Kairos Power is developing the KP-FHR — a fluoride salt-cooled high-temperature reactor using TRISO pebble fuel in a molten lithium-fluoride beryllium-fluoride salt coolant at atmospheric pressure. In October 2024 Google signed a Master Plant Development Agreement for 6-7 Kairos reactors supplying up to 500 MW by 2035 — the world's first corporate agreement for multiple deployments of a single advanced reactor design. The NRC approved the Hermes demo reactor construction permit in December 2023 with construction underway at Oak Ridge, Tennessee. Kairos raised $136 million in its Series B in August 2025.
Bill Gates-led investors, venture capital, DOE