US advanced reactor developer Deep Fission has signed a binding 25-year electricity purchase agreement for a planned nuclear power project in Kansas, with an initial generating capacity of up to 150 MW and potential expansion to 2,000 MW.

Deep Fission, which aims to place small modular reactors (SMRs) in boreholes one mile beneath the Earth’s surface, said the agreement with the Great Plains Development Authority (GPDA), which owns the Great Plains Industrial Park in Parsons, Kansas, replaces a letter of intent signed in December 2025.