Available Generation reduction across Loy yang A and Loy Yang B over Sunday evening was only 420MW

Alerts from NEM-Watch and ez2view yesterday evening alerted me to an AEMO Market Notice, indicating a reduction in available capacity that was expected to be of the order of 1,400MW across Loy Yang A and Loy Yang B for a 6-hour period last night.  Here’s the text of the Market Notice:


Given the growing interest in the electricity sector (especially due to this multi-faceted energy transition we’re undertaking, with part of it being growing accessibility of market data – something we appreciate the opportunity to assist with in a number of ways), it was not really a surprise when this made social media (Twitter and elsewhere).  Also not a surprise to see these sorts of announcements grow a life of their own, driven by different agendas of those involved.

This morning, with the benefit of generator bids being published till 04:00 today, we’re able to see a little more of what this actually meant in this snapshot from ez2view:


In this trend, we see trended bid stacks for the combination of Loy Yang B and Loy Yang A and note that, whilst the Market Notice talked about a reduction in output across the two stations, we see that two things happened:

1)  Available generation was only reduced by 420MW across all 6 units; whilst

2)  960MW of additional capacity was still offered to the market, but at a higher price.

Given the price offered (>$300/MWh), it was unlikely this would be called on overnight, so the AEMO dispatched the output of the 6 units in aggregate down by that combined amount (i.e. 1,380MW).  Important to note that whatever repair work was required was completed overnight, as AEMO had indicated, and the units are all back up around full load.

About the Author

Paul McArdle
One of three founders of Global-Roam back in 2000, Paul has been CEO of the company since that time. As an author on WattClarity, Paul's focus has been to help make the electricity market more understandable.

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