Case Study (part 1) of Aggregate Scheduled Target on Friday 8th September 2023

On the weekend I noted that we were delving into more details about Aggregate Scheduled Target’ on a NEM-wide basis, and specifically with respect to what’s happened through Q3 – to update Appendix 4 within GenInsights Quarterly Update for 2023 Q3.


There were a number of things that jumped out in this analysis – including a significant 5-minute ramp in AggSchedTarget (+960MW from 13:35 to 13:40) on Friday 8th September 2023.  This is shown in the following view for the day:


I’ve posted this as a ‘Part 1’ of a (somewhat cryptic) Case Study that we might have time to extend on later (e.g. as a ‘Part 2’ in a series, and so on).


Some (very brief) context

For now, I just wanted to add in three ez2view snapshots, Time-Travelled back to 13:30, 13:35 and 13:40 on the day of interest.  Remember that when Time-Travelled the DUID-related output data reverts to ‘Final MW’ to align with prices:

Friday 8th September at 13:30

Here’s a view of some  of what was happening in the market for the 13:30 dispatch interval (i.e. 5 minutes before the ramp in AggSchedTarget starts):


One thing that particularly jumped out to me in this series is the significant drop in aggregate output from Large Solar in NSW over a 10 minute period.

… I’ve not investigated any further, but this might be a one part of the reason why fully Scheduled units were asked to dispatch more.

Aggregate Large Solar output in NSW = 1,748MW (metered at ~13:30).

Friday 8th September at 13:35

Stepping forward to the 13:35 dispatch interval we see the following:


NSW region price has dropped $7/MWh, and is barely positive.

Aggregate Large Solar output in NSW = 1,582MW (i.e. down 166MW).

Friday 8th September at 13:40

Stepping further forward, to the 13:40 dispatch interval:


NSW region price has dropped, just below $0/MWh.

Aggregate Large Solar output in NSW = 1,443MW (i.e. down another 139MW).


That’s all for now….

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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