Energy giants Equinor, Shell and Total have signed off on a NKr7 billion ($685 million) plan to build what would be the world’s first carbon capture and storage (CCS) network — the Northern Lights project off Norway.

The flagship CCS development – the lead-off well for which was drilled late last year – could eventually capture and store up to 5 million tonnes of CO2 from heavy-emitters around the EU in a giant saline aquifer south of the Troll offshore oil and gas field in the North Sea.