Deep Fission, Inc. (FISN)

Profile

https://deepfission.com

Deep Fission, Inc. is an advanced nuclear energy company developing small modular pressurized water reactors designed to operate approximately one mile underground. Its core Gravity Nuclear Reactor concept places a compact pressurized water reactor in a deep vertical borehole, using hydrostatic pressure and surrounding geology to simplify surface infrastructure and enhance safety. The company focuses on delivering reliable, low-carbon baseload power for utilities, energy-intensive industrial users, and large-scale data centers, including cloud and AI workloads. Deep Fission uses established pressurized water reactor technology and readily available low-enriched uranium fuel, aligning with existing nuclear supply chains and regulatory frameworks. Headquartered in Berkeley, California and founded in 2023, the company is engaged with the U.S. Nuclear Regulatory Commission on pre-application activities for its first borehole reactor design and participates in the U.S. Department of Energy’s Reactor Pilot Program, underscoring its role in the emerging advanced nuclear and small modular reactor segment of the energy market.