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Here are the nuclear fission startups backed by Big Tech | TechCrunch

May 26, 2025 - techcrunch.com
The demand for electricity in the U.S. has surged due to artificial intelligence, prompting Big Tech companies to explore nuclear fission as a stable and predictable power source for their data centers. This has led to a renewed interest in nuclear fission, particularly in small modular reactors (SMRs), which promise to address the limitations of traditional nuclear plants. Companies like Amazon, Google, Meta, and Microsoft are investing in or signing agreements with nuclear startups such as Kairos Power, Oklo, Saltfoss, TerraPower, and X-Energy. These startups are developing innovative reactor designs, including those cooled by molten salt or liquid metal, to provide efficient and reliable energy solutions.

Kairos Power, backed by Google, is developing reactors using molten fluoride salt, while Oklo, supported by Sam Altman, is working on liquid metal-cooled reactors. Saltfoss plans to deploy SMRs on ships, and TerraPower, founded by Bill Gates, is building a larger reactor with molten salt energy storage. X-Energy, supported by Amazon, is developing high-temperature, gas-cooled reactors. These initiatives reflect a broader trend of tech companies investing in advanced nuclear technologies to meet their growing energy needs.

Key takeaways:

  • Artificial intelligence has increased electricity demand in the U.S., leading Big Tech companies to invest in nuclear fission for stable power.
  • New small modular reactor (SMR) designs are gaining interest due to their potential cost-effectiveness and scalability, despite none being built in the U.S. yet.
  • Big Tech companies like Amazon, Google, Meta, and Microsoft are investing in or signing agreements with nuclear startups for future power supply.
  • Startups like Kairos Power, Oklo, Saltfoss, TerraPower, and X-Energy are developing innovative nuclear technologies with backing from prominent investors and tech companies.
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