects1
Highest deployment stage7 · Operational
Primary sourceDOE criticality announcement ↗