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The multi-billion dollar returns from SpaceX and Anduril have demonstrated that capital-intensive, long-horizon hard tech companies can achieve venture-scale exits, prompting generalist firms like Thrive Capital and Valor Equity Partners to allocate to nuclear startups despite traditional 10-year fund timelines.

Microsoft, Amazon, Meta, and Google are signing power purchase agreements with nuclear startups (fission SMRs and fusion) to secure carbon-free baseload for AI data centers, but the sector's extreme capital intensity and long timelines suggest a severe shakeout within a few years as many ventures fail to commercialize.

Nuclear energy as a venture play is driven by AI data center power demand, but it resembles previous alternative energy waves that burned investors. These companies are experimental, capital-intensive, and won't prove business models for years. A severe shakeout is likely within a couple of years, though some companies may reinvent themselves for new demand cycles, as Bloom Energy did. The success of hard-tech bets like SpaceX and Anduril has encouraged some generalist firms to enter, but most traditional VCs remain cautious.