The hub study area comprises CO2 sources in Iowa, Kansas, and Nebraska and CO2 sinks in Kansas and Nebraska, representing the first potential large-scale project for the Midcontinent region.

The stacked storage corridor is characterized by alternating sequences of deep saline formations, oil-bearing reservoirs, shale, and evaporite units that are conducive to vertically stacked CO2 injection for geologic storage and enhanced oil recovery.

There are three potential sites for the project: one in southwest-central Nebraska, Sleepy Hollow Field, a second in southwestern Nebraska near Madrid, and a third in southwestern Kansas, the Patterson Site.

Commercial-scale CCUS is feasible at two candidate storage sites studied, the Madrid, Nebraska Site and the Patterson Site in Kearny County, Kansas. The Sleepy Hollow Field in Nebraska was found to be an attractive candidate for stacked storage with CO2-EOR.