Deep Fission
Updated: August 19, 2026
CEO - Elizabeth Muller
Country: USA | Funding: $114M (+)
Founded: 2023
Website: https://deepfission.com/
Deep Fission wants to build reactors a mile underground. Thus by using the natural conditions deep under the earth’s surface it can eliminate the need for the large pressure vessels and containment structures needed in traditional pressurized water reactor designs. The startup claims this will significantly reduce costs while enhancing safety, sustainability, and operational efficiency. Its reactor is designed to use conventional low-enriched uranium fuel and an existing supply chain, sidestepping a significant source of delay and concern for other advanced reactor designs. The company is targeting use cases including AI data centers.
Founded: 2023
Website: https://deepfission.com/
Deep Fission wants to build reactors a mile underground. Thus by using the natural conditions deep under the earth’s surface it can eliminate the need for the large pressure vessels and containment structures needed in traditional pressurized water reactor designs. The startup claims this will significantly reduce costs while enhancing safety, sustainability, and operational efficiency. Its reactor is designed to use conventional low-enriched uranium fuel and an existing supply chain, sidestepping a significant source of delay and concern for other advanced reactor designs. The company is targeting use cases including AI data centers.
