Following Paul’s capture of the Significant drop in Mainland Frequency (Wed 5th Aug 2026) around the time of what appeared to be “just” a Data Glitch we inspect the series of mainland frequency further.
The chart is frequency measured every 0.1 seconds, in Brisbane, by Global-Roam.
So, we can see the decline started near the start of the 16:25 interval (at 16:20). The decline was steady over the 16:25 interval.
At 16:20 we measured 49.964 Hz. At 16:25 we measured 49.835 Hz. A decline of -0.129 Hz over the 5-minute interval.
The nadir we measured was shortly after 16:25: 49.825 Hz, at 16:25:33.
Frequency recovered in the 16:30 interval, by the end of that it had reached 49.954 Hz. And in the 16:35 and 16:40 intervals it rose further towards 50 Hz and the PFR deadband range (+/- 0.015 Hz).
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