We're full over here in the East unless you go between Chantaburi and Trat, or closer to Bangkok in the swamp land of Samut Prakan. That leaves the southern peninsula and your salt flats south of Bangkok.
I'll start a poll on this and we'll see what they publish in upcoming months. I'm sure the environmental people will stay on this like a hot potato and let the world know before EGAT does when they decide on a location. Pete

PS: I may have a bad year above. I recall the article saying "5 years for planning and 6 years for construction...." which would make it 2018?