Western Nebraska Sequestration Hub

The Western Nebraska Sequestration Hub (Conestoga I-1 Project), developed by Tallgrass High Plains Carbon Storage, LLC, is a Class VI carbon storage project located in Kimball County, Nebraska. It will inject captured CO₂ into the Lyons Formation, a deep sandstone reservoir with high porosity and permeability that ensures CO₂ remains in a supercritical state. The Lyons is overlain by the Goose Egg and Satanka formations, both low-permeability shale and evaporite layers that provide strong vertical containment. Extensive geologic and seismic evaluations confirm the area is structurally stable, with no faults or fractures that could compromise storage integrity. The project is designed to store 2.26 million tonnes of CO₂ annually for 12 years, with a total storage capacity of 27.1 million tonnes. One injection well (Conestoga I-1) will be constructed with corrosion-resistant casing and cement, supported by monitoring wells to track plume behavior, reservoir pressures, and groundwater quality. Computational models show the Lyons Formation has capacity well beyond the planned volumes, with secure trapping mechanisms and thousands of feet of separation from the High Plains Aquifer. Together, these safeguards position the Conestoga project as a reliable hub for long-term, large-scale CO₂ sequestration in western Nebraska.