Large drop in ‘Market Demand’ in South Australia on Thursday 20th November 2025
A quick note on Thursday evening 20th November 2025 to record this large size (214MW) drop in ‘Market Demand’ in the 17:50 dispatch interval NEM time this evening.
Market Operations
A case study into reserve uncertainty during peak demand events in the NEM
A summary of a recent academic case study looking into the events of January 22, 2024 in the QLD region, revealing how DER dynamics, weather variability and forecast limitations are amplifying operational challenges.
Early afternoon volatility in NSW on Thursday 20th November 2025
We’re busy focused on other things at present, so just a NEMwatch snapshot at 13:25 (NEM time) on Thursday 20th November 2025 to mark some volatility in the NSW region.
AEMO issues Market Notice ‘Update to Negative Settlement Residue constraint equations’
On Wednesday 19th November 2025, the AEMO issued MN130792 at 15:36 about "Update to Negative Settlement Residue constraint equations"
How high did frequency get, on Tuesday 11th November 2025, when that gremlin re-appeared?
Extracted our high(er) speed readings highlights that the mainland frequency exceeded the NOFB for a period of the morning on Tuesday 11th November 2025.
The bottom falls out of SA ‘Market Demand’ unexpectedly, on Tuesday 18th November 2025
A brief record of some challenges encountered in forecasting midday Market Demand for South Australia on Tuesday 18th November 2025.
Drops in mainland frequency on Saturday afternoon 15th November 2025
I’m not sure if related to the severe weather warnings for both QLD and NSW today, but here’s a quick record of some afternoon weakness in frequency control on Saturday 15th November 2025.
(A first?) Severe Weather alert for the Queensland (and now NSW) Region … Saturday 15th November 2025
Relatively early in the afternoon (Saturday 15th November 2025) I received simultaneous alerts from the BOM and from AEMO about 'severe weather' in relation to Queensland this afternoon.
Expected RTS for Yallourn 2 slips a month – now offline until 24th January 2026
On Friday 14th November 2025, the expected return to service for YWPS2 was pushed back another ~6 weeks (now offline till Monday 24th January 2026).
AEMO frequency monitoring report provides some details of frequency event (due to self-forecast glitch) on 19th August 2025
Adding to the list of articles we've collated about the frequency disturbance on Tuesday 19th August 2025, we're copying in what AEMO published in its 2025 Q3 monitoring report about the glitch.
Trying to understand the errors in ‘Initial Supply’ (on Tue 11th and Thu 6th November) as the source of the gremlins
In this article we take another step in trying to understand the source of the gremlins (on Thu 6th Nov 2025 and Tue 11th Nov 2025) that seemed to infect the dispatch process -...
How often have we seen these gremlins, injecting ‘phantom’ demand and driving frequency high? … a 1st pass
Following two instances of apparent data glitches (injecting 'phantom demand' and) driving frequency high, here's a collation of some other times (we've written about) where similar has happened.
AEMO (and the BOM) warning about possible ‘Severe Space Weather’ (at G4, possible G5) in next ~24 hours
One WattClarity reader has pointed us to AEMO and BOM warnings about space weather - noting that 'G4 geomagnetic storm conditions are currently being observed. G4 with a chance for G5 is expected on...
AEMO directs again in South Australia for Minimum System Load – Wednesday 12th November 2025 (second day in a row)
For the second day in a row, AEMO has issued direction (to Torrens Island BESS) due to concerns about Minimum System Load in South Australia - with today's on Wednesday 12th November 2025.
More, about noisy MSL warnings for South Australia … and an Actual MSL2 and AEMO Direction on Tuesday 11th November 2025
Second article about forecast (and actual) Minimum System Load conditions in South Australia ... and Directions as a result (on Tuesday 11th November 2025).
Kogan Creek trips (on Tuesday morning 11th November 2025) … and ironically helps frequency
Three quick notes, after seeing the trip of Kogan Creek on Tuesday morning 11th November 2025.
Has it happened again … have gremlins invaded NEMDE and triggered a frequency excursion (Tuesday 11th November 2025)?
In what seems to be a repeat of what happened last week Thursday 6th November 2025, some strange (and large) changes in 'Market Demand in Victoria appear to have driven a frequency excursion on...
Angela’s article in AFR answers some of our "What’s up with Waratah BESS?" question
On Friday afternoon we asked the question ‘What’s up with Waratah BESS (unplanned outage till 3rd May 2026)?’. It was great to see (on Monday evening) Angela MacDonald-Smith answer some of these questions in...
Sunday evening trip at Callide C4, and wobbles coming back online
Taking a quick look - after our ez2view ‘Notification’ widget triggered an alert for what appears to be Callide C4 tripping from close to full load (Sunday 9th November 2025 at 21:26 NEM time)
A quick look at (plant-related) rebids for Waratah BESS from 19th October to 8th November 2025 (with PASA Avail 350MW)
Another in the series about Waratah BESS, we have a look at the unit's bids and operations over a 20-day time-range to midnight ending Saturday 8th November 2025.