TechCrunch Startup News Radiant Nuclear raises $300M for its semi-sized 1 MW reactor
Dec 17, 2025
Radiant Nuclear has raised an impressive $300 million to develop a small modular reactor aimed at replacing diesel generators. The startup's valuation has soared above $1.8 billion, attracting significant investor interest. Their innovative 1 MW reactor features helium cooling and a five-month fuel life. Targeting commercial and military sites, Radiant plans to phase out diesel with flexible purchasing options. A demonstration reactor is set for testing by summer 2026, with ambitious goals for regulatory approval.
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Surge In Nuclear Funding Driven By Tech Power Needs
- Nuclear startups have drawn massive funding recently, suggesting a surge in investor interest tied to tech power demand.
- Continued tech-driven electricity needs could keep nuclear investment strong but may also create a frothy market.
AI Boom Fuels Nuclear Interest
- AI and data center growth directly increase demand for large, reliable power sources like nuclear.
- Tech companies' continuing power appetite likely sustains investor interest in fission startups.
Scaling Reactors Is The Harder Challenge
- Many startups may reach first-of reactors but fail to scale to mass manufacturing.
- Achieving criticality is easier than replicating designs cost-effectively at scale.