SEA Gas was established in 2002 to develop, own and operate the 700km underground high pressure natural gas pipeline transmission system from Port Campbell in Victoria, connecting the Otway and Bass Basins, to Adelaide in South Australia.

SEA Gas is a partnership owned by both APA Group (50%), an ASX top 50 company, and REST [Retail Employees Superannuation Trust] (50%), an industry superannuation fund.