Perhaps some early changes with Bid Strategy, with Five Minute Settlement

We release ez2view v9.1 for Five Minute Settlement a couple weeks ago and are now progressing with the development of what will be a v9.3 release (soon) for the Wholesale Demand Response Mechanism … taking into account Tripwire #3.


(A)  Quick analysis

In playing with the current (i.e another new one – v9.2.1.23) interim build I thought I’d have a quick look at two ‘before’ and ‘after’ cases, to see if there are easily visible changes in bidding patterns under this new pricing regime…

(A1)  Bids aggregated for QLD coal generators

Here’s a snapshot from ez2view of the ‘Bids & Offers’ widget spanning the past 30 days, and filtered down just to Queensland coal generators:


Remembering that there are four broad colours used in the ‘bid ranges’ and starting from bottom to top:

1)  The BLACK (or sometimes GREY) colours denote ‘Fixed Load’ bids … and I can’t see why there would be any changes in these

2)  Looking at the BLUE bid ranges (i.e. volume bid at $0/MWh at the RRN … all the way down to the Market Price Floor of –$1,000/MWh) it is difficult to see any real difference in this helicopter aggregated view.

Remember how Allan previously explained ‘how do contracts affect bidding behaviour?’ … in other words, some reasons why coal generators might bid volumes down at -$1,000/MWh.

3)  The GREEN range is quite small (as discussed previously in the GRC2018 in terms of ‘Risk is Escalating’ … which is something we have explored further in GenInsights21).  But it’s difficult to see any macro changes jumping out at this helicopter level.

4)  In terms of the PINK and RED range (i.e. volume bid above the $300/MWh cap payout price) we do see that the reduction in volume bid in the pink range (i.e. $300.01/MWh to $500/MWh).

However whether this is due to the change to Five Minute Settlement, or whether due to other factors (e.g. it’s a new quarter, and hedge cover sold by the generators will probably have changed) can’t be ascertained.

In the pink line overlay we can also see how the QLD dispatch price has trended over the period – hence we can see the couple price spikes that have occurred over the period (including the spike on on Thursday 30th September and the spike on 1st October).  The helicopter view is too ‘zoomed out’ to really perceive any real change in response to these price spikes.

(A2)  Bids aggregated for VIC wind and solar generators

Preparing a more complex ‘Power Filter’ to aggregate together bids for only Wind and Solar (i.e. Semi-Scheduled) plant in Victoria, we see this trend over the same 30-day history:


In this chart I have highlighted how it appears that a higher volume of energy-constrained volume from these Wind and Solar plant was offered to the market above the MPF of –$1,000/MWh … though still below $0/MWh.  It seems logical that this has been a natural response to the move to Five Minute Settlement.

We’ll watch with interest to see what continues to unfold…


(B)  Deeper Analysis to come…

I noted on Monday how a deeper analysis will be prepared and included in GenInsights21 as an ‘Early insights from the operation of Five Minute Settlement’ appendix.  Those able to attend the Australian Institute of Energy event being organised for Thursday 2nd December 2021 will also be able to discuss some of those insights with me.

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.

2 Comments on "Perhaps some early changes with Bid Strategy, with Five Minute Settlement"

  1. Didn’t notice the power filter function! By the way, using all volumes, effective as-bid availability showed the change in bid stack from solar and wind plants in a clear way too.

    • Nice that this article helped you discover that one, Adrian. Remember the individualised ‘Widget Guide’ accessible under the ‘?’ button in the top right of the widget might provide other ideas for how to use that widget!

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