Not sure where the power for this SKA is going to come from. Unless you're generating your own power you only have a choice between these providers:
We experience country-wide rolling blackouts daily from 8am to 10pm because the power plants have fallen into such disrepair that they break daily and reliable power supply has become impossible (Goooogle "majuba silo collapse" as an example). The other huge problem is cable theft.
So-o-o-o..... Plenty of sunlight in the Karoo. Not sure how many solar panels / wind turbines one will need to drive thousands of these 16amp processors with cooling (you're going to need it...). Not sure how you're going to keep the locals away from your copper cable (or anything metal basically, like manhole covers, train rails, trains, fence posts, ...).