Kairos Power
Kairos Power is an Advanced Nuclear Fission company founded in 2016 and based in Alameda, USA. It has raised $403M in total funding, most recently a Growth in 2026.
Kairos Power was founded in 2016 and is headquartered in Alameda, USA. The company develops the KP-FHR (Fluoride Salt-Cooled High-Temperature Reactor), a proprietary reactor design that operates at high temperatures (650°C+) using pebble-bed TRISO fuel cooled by liquid Flibe salt at low pressure. Commercial units target 150–300 MWe for utilities and industrial customers. Kairos is constructing the Hermes Demonstration Reactor (35 MWth) at Oak Ridge, Tennessee, with a follow-on Hermes 2 (50 MW) under a signed power purchase agreement with TVA and Google, targeting grid power delivery by 2030. The company has raised $403 million in total funding, including a $100 million Growth round announced in September 2026 led by Samsung C&T.
Kairos is building one of the few advanced reactors with an active nuclear construction permit and a signed commercial power delivery agreement tied to AI data center demand. The capital commitments from Samsung C&T and the Google–TVA partnership position the company at an intersection of industrial heat, grid power, and infrastructure for compute-intensive applications. The Hermes demonstration validates reactor design and manufacturing at scale, de-risking commercial deployment of the KP-FHR technology.
At a glance
Total raised
$403M
Headcount
501-1k
Headquarters
Alameda
Founded
2016
Status
Private
Subsector
Advanced Nuclear Fission
Where Kairos Power ranks
Top 25 Energy companies →Funding history
Total raised
$403M
Rounds tracked
2
Latest stage
Growth
| Date | Stage | Amount | Valuation | Lead investors |
|---|---|---|---|---|
| Sep 22, 2026 | Growth | $100M | — | Samsung C&T |
| Feb 1, 2024 | Grant | $303M | — | U.S. Department of Energy |
