Kairos Power

Fluoride salt-cooled high-temperature reactor; Hermes demo with a Google PPA.

Alameda, CA, US · 2016

Small Modular Reactors View on the tracker

Milestone note Sep 23, 2026

America's first advanced reactor lost its builder mid-construction — and Korea is filling the gap

Bechtel is leaving TerraPower's Natrium plant in Kemmerer, Wyoming, after the two companies could not agree on the project's next phase; a WARN notice filed September 15 covers about 200 positions. TerraPower will rebid the EPC contract and says the 2030–31 schedule holds. The same week Samsung C&T put up to $100M into Kairos Power and joined the Hermes 2 build.

TerraPower

Kairos Power

Google Quantum AI

Press · 2026-09-22 Read

Milestone note Apr 2026

First power-producing Gen IV reactor breaks ground

Reached

Kairos Power — Kairos broke ground on Hermes 2 in Oak Ridge — the first power-producing Gen IV reactor with an NRC construction permit. The molten-salt-cooled plant will feed up to 50 MW to TVA, powering Google data centers. On 21 Sep 2026 Samsung C&T committed up to $100M — about $70M in equity, the rest as engineering services — and joined the build as a construction partner.

Small Modular Reactors

Kairos Power

Press · 2026-04 Read