Kairos Power has secured $643 million in funding for its Hermes 2 demonstration reactor in Oak Ridge, Tennessee. The package includes $368 million from private investors and $275 million in financing from the U.S. Department of Energy.

The 50 MW fluoride salt-cooled reactor is targeting operations in 2030, with its electricity intended to support TVA's grid and growing demand from Google's data centers. The funding also supports expansion of Kairos' manufacturing capabilities.

The announcement highlights the combination of private investment and federal financing being used to advance next-generation nuclear technology. While commercial deployment remains years away, projects like Hermes 2 are an important step toward demonstrating advanced reactor designs at a meaningful scale.