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.
Operational Glitches
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.
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...
A quick look at ‘Dispatch Error’ on Thursday 6th November 2025, in conjunction with the Frequency Spike
Today, we have the advantage of ‘next day public’ data, so are able to peel some more layers of the onion (in this article 'Dispatch Error') - with respect to the significant Frequency Spike...
A quick look at some of the market dynamics around the NEM during this afternoon’s frequency episode
This afternoon we saw mainland frequency briefly step above its normal operating band for approximately 20 minutes — potentially the result of a data glitch. In this quick piece, we unpack some market dynamics...
Specifics of the frequency excursion (well outside the NOFB) on Thursday 6th November 2025
In the first hasty article about today's (Thu 6th Nov 2025) frequency spike, we see it quickly went past the NOFB. So, in this article, we look at how far ...
Was that a data glitch that saw lunchtime ‘Market Demand’ ramp in Victoria by 1,812MW?
Given the large ramp in frequency around midday Thu 6th Nov 2025, coincident with a large apparent ramp in 'Market Demand' in Victoria, we suspect a data glitch.
Major spike in mainland frequency, on Thursday 6th November 2025
A short note with this snapshot from our live frequency reading over the past hour showing a spike well outside of the Normal Operating Frequency Band on Thursday 6th November 2025
High level view of some contributing factors to 19 August frequency spike
Among other aspects, a large dip in solar UIGF aligns with the frequency deviation observed on 19th August 2025.
Mainland Frequency Spikes to 50.2 on Tue 19th August 2025
On Tuesday the 19th of August between 11:45 and 12:20 there was a significant frequency deviation on the mainland.
Gremlins in the EMMS upgrade to Data Model v5.5, making ‘the Resurrection of Old Coal’ appear on the cards
On Tuesday 29th April 2024 we noted a glitch in some ez2view widgets stemming from changes in the EMMS triggered by the upgrade process for Data Model v5.5.
AWEFS and ASEFS dispatch availability forecast outage on 11 March, 2025
AWEFS and ASEFS dispatch availability forecast systems experienced what looks to be an outage and we uncover how the 'SCADA' origin filled the gap.
Gremlins in AEMO systems publish rogue APC alert for South Australia, Sunday 9th March 2025
Which much attention focused on Queensland (in the wash out that has been TC Albert) a rogue Administered Pricing Notice (MN125439) for South Australia was a head scratcher, on Sunday 9th March 2025.
Whiplash abated … market oscillations stopped on Wednesday afternoon 12th February 2025
Following an earlier article (on Wednesday morning 12th February 2024) we note the end of oscillations related to the newly composed ‘N-BU_330_TX_ONE’ constraint set for an outage related to Project Energy Connect.
Whiplash from yo-yo-ing prices (and hence targets etc) on Wednesday morning 12th February 2025
Wednesday morning 12th February 2024 sees rapid and large oscillations in prices across all regions - which results from (and/or leads to) oscillations in output of many units. One of the contributing factors is...
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...
Last Friday’s large and (mysterious) apparent drop in NSW ‘Market Demand’ appears some data glitch?
Taking a second look at the (apparent) large drop in NSW 'Market Demand' on Friday afternoon 31st January 2025. Was it a data glitch instead?