Valar Atomics, founded in 2023, has raised $450 million at a $2 billion valuation to build thousands of advanced nuclear fission reactors within a decade. The company uses TRISO fuel and helium coolant to operate reactors at 800°C, targeting industrial manufacturing customers and AI data centers through clustered 'gigasites.' They achieved zero-power criticality in November 2025 and are constructing their first reactor in Utah, aiming to demonstrate 100 kilowatts of thermal energy by July 4th. This represents a major push toward mass-manufactured small modular reactors to meet surging electricity demand from AI and industrial applications.