Developing the Gravity borehole reactor, a pressurized water SMR emplaced about a mile underground where hydrostatic pressure supplies operating pressure and cooling.
Putting the reactor down a deep borehole replaces the containment dome and high-pressure vessel with a mile-deep water column at roughly 160 atm, which is the cost and licensing argument — less steel, less concrete, and a target six-month deployment for an nth-of-a-kind unit. The company is aimed squarely at data centers and industrial loads rather than the utility grid, with commercial operation targeted for 2027–2028. It went public in June 2026 under ticker FISN and received a DOE nuclear safety design agreement in August 2026, though its 18.5 GWe pipeline is non-binding letters of intent, not contracts.
- Headquarters
- Berkeley, CA
- Employees
- 11–50
- Business model
- Asset owner
- Ownership
- Public
- Founded
- 2023
No queue positions recorded under this name. Expected for software, capital and supply chain companies, which do not hold interconnection requests.
- · Curated research
Written profiles are hand-entered and not independently verified. Queue figures are computed from ISO interconnection data and reflect requested capacity, not built capacity.