Here’s a subset of articles pertaining to events of Tuesday 19th August 2025.
On this day …
1) There was a large frequency spike across the NEM that was caused by a data glitch at one particular vendor of self-forecasts:
(a) In this category we have collated a couple of articles about the glitch;
(b) But note that there are more articles here about the large frequency spike across the NEM
i. lasting ~25 minutes
ii. and above the upper bound of the Normal Operating Frequency Band in the middle of the day.
2) However note that there’s more articles that are more broadly focused 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.
Among other aspects, a large dip in solar UIGF aligns with the frequency deviation observed on 19th August 2025.
On Tuesday the 19th of August between 11:45 and 12:20 there was a significant frequency deviation on the mainland.