The trouble with wind
South Australia has on average over 40 per cent of its internally generated electricity derived from wind. This is one of the highest levels in the world for a load with a relatively small interconnection with other sources (the two interconnectors with Victoria have a capacity to supply about 20 per cent of the state's needs).
Wind/solar generation has two features that are of concern.
The first is that it is intrinsically high cost. As a mature technology, it will remain three times the cost of coal powered generation in Australia. It can only compete because it is subsidised by a regulatory charge on the consumer (thereby also not facing the same scrutiny if its support was through the Budget). It receives the subsidy whenever it runs, hence wind has an incentive to generate whenever it can, forcing established fossil fuel plant to be placed offline.