Administered Pricing for FCAS services in South Australia ended on Sunday 24th August 2025 … so what’s next?

Yesterday morning (Sunday 24th August 2025) the AEMO published MN xxx as follows:

‘——————————————————————-
MARKET NOTICE
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From :              AEMO
To   :              NEMITWEB1
Creation Date :     24/08/2025     03:55:01

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Notice ID               :         128654
Notice Type ID          :         ADMINISTERED PRICE CAP
Notice Type Description :         Administered price periods declared.
Issue Date              :         24/08/2025
External Reference      :         [EventId:210] AP ENDED for market ancillary services in SA1 at 24 August 2025 03:55

——————————————————————-

Reason :

AEMO ELECTRICITY MARKET NOTICE

Issued by Australian Energy Market Operator Ltd at 0355 hrs on 23 August 2025

ADMINISTERED PRICE PERIOD ENDS in SA1 region.

In accordance with Clause 3.14.2(b) of the National Electricity Rules, AEMO is notifying market participants that the administered price period declared for the SA1 region in market notice 128647 will end at 0400 hrs on 24 August 2025.

This is an AEMO autogenerated Market Notice.

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END OF REPORT
——————————————————————-’

… but, unlike the previous 6 days, did not automatically follow this with one noting Administered Pricing for the FCAS services in South Australia would continue.

So it’s worth revisiting this ‘Trends Engine’ chart from ez2view, now expanded back to include June 2025 to show the trend of the Lower 1 second FCAS Price in South Australia and the accompanying Cumulative Price:

Remember that it was a particular network outage in South Australia (on the Tailem Bend – Tungkillo 275kV line) that was the driver of Lower 1 Second FCAS (i.e. a FFR service) needing to be be procured locally (amongst others), leading to sky-high prices and the Cumulative Price Threshold being breached.

So it’s worth a look ahead via the ‘Constraint Sets’ widget in ez2view to see when the ‘S-TBTU’ constraint set (which reflects this outage) might return:

As we can see here:

1)  Plenty of other outage-related constraint sets in the Gantt Chart

2)  With respect to the ‘S-TBTU’ constraint set, the next instance of this outage looks set to be next Tuesday 2nd September 2025.