I’ve taken the opportunity of a quiet space to extract some data over a 4-hour time range (and at 0.1 second cadence) to compile the following trend:
Unfortunately:
our ‘Device 2’ location was temporarily offline (following some power outages following Brisbane storms at the time)
so we had to revert back to the new ‘Device 1’ location … which (as noted on the image) we have observed appears to suffer from occasional noise (perhaps related to local intermittent power quality issues?).
So in the chart above we can’t really trust the specific details of the depth of the frequency drop, other than to note that the low point will have been around ~17:01 (NEM time) on Thursday 30th October 2025.
That should be enough for us to explore in a bit more detail….
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
As the 5th article in an evolving series that progressively explores the (apparent self-forecasting glitch and) frequency spike on Tuesday 19th August 2025, we take an early look at Solar Farm performance.
We follow on from A 292MW drop in “Market Demand” in Tasmania, on Saturday 16th August 2025 enlisting this “Part 2” to understand the sequence of events using 4-second data.
Here’s the raw hz data from Melbourne. 49.84hz is the lowest I saw
https://www.dropbox.com/scl/fi/x1t4c6wku2fw6dt21c2m0/hz-data.csv?rlkey=vz5w7ppo8m8umf1md09jrelxw&dl=0 (note it also has noise but