Yesterday afternoon, we quickly noted the ‘Frequency drop on Friday afternoon 31st October 2025’.
Still sitting waiting for my flight back from All Energy 2025, I’ve extracted some data and present the following:
Briefly:
1) Note that one of our frequency monitors appears not to be recording (after-effects of the recent storms and power outage in Brisbane),:
(a) so have defaulted back to ‘Device 1’,
(b) which in recent times we observe has suffered from some (power quality related?) noise issues that occasionally crop up.
2) I’ve highlighted the time range of interest on Friday afternoon 31st October 2025:
(a) The decline of interest begins at ~13:46 (NEM time) … which is i.e. 9 minutes before the lowest point
(b) With the lowest point being at 49.841Hz at 13:55:28.1
… which is outside of the Normal Operating Frequency Band.
(c) With recovery beginning from that point, but ‘complete’ at ~14:10 (i.e. by 15 minutes afterwards)
(d) So, altogether, lasting 5 x 5-minute Dispatch Intervals.
So this will enable us to look in more detail in a subsequent article.
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