Hi Gerry, the following link ...
Published by Hwee See, Principal Consultant at Mott Macdonald
Hi Gerry, the following link has a list of 100 largest desalination plants proposed, in construction, or in operation as a function of capacity, location, source of water and estimated construction and operation dates, as of January 1, 2005 - a decade old! so not sure if it is still of interet to you.
http://worldwater.org/wp-content/uploads/sites/22/2013/07/Table21.pdf