North Sea Project Greensand confirms feasibility of safe CO2 storage

INEOS Denmark and its 23 partners have submitted a final report on Project Greensand, their pilot carbon capture and storage (CCS) development in the Danish North Sea.

The purpose of the pilot was to develop, test and demonstrate safe and efficient CO₂ storage in the North Sea subsurface. Technical verification confirmed that the stored CO₂ remains safely and permanently in the Nini West reservoir 1,800 m subsurface.

DNV provided independent verification of the results.

In mid-2023, Project Greensand received official safety approval from DNV. The classification society said at the time that the safety verification followed years of involvement in the entire value chain’s concept, design, components, underground sites and facilities. DNV said this safety verification covered everything from the fabrication by the individual subcontractors to the actual offshore installation.

Mads Gade, country manager at INEOS Denmark and commercial director at INEOS Energy, said, “We now have documentation that we have a well-functioning storage for CO₂ in the North Sea subsoil, where large amounts of CO₂ that would otherwise have been emitted into the atmosphere can be safely and permanently stored. We can see that the stored CO₂ behaves as expected in the reservoir 1,800 m below the seabed. That confidence gives us a solid foundation to take the next steps that will be crucial for CCS in Denmark.”