It looks like they're water storage ponds. Cut from the Wiki[1] article "Water consumption for the Ouarzazate Noor complex is estimated at 2.5 to 3 million m3 p

It looks like they're water storage ponds. Cut from the Wiki[1] article "Water consumption for the Ouarzazate Noor complex is estimated at 2.5 to 3 million m3 per year for one wet- cooling project (Noor I) and two dry – cooling projects (Noor II and III) and due to the need to regularly clean the reflectors." [1] https://en.wikipedia.org/wiki/Ouarzazate_Solar_Power_Station https://en.wikipedia.org/wiki/Ouarzazate_Solar_Power_Station