At 16:01 on April 10, 2025, a system frequency dip was observed from the Global-Roam frequency logger which records at 100 millisecond intervals.
In this article we present three charts using the frequency data to provide an initial point of reference for any future analysis that, time permitting, we may perform.
Frequency dipped to 49.824 Hz and spent some time near the lower NOFB
Zooming in we observe some variability in the measurements between 16:01:15 and 16:01:23
The decline happened over relatively long period leading to only moderate rates of change
Linton is a Senior Software Engineer and Market Analyst, who joined Global-Roam in August 2020.
Before joining the company, Linton worked at the Australian Energy Market Operator (AEMO) for seven years, including four years as an analyst within their demand forecasting team. Before entering the energy sector, he worked as an air quality scientist in the Czech Republic.
A follow-on to my earlier article of a couple weeks ago, looking at another instance where a team effort was required to counter a drop in system frequency following the loss of generation at a large power station (this time the single unit Kogan Creek power station – the largest single unit in the NEM).
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.
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