Centrica of the UK and US liquefied natural gas exporter Delfin Midstream have signed a £7 billion ($8.46 billion) agreement for a major LNG contract from Delfin’s proposed deep-water port off the coast of Louisiana.

The 15-year deal provides a major boost to the future prospects of the project as a decision on whether to proceed approaches.

The deal calls for Delfin to provide 1 million tonnes per annum of LNG from its Delfin Deepwater Port, which is currently in the developmental phase.