Raised
Private and public equity. Never added to federal money.
No raised money on record.
Kairos Power
Developer of the Hermes 2 low-power test reactors in Oak Ridge, Tennessee.
Deployment stage6 / 8Physical
Race position
Megawatts at their strongest documented state, as of 2026-08-06.
DesignKP-FHR
Per unit140 MWe
LaneGrid-scale SMR
ListingPrivate
Commercial product rating. Hermes 2 is a ~20 MWe demonstration plant.
Nuclear construction · 20 MWe
One gigawatt is 8 × 140 MWe units. 20 MWe rest on an executed action, 2% of the way there.
Why this company is on the board: Hermes 2 holds the first NRC construction permit for a power-producing Gen IV reactor and is under construction. Source ↗
Funding
Three frames, never added together.
Awarded
Federal awards and cost share. A ceiling, not cash received.
Borrowed
Debt, repayable. Never counted as a raise, federal or private.
No borrowed money on record.
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.
- 2026-05NRC extended the Hermes 1 construction-completion deadline from 2026-12-31 to 2029-04-30Permit / authorization · VerifiedSource ↗
Physical progress
Work at a site. Criticalities are proof the physics works, not electricity.
- 2026-04Groundbreaking at Hermes 2, the first power-producing Gen IV reactor to hold an NRC construction permitConstruction start · Company-reportedSource ↗
Program selections and agreements
Being chosen for a program, or signing one. Neither is a permit nor work at a site.
Nothing on record in this lane as of 2026-08-06.
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
- 2026-0420 MWe · Nuclear constructionHermes 2, Oak Ridge · two 35 MWt reactors on one power system, 20 MWe combined. Kairos frames the same plant as supplying up to 50 MW to the TVA grid. · Press-reportedSource ↗
Announced, non-binding
- 2024-10480 MWeGoogle master plant development agreement · remainder of the stated 500 MW by 2035 beyond Hermes 2 · Company-reportedSource ↗
Company-stated targets
What the company says, printed beside what a regulator has documented. The site never averages a target into a prediction.
- Stated 2026-04Hermes 2 operating by December 2027Documented state today: Nuclear construction · 20 MWe · Press-reportedTarget source ↗
TechnologyFluoride salt-cooled high-temperature reactor
Reactor classesGen IV · Test reactor
Tracked projects1
Highest deployment stage6 · Physical
Primary sourceNRC Hermes 2 record ↗