North Sea oilfield where CO2 is pumped under the seabed to become large-scale storage site

Greensand Future will reuse the almost‑depleted Nini oilfield and the Siri platform to inject captured CO2 beneath the seabed, aiming to store about 400,000 tonnes this year and potentially up to eight million tonnes annually by 2030.

Helicopters reach platforms roughly 250 km off Denmark's west coast to access the Nini oilfield and the larger Siri "mother platform." The almost‑depleted field is being repurposed for Greensand Future, a commercial project led by a consortium including Ineos Energy to inject captured carbon dioxide beneath the seabed. Organisers say commercial operations will begin in the coming months. The project is presented as part of wider efforts in the North Sea to use existing offshore expertise and infrastructure for carbon storage. Key facts: - Greensand Future plans to reuse the Nini field and the Siri platform to store captured CO2 under the seabed. - The consortium says it will store about 400,000 tonnes of CO2 this year and could scale to around eight million tonnes a year by 2030. - Scientific and policy bodies such as the IPCC and IEA have described carbon capture and removal as tools alongside emissions cuts, and the EU has linked CCS to its net zero goals. - Critics, including Greenpeace Denmark, warn CCS could reduce incentives to cut emissions and raise concerns about using seabed space for long‑term storage. - Geological experts from GEUS report that the local rock has porous layers suitable for storage and an almost‑kilometre thick clay cap rock that can act as a seal, and that North Sea sites benefit from existing exploration and infrastructure. Summary: If it proceeds as planned, Greensand Future would be among the EU's first large‑scale offshore CO2 storage operations and the project organisers say it could contribute a notable share of Denmark's emission reductions this year. The initiative builds on decades of North Sea oil and gas experience and is expected to involve a shift in offshore work toward equipment and operations for injecting and monitoring CO2. Commercial operations are scheduled to begin in the coming months; the longer‑term scale and regulatory outcomes remain to be seen.