Kairos Power
Salt-cooled reactors for data centre power
Ranked #5 in Best Small Modular Reactor Companies.
Kairos Power, based in Alameda, California, develops fluoride salt-cooled high-temperature reactors. It began building Hermes 2, a 50-megawatt plant in Oak Ridge, Tennessee, in April 2026 as the first project under its agreement to supply Google.
At a glance
| Price from | Custom |
| Best for | Tech companies buying nuclear power for data centres |
From Kairos Power's own website.
What stands out
- Google as anchor customer
- NRC construction permits in hand
Worth knowing
- Novel coolant and fuel
- Small output per unit
How it ranks
Kairos Power is ranked 5th of 10 in Best Small Modular Reactor Companies (Lister Score 92.3).
#5 in Best Small Modular Reactor Companies · Lister Score 92.3
Kairos started construction of Hermes 2 in Oak Ridge in April 2026 after receiving an NRC construction permit..
| Rank | Best Small Modular Reactor Companies | Score |
|---|---|---|
| 1 | GE Vernova Hitachi Nuclear Energy | 97.2 |
| 2 | NuScale Power | 95.9 |
| 3 | TerraPower | 94.8 |
| 4 | Rolls-Royce SMR | 93.6 |
| 5 | Kairos Power | 92.3 |
| 6 | X-energy | 91.0 |
| 7 | Holtec International | 89.7 |
| 8 | Oklo | 88.3 |
| 9 | Westinghouse | 86.9 |
| 10 | Aalo Atomics | 85.4 |
Frequently asked questions
How does Kairos Power rank on Lister?
Kairos Power is ranked 5th of 10 in Best Small Modular Reactor Companies (Lister Score 92.3).
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