Denmark Starts Subsea CO2 Storage at Greensand in the North Sea

Denmark has started injecting CO2 into a depleted North Sea oil field under the Greensand project. Operated by INEOS, the site sits 200 kilometers off the Danish coast and will store 400,000 tons of CO2 per year in its first phase. The company plans to raise capacity to between 4 and 8 million tons annually by 2030, with CO2 collected from Danish biomethane plants and shipped in liquid form from Esbjerg. This is the EU's first full-scale subsea CO2 storage site. It follows Norway's Northern Lights project, which began injecting in August 2025. Both aim to prove that offshore geological storage can handle industrial emissions from sectors like cement and steel. The EU's Net-Zero Industry Act targets 50 million tons of annual storage capacity across the bloc by 2030, so projects like Greensand will need to scale quickly. The project is a test case for ship-based CO2 transport, which may be more flexible than pipelines for smaller emitters. Cost and long-term monitoring remain open questions, but the operational start gives regulators and developers real data to work with.