Doog,

Any pinhead that can read can see that presently, the only power that is dispatched is gas or diesel fired plants, that simply don't generate, and all solar/wind is used or very occasionally exported.

So the batteries will be buy gas generated power at points of low demand and then selling at high demand, competing against the gas generators that it bought its power from originally. Its business case hinging on the few times where there is a shortage of capacity?

It sounds high tech and cool, but as a commercial concept it is a dumb as mud, and the schmucks that will pay for it will be the SA power consumers.