Frequency wobbles on Tuesday 17th June 2025
A quick look at two particular instances of (relatively small) frequency disruption on Tuesday 17th June 2025.
frequency disruption
A collation of articles pertaining to some larger disruptions in system frequency (such as outside of the Normal Operating Frequency Band – NOFB).
Which units show large positive Dispatch Error for 15:40 on Monday 16th June 2025
Following on from Linton's article (about the frequency drop at 15:40 on Monday 16th June 2025) we take a look at the largest harmful Dispatch Errors across the full fleet of units ... and...
Drop in mainland frequency on 16 June 2025
In reviewing system frequency on the 16th of June, 2025, we observed a drop that reached below the NOFB.
Sharp drop in frequency on Friday morning 13th June 2025, with trip at Newport Power Station
I’ve not yet had time to fully investigate, but thought it worth recording the sharp drop in frequency that appears to have occurred shortly after 07:30 NEM time on Friday 13th June 2025.
A quick look at system frequency, with 2 x coal units offline overnight into Saturday 31st May 2025
It’s fitting to book-end the week with a look at frequency performance overnight (into Saturday 31st May 2025) with two coal unit outages in NSW overnight to see what happened in terms of more...
Poor dispatch performance of VRE (collectively) on Monday 26th May 2025 sufficiently large to drive frequency outside of NOFB
Prior to the Brisbane session of the Nelson Review Panel (on Thu 29th May 2025) we take a look at Dispatch Error in the 16:15 dispatch interval on Monday 26th May 2025 to see...
Drop in mainland system frequency on 26 May 2025
The measurements indicated frequency ducked just below the NOFB briefly, reaching 49.843 Hz.
Loy Yang A3 offline on Tuesday afternoon 20th May 2025 – small frequency drop
A short note because of a 295MW drop in output from Loy Yang A3 just prior to 14:06 (NEM time) on Tuesday 20th May 2025.
Drop in NEM Mainland Frequency appearing to coincide with trips at New England Solar Farm, on Saturday 19th April 2025
We take a quick look, after AEMO noted that at 13:51 (NEM time) the New England Solar Farm No.1 and No.2 both tripped.
Mainland system frequency on April 10, 2025, associated with VIC transmission outage
High speed frequency measurements provide a deeper understanding of how the system responded to the unplanned 500kV line outage.
582MW (instantaneous?) drop in ‘Market Demand’ in Victoria delivers large System Frequency spike – Thursday 10th April 2025
Noting a large 582MW drop in ‘Market Demand’ in Victoria this morning (Thu 10th April 2025) – as captured in this ‘Notification’ alert in ez2view at 08:31 (NEM time).
Frequency drop with trip of Callide C3 on Friday 4th April 2025
A quick record of unit trip at CPP3, and associated frequency drop, on Friday 4th April 2025.
Frequency excursion on Monday 31st March 2025
A very short article to note an apparent mainland frequency excursion (just prior to 17:00 NEM time on Monday 31st March 2025).
Afternoon trip of Bayswater unit 3 delivers rapid drop in Mainland Frequency
A quick record of a unit trip at Bayswater Power Station on Wednesday afternoon 5th March 2025.
A closer look at NEM Mainland Frequency (at 100ms cadence) on Thursday afternoon 13th February 2025 (i.e. Part 2)
Some recent questions prompted this more granular look at NEM Mainland Frequency on Thursday afternoon 13th February 2025
Last Friday’s large and (mysterious) apparent drop in NSW ‘Market Demand’ (part 3) … what helped restrain frequency?
Friday 31st January 2025 (appeared to) experienced a very large drop in demand in NSW in a single dispatch interval - but we're now suspecting some form of data/operational glitch. However we wonder, if...
(Mysterious and) Large drop in NSW ‘Market Demand’ late afternoon Friday 31st January 2025, prompting questions … part 1
Coincident with the walk home this afternoon/evening, the ‘Notifications’ widget in one of our display copies of ez2view alerted us to a large drop of ‘Market Demand’ in the NSW region … at a...
Frequency drop coincident with trip of Callide C3 unit, on Wednesday morning 20th November 2024
A short note to flag the apparent trip of Callide C3 just prior to 06:35 (NEM time) on Wednesday 20th November 2024.
Drop in mainland frequency on Wednesday afternoon 13th November 2024
A short article on Wednesday afternoon, 13th November 2024 with this snapshot highlighting a drop in frequency on the mainland.
*later* drops in NEM Mainland Frequency on Tuesday 12th November 2024
We’ve already looked at how there was a drop in system frequency at ~10:41 NEM time (outside of the NOFB) in conjunction with trips of units at Yallourn Power Station. Well, believe it or...