Mainland frequency trends lower for a few minutes on late Sunday afternoon 6th October 2024.

The drop in system frequency yesterday (Saturday 5th October) discussed here earlier was at approximately 15:45.

Using the same real time, (relatively) high speed monitoring, we see the following late this afternoon, Sunday 6th October 2024:

Note that the low point here:

1)  Was at about the same depth as seen for yesterday;

2)  But occurred ~100 minutes later than was the case for Saturday 5th October 2024.

I wonder what the cause of this might be … is this related to the waning of rooftop PV into the late afternoon, and AEMO’s difficulty of forecasting this precisely?  Or something else entirely?