Nucleation Capital is a venture fund founded in 2018 by Valerie Gardner and Rod Adams, focused on investing in advanced nuclear, carbon management, and grid-enhancement technologies to accelerate the transition away from fossil fuels. The firm operates Fund I, an evergreen venture fund for accredited investors committing up to $3 million over three years, and is forming Fund II, targeting $250 million or more for investors committing $5 million and above with a first close planned for 2026. Nucleation also runs a syndicate network for deal-by-deal nuclear and climate investment opportunities. The firm invests across a range of atomic energy innovations including fission, fusion, low-energy nuclear reactions (LENR), radioisotope thermal generators, carbon capture and synthesis, and grid modernization technologies. Portfolio companies include ventures that achieved nuclear criticality milestones and Deep Isolation, now publicly trading. Nucleation operates as a virtual firm with headquarters in the San Francisco Bay Area.

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