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.
frequency disruption
A collation of articles pertaining to some larger disruptions in system frequency (such as outside of the Normal Operating Frequency Band – NOFB).
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...
A closer (though still cursory) look at NEM Mainland Frequency in a data extract on Tuesday 12th November 2024
A second quick look at the drop in NEM Mainland Frequency on Tuesday 12th November 2024.
NEM Mainland Frequency drops below the NOFB, on Tuesday 12th November 2024
A quick article recording the drop of NEM Mainland Frequency below the lower bound of the NOFB on Tuesday morning 12th November 2024.
A view of the extracted Mainland Frequency trace on Thursday afternoon 7th November 2024 (Part 2)
Yesterday, amongst the volatility, we also wrote about a ‘Small (NEM Mainland) frequency wobble, on Thursday afternoon 7th November 2024’. As a stepping stone to further analysis, we extracted data from around that time...
Small (NEM Mainland) frequency wobble, on Thursday afternoon 7th November 2024
Perhaps contributing to the early start to price volatility in NSW this afternoon was the wobble in system frequency shown here?
Mainland frequency wobbles, on Wednesday 6th November 2024
A very short article for Wednesday 6th November 2024, such that we might follow up later, to note the following two wobbles in frequency in the mainland NEM today
~55 minutes of frequency wobbles in the middle of the day – Thursday 31st October 2024 (Part 1)
Some wobbles in System Frequency (NEM mainland) through the middle of the day on Thursday 31st October 2024 stick out, and will be progressively explored.
Some rapid fluctuations in NEM Mainland Frequency – on Tuesday afternoon/evening 29th October 2024
A short article to flag a two rapid (and noticeable) fluctuations in Mainland Frequency that we spotted this afternoon/evening on Tuesday 29th October 2024.
Drop in NEM mainland frequency on Friday 18th October 2024 following trip of Loy Yang A2
Another 'interesting' event today ... a dip in mainland frequency with trip of Loy Yang A2.
Also some gyrations in NEM Mainland Frequency, on Thursday 17th October 2024.
To provide some more colour about what’s been happening on Thursday 17th October 2024, here’s a snapshot of NEM Mainland frequency at 15:07 (NEM time) looking back only 15 minutes.