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Three things really:W
What has caused the surge in prices that triggered the cap?
The dramatic increase in the price of coal, gas and diesel. The latter is a minor input to generation but coal and gas are extremely important. Gas price has roughly quadrupled over the past two months on the Australian domestic market.
Technical failure at some individual generating facilities has reduced supply from those sources. Not to the point of putting the lights out, but a reduction nonetheless.
The National Electricity Market by its very design is an economic market first and foremost and suffice to say it's a long way short of optimal from a technical efficiency perspective. That mattered modestly when gas was cheap, still a waste of fuel but not a huge waste of money, but it matters a great deal when fuel costs a fortune.
That all gets lost in a huge amount of politics and ideology but suffice say my own view is that if we're to have a market with traders competing and so on well then OK, no problem, but that shouldn't be interfering with physical generation operation as it presently does.
That situation, where financial trading determines physical production, leads to some far less than desirable operation at times. It ends up with low cost plant owned by one company being underutilised whilst high cost, less efficient plant owned by someone else is running and that does include wind / solar going to waste whilst fuel is burned at times for purely financial trading reasons.
Lots of things like that but ultimately everyone just grits their teeth and makes the best of it. That it works that way is a political / ideological / economic / legal construct dating back to the 1990's, it's certainly not something a technical person came up with.
My own view, very firmly, is that physical operation needs to be separate from financial trading so as to remove such silly outcomes and doing so would be a major step forward in resolving all this. Legally and politically however that would be opening up a huge can of worms.