Deep Fission signed a binding 25-year Master Energy Purchase Agreement with the Great Plains Development Authority for a commercial project at the Great Plains Industrial Park in Parsons, Kansas, the company said on October 20. The contract converts the parties' December 2025 letter of intent into a definitive agreement and binds Deep Fission to supply power once the project is licensed and operating.

GPDA, a quasi-municipal entity that owns the industrial park, will buy electricity from the project to meet the requirements of park tenants, up to the contracted capacity, with no minimum purchase obligation. The agreement permits GPDA to assign its purchase obligations to qualifying tenants.

The initial phase is anticipated at 150 MW, with a target date for commercial operation of September 30, 2028. Later phases would take the total to 2,000 MW, pending further demand growth, according to Deep Fission.

The project would use Deep Fission's Gravity reactor, a pressurized water reactor running on standard low-enriched uranium fuel, placed approximately one mile underground. The surrounding water column and rock are designed to provide pressure control, cooling and shielding.

The park covers more than 14,000 acres in Labette County on the site of a former U.S. Army ammunition plant. Deep Fission held a groundbreaking ceremony at the park in December 2025 for its pilot reactor under the DOE Reactor Pilot Program.