Our electricity grids are clearly under stress as evidenced by these booming AEMO daily average prices. On 6 June I blogged – Surge in wholesale electricity prices last week – and I expected the daily average AEMO prices for the four States would return to be mostly under $50 again. Not so, the South Australian price is trending over $100 and the three big States are near $100 on the 30 day average.
Eventually these booming power prices will feed into power bills and the media is ignoring the issue. NemWatch is worth checking to see which State is generating from what source at any point in time.
Power prices set to rise following legal challenge 27 Feb 2016 Not sure if issues talked about in this SMH article can explain the AEMO price surge of past two months.
Yes, Let’s Triple The Cost Of Electric Power! 23 June 2016 a Wentworth Report by David Archibald.
AEMO annual av RRP 1999-2016 financial years. (RRP = regional reference price)

Comments – anybody know why SA was high in 1999?
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The Carbon Tax peak shows clear in 2013-14 then RRP seemed to settle in 2015.
AEMO monthly av RRP financial year 2016

Comments – SA was high in winter 2015. Qld spike Feb 2016 is a mystery so far.
Remember the Port Augusta coal fired stations shut on 9 May – so SA price increases in May & June not that odd as supply tightened. But why do the three large States with ample coal generation also show major RRP increases in May and June?

I should have included this price graphic in my March blog – Tasmanian electricity crisis explained day by day
Now it is crystal clear to see that Tasmania initiated power exports when the Victorian RRP rose through ~$80(per MWhr) and exports ceased when Vic RRP fell back. Looking at my March chart of the 5 minute data from 15th to 21st Dec 2015 it is clear that imports ceased just prior to exports being commenced and vice versa. I have no idea what stresses can be induced in a cable when the current is reversed frequently like this. It is also worth noting that the export MW exceeded the import MW. Here is the daily chart from 1 Nov 2015 to 10 Mar 2016.