-- Targeting First Commercial Operations in 2027-2028 --

Deep Fission, Inc. (NASDAQ:FISN) ("Deep Fission" or the "Company"), an advanced nuclear energy company developing small modular pressurized water reactors installed one mile underground, today announced it has signed Letters of Intent (LOIs) with data centers, co-developers, industrial parks, and strategic partners representing up to 18.5 gigawatts (GW) of potential generation capacity.

The Company is currently advancing its first reactor project at the Great Plains Industrial Park in Parsons, Kansas as part of the Department of Energy’s Reactor Pilot Program. It has completed drilling of its first data acquisition borehole to approximately 6,000 feet deep. Deep Fission’s next milestones will first demonstrate the ability to drill a commercial-scale borehole and then safely deploy a prototype reactor.