This topic has been covered briefly in other threads but none really summarize as well as this article does so i thought id share the link
http://www.ere-homes.com/blogs/2015/03/ ... rty-dubai/
Its definitely alot different that other countries as costs can built up from other mediums i.e. DEWA, chiller costs etc.
Give it a read and let me know what you think. Hope it helps!