Deep Fission (FISN) signed a binding 25-year Master Energy Purchase Agreement with Great Plains Development Authority for a planned commercial power project.
The agreement converts a December 2025 letter of intent into a definitive contract at the site of Deep Fission’s Department of Energy pilot in Parsons, Kansas. Deep Fission anticipates an initial 150 MW phase, targeting commercial operation on September 30, 2028, with later phases reaching up to 2,000 MW by 2031, pending further demand growth.
Deep Fission is bound to pursue the project and supply power once licensed and operating. GPDA will purchase available electricity for industrial park tenants up to contracted capacity, but has no minimum purchase obligation. GPDA may assign its purchase obligations to qualifying tenants.
Deep Fission (FISN) Co-Founder and CEO Liz Muller is being honored by Goldman Sachs among its Most Exceptional Entrepreneurs of 2026. Goldman Sachs selected Muller from entrepreneurs across multiple industries for recognition at its two-day Builders and Innovators Summit in Healdsburg, California. Muller leads Deep Fission's development and commercialization of an underground nuclear energy system.
Deep Fission (FISN) will host a business update call on October 20, 2026, at 11:00 a.m. ET.
Management will discuss progress toward commercial deployment, followed by a question-and-answer period. A live webcast will be available on the company’s Investor Relations website, with a replay available shortly after the call concludes.
Deep Fission (FISN) management will participate in three October investor conferences and hold one-on-one meetings with investors.
The ROTH Emerging Nuclear Technology Conference is in New York City on October 1, 2026. The TD Cowen 11th Annual Nuclear Roundtable is virtual on October 8. The Maxim Growth Summit 2026 runs October 12–14 in New York City, with Deep Fission’s investor meetings scheduled for October 13.
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Deep Fission (FISN) announced a collaboration with Youngquist Brothers to advance deep, large-diameter borehole drilling for its underground small modular reactor deployment model.
The partners will evaluate and test drilling and borehole-construction methods, building on Youngquist’s experience drilling large-diameter wells to depths of more than 8,000 feet. On September 3 in Fort Myers, Deep Fission lowered and retrieved a 30-inch full-size prototype reactor canister into a 34-inch borehole to a depth of about 100 feet using Youngquist’s proprietary technologies, in a demonstration focused on installation and retrieval mechanics. The work supports Deep Fission’s Gravity™ pressurized water reactor concept, which places reactors roughly a mile underground, with commercial deployment targeted as early as 2027.
Deep Fission (FISN) publicly released its U.S. Department of Energy–approved Nuclear Safety Design Agreement (NSDA) for the Gravity™ pilot reactor in Parsons, Kansas. DOE approval of the NSDA is described as the initial step in the safety review process under the DOE Reactor Pilot Program established by Executive Order 14301.
The NSDA sets the agreed safety framework, defining design requirements, planned safety analysis, and regulatory engagement for the underground small modular pressurized water reactor, which uses standard low‑enriched uranium fuel. Deep Fission is the first company in the program to publish its complete NSDA, with limited security‑related redactions, and the company intends, subject to further DOE authorization and NRC licensing, to convert the pilot unit to commercial operation rather than decommission it after initial testing.
Deep Fission (FISN) successfully installed and retrieved a full-size prototype reactor canister using standard commercial drilling equipment operated by a commercial crew.
On September 3, 2026, the team lowered a 20-foot, non-nuclear canister to a depth of 100 feet inside a 34-inch-wide borehole, aligned it, and brought it back to the surface, demonstrating the emplacement and retrieval sequence underlying the company’s deployment model. The canister is a full-scale replica of the planned Gravity™ pressurized water reactor housing.
The company highlights that all equipment used is already in commercial service and that its design relies on mature commercial drilling and pressurized water reactor technology. Deep Fission also recently received U.S. Department of Energy approval of its Nuclear Safety Design Agreement for the Gravity™ reactor under the DOE Reactor Pilot Program.
Deep Fission (Nasdaq: FISN) has appointed veteran HR executive ShawnTrell Scales as its first Chief People Officer, leading people strategy as the company moves from first-of-a-kind nuclear reactor demonstration toward commercial deployment. Scales brings over 20 years of HR leadership across energy, manufacturing, and agtech, most recently serving as Chief Human Resources Officer at Farmer's Business Network. Her remit includes talent strategy, organizational design, employee relations, and culture as Deep Fission scales its workforce to support development of its underground Gravity™ Nuclear Reactor. The company recently received U.S. Department of Energy approval for its Nuclear Safety Design Agreement, targeting delivery of its first full-power reactor in 2027.
Deep Fission (Nasdaq: FISN) announced that the U.S. Department of Energy has approved its Nuclear Safety Design Agreement (NSDA) for the Gravity™ underground nuclear reactor, a key regulatory milestone enabling advancement within the DOE Reactor Pilot Program.
The NSDA approval sets the safety framework for continued development and progression toward demonstration. Deep Fission is advancing its commercial pilot at Great Plains Industrial Park in Parsons, Kansas, where it has drilled a 6,000-foot data acquisition well and delivered a prototype reactor canister, aiming for a demonstration unit intended to transition to Nuclear Regulatory Commission-licensed commercial operation after initial testing and DOE authorization.