There were some other interesting observations.

In Queensland, the growth in both rooftop and utility scale solar pushed down the price of wholesale price – to below 60/MWh for more than one third of the time during the quarter, particularly during the day.

That meant that despite an increase in average availability of 265MW from the state’s considerable coal fleet, the average generation actually reduced by 155MW due to the increase in the duration of lower priced periods.

In NSW, the ageing coal fleet recorded its lowest availability since Q2 2016, largely due to extended unit outages at Bayswater and Vales Point power stations.

But despite a 1,160MW decrease in availability of New South Wales coal-fired generation, there was only a 110MW reduction in actual output as plants were run harder and some actually shifted from $80- $100/MWh price bands to $60-80/MWh price bands.

Gas generation also continued its downward trend, and for the first quarter on record, the total share of gas generation was lower than wind output, and at its lowest level since 2006.

The increase in rooftop PV demand also contributed to a reduction in grid demand in Victoria and South Australia


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