The state-owned utility needs to replace the generation capacity it will lose by closing down all its coal-fired power stations over the next four years.
The Santos-owned 220 terajoules a day Devil Creek domestic gas plant processed gas from the Reindeer field from 2012.
By 2025, production was low and intermittent.
Santos' Reindeer gas field will fill with water sooner than expected and the production loss will add to concerns about the supply of gas to WA this decade.
