Parsons

G1 Data Acquisition Well Complete

As of June 2026, Deep Fission has completed drilling of its data acquisition well to a depth of approximately 6,000 feet. This well will provide critical geological, hydrological, and thermal data to inform engineering design, safety analysis, and regulatory planning for our Gravity Reactor technology.

We have also finished ground preparations for our second test well and brought in additional trailers to support the needs of our construction and field teams as work on-site has expanded.

The second well is intended to test borehole thermal behavior and to demonstrate deep deployment (~2,500 ft) of major components, including lowering a prototype reactor underground to help validate key aspects of our deployment approach.

We believe this next phase will play an important role in advancing site characterization and development efforts as we continue progressing toward deployment of our one-mile-deep nuclear energy systems.

A Successful DOE Pilot Is a Win for Parsons

The DOE reactor pilot is a single demonstration reactor in a single borehole. Anything beyond that single reactor depends on how the pilot performs and on further regulatory approval.

For commercial operation, we intend to apply for a commercial license with the Nuclear Regulatory Commission (NRC) — the independent federal agency responsible for ensuring the safety and security of civilian nuclear facilities in the United States. We have been engaging with the NRC since May 2024 in a pre-application process, and the current schedule targets as early as 2027 to seek high-volume commercial licensing with the NRC. [5]

Any commercial expansion at the Great Plains Industrial Park would be a separate, publicly visible decision and would proceed only after the pilot phase has demonstrated the safety case and after the required federal and local approvals are in place.

A Clear Governance Framework in Kansas

Kansas law today requires that power generated by commercial energy projects be sold to a regulated utility, which then delivers electricity to customers across its service territory. The rules governing how power is sold are set by the Kansas Corporation Commission (KCC).

Kansas also has rules in place that are specifically designed to keep large customers from shifting costs onto residential bills. In November 2025, the KCC approved the Large Load Power Service (LLPS) rate plan, which requires customers above 75 megawatts (data centers, large industrial loads) to pay for their own grid upgrades, pay up to 20% above standard rates, and meet a minimum bill at 80% of contract demand. [6]

Stepping back, the Southwest Power Pool region, which includes Kansas, is approaching a tight period for generating capacity, with capacity above peak load forecast to fall from about 20.7% in 2025 to roughly 1.9% by 2029 absent new generation. Adding firm, round-the-clock power inside that footprint can support the kind of economic development that brings investment, jobs, and new industry to communities like Parsons. [7]

Oversight at Each Step of the Process

Deep Fission is subject to layered federal and state oversight. The pilot at GPIP operates under U.S. Department of Energy authorization through the Reactor Pilot Program, established under Executive Order 14300 (May 23, 2025). Any commercial reactor at the site requires a separate Nuclear Regulatory Commission (NRC) commercial license; we have been engaging with the NRC since May 2024 under a documented Regulatory Engagement Plan. At the state level, the Kansas Department of Health and Environment (KDHE) oversees water, air, and waste permitting that apply to the project. Every step of the DOE, NRC, and KDHE review processes is subject to documented public visibility. [1] [5]

Our design utilizes pressurized water reactors, a mature technology that makes up roughly 70% of the world's operating commercial reactor fleet today. The U.S. commercial nuclear fleet—predominantly PWRs—has operated since 1957 without a single radiation-related public fatality.

The reactor’s emplacement a mile underground is designed to strengthen the safety case. The surrounding rock provides natural shielding between the reactor and the surface. The mile-tall column of water above the reactor is intended to make the pressure inside the reactor canister nearly equal to the pressure of the water outside it—mitigating risk from the traditional "loss of coolant" accident that drives much of nuclear risk planning at surface plants. And the same water column provides a passive supply for emergency cooling. [2]

Three Layers of Protection

Three layers of protection sit between the reactor and any water at the surface.

• The reactor itself is sealed inside a steel canister.
• The canister sits inside a borehole that is lined with sealed steel casing and cement from the bottom up, topped with a sealed closure device welded to the casing at the wellhead.
• The reactor is embedded in several thousand feet of Precambrian granite—crystalline rock largely impermeable to water and dissolved material. [2]

According to the Kansas Geological Survey and the U.S. Geological Survey, freshwater aquifers in this part of southeast Kansas generally do not extend deeper than about 1,000 feet below ground. [9] [10]

The reactor itself uses water inside a closed-loop system. The full volume of the closed loop is roughly 350,000 gallons — about one-quarter of what the City of Parsons consumes in a single day.

Surrounding groundwater conditions will be monitored continuously to confirm that water quality is being protected, a regulatory commitment under both the DOE pilot authorization and the NRC commercial licensing pathway. [11]

Safe and Secure Options in Accordance with NRC rules

Like every nuclear reactor, the Gravity Reactor will produce used nuclear fuel that has to be stored and ultimately disposed of in accordance with applicable laws and regulations. [8]

Depending on the long-term disposal pathway, this may require interim on-site storage, transportation, and coordination with governmental authorities or third-party service providers. Our deployment model currently anticipates safe interim storage, pending identification of national, long-term storage solutions. The management and disposition of used nuclear fuel will be conducted in compliance with applicable laws and regulations.