AER releases Issues Paper on proposed rule change(s) for Semi-Scheduled generators

On Wednesday 24th June the AER published this ’Issues Paper: Semi scheduled generator rule change(s)‘ to commence some consideration of potential changes relating to the way in which Semi-Scheduled generators participate in the dispatch process (e.g. bid, and follow dispatch targets):


For our future reference, this ‘Initiation’ page on the AER website provides a summary.

It’s seemed to me for some time that the way the process currently works for semi-scheduled generators is neither scalable, nor sustainable over time – hence had been expecting some moves to be made to evolve the arrangements into something more sustainable and scalable.

At this time:

1)  That I have not had a chance, yet, to review what the AER has compiled; but

2)  Understand that some of the concerns raised by the AER relate to behaviour such as that explored here at Lake Bonney 2 Wind Farm back on 24th July 2018 (article posted 21 months ago now) and explored statistically in more detail as part of a broader application of the ‘Raw off-Target’ metric in the Generator Statistical Digest 2019; and

3)  Note that there is a forum via WebEx being organised for this Thursday 2nd July which promises to be quite interesting.

4)  Furthermore, submissions due by COB on Wednesday 22nd July.

5)  Which I presume will lead into some rule change considerations at the AEMC.


… hence I anticipate we’ll be sharing more thoughts in the coming weeks via WattClarity.

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.

16 Trackbacks & Pingbacks

  1. ‘Too Low for Zero’ as a parable for the AER Issues Paper? – WattClarity
  2. Striving to understand the underlying challenges with Semi-Scheduled generators (re AER Issues Paper) – WattClarity
  3. Case Study of 03:25 on Tuesday 5th April 2016 (aggregate Raw Off-Target +359MW for Semi-Scheduled units) – WattClarity
  4. Case Study of 16:20 on 28th September 2016 (aggregate Raw Off-Target +894MW for Semi-Scheduled units) – WattClarity
  5. Case Study of 03:45 on Monday 15th October 2018 (aggregate Raw Off-Target +308MW for Semi-Scheduled units) – WattClarity
  6. Some late winter mainland volatility – Monday evening, 24th August 2020 – WattClarity
  7. Victorian Scheduled Demand plunges in the middle of the day, Saturday 29th August 2020 (a new daytime record low?) – WattClarity
  8. Case Study of two DIs on Monday 25th March 2019 (large collective under-performance across Semi-Scheduled units) – WattClarity
  9. AER releases proposed rule change for Semi-Scheduled generators and dispatch instructions – WattClarity
  10. Case Study of 16:55 on Monday 8th April 2019 (aggregate Raw Off-Target +318MW for Semi-Scheduled units) – WattClarity
  11. Case Study Part 4 – Who did What – in QLD on Tuesday 13th October 2020? – WattClarity
  12. AEMC proceeds to fast-track consideration of the AER’s semi-scheduled generator dispatch obligations rule change – WattClarity
  13. AEMC publishes draft rule change for Semi-Scheduled generators – WattClarity
  14. A quick look at the generator bids across Sunday 23rd August 2021 (when Solar temporarily eclipsed Coal) – WattClarity
  15. Observation 13/22 from GenInsights21 – is the Semi-Scheduled category sustainable or scalable? - WattClarity
  16. AEMC publishes Rule Determination on Semi-Scheduled Generators - WattClarity

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