There is also another plant planned by Aquasol to be built near Pt Augusta.
http://www.solardesalination.com.au/This is to be a solar powered plant.
I haven't been able to read all the posts on this ever expanding forum, but one concern which people have raised about the upper gulf proposals is that the tidal movement will not be sufficient to dispurse the brine when it is deposited back into the sea.