Kairos Power is an Advanced Nuclear Fission company founded in 2016 and based in Alameda, USA. It has raised $303M in total funding, most recently a Grant in 2024.

U.S. Army selects five companies for $2.2B microreactor deployment at military installations, including Kairos Power, X-energy, and TerraPower.
Kairos's proprietary reactor design using pebble-bed TRISO fuel cooled by liquid Flibe (lithium fluoride / beryllium fluoride) salt at low pressure. Operates at high temperatures (650°C+) for industrial heat or power generation, with inherent safety from the physics of the fuel and coolant. The commercial KP-FHR targets 150-300 MWe per unit for utilities and industrial customers.
A 35 MWth non-power demonstration reactor under nuclear construction at Oak Ridge, Tennessee — the first advanced reactor to receive an NRC construction permit in decades. Hermes de-risks the KP-FHR design and validates manufacturing processes. The follow-on Hermes 2 (50 MW) has a signed PPA with TVA and Google, targeting grid power delivery by 2030.