UAE's plants are, certainly in retrospect and probably earlier, a mistake. They produce output at something like 5x the cost per kWh of what utility scale solar can achieve there (about $0.013/kWh for large utility scale solar). In the time between the process to build those plants was started and when they came online, solar has crashed in cost by nearly an order of magnitude.

I believe the UAE's plants are being built by the south Koreans, who have been the biggest builders this century. Unfortunately even with so many plants being built south Korea has been unable to lower costs.