The agreement with Diamond Gas International is a contractual commitment for the sale of 1.5 million tonnes a year of Santos equity LNG from Barossa - with extension options - at a price based on the Platts Japan Korea Marker.
Santos chief executive officer Kevin Gallagher said the agreement was another step towards a final investment decision on Barossa, which is targeted for the first half of 2021.
Santos holds a 62.5 per cent operated interest in the Barossa joint venture.
Shares in Santos (ASX:STO) Shares are trading 2.28 per cent higher at $6.50