I would appreciate guidance on any sources of published peer-reviewed information (articles, reports) on costs of desalination plants in the Middle East and North Africa (MENA) Region?
The following paper may be of interest in respect of your question:
Ghaffour, N., Missimer, T. and Amy, G. Technical review and evaluation of the economics of water desalination: Current and future challenges for better water supply sustainability. Desalination 309 (2013) 197–207.