Kairos Hermes / Google Fleet
The first Gen IV construction permits in the US — and Google's 500 MW order.
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Kairos Power's Hermes demonstration reactors at Oak Ridge hold the US NRC's first construction permits for a Generation IV design (fluoride-salt-cooled). Google's October 2024 master agreement — up to 500 MW across a fleet, first unit targeted ~2030 — was the first corporate order book for SMRs, TVA purchasing Hermes 2 output.
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Record reviewed as of 2026-01-15 — see Methodology.