System frequency at 11 am in 2026, September update
The strongest alignment for a free power window-start is when Qld, Vic and NSW all start at 11am, between April and October.
The strongest alignment for a free power window-start is when Qld, Vic and NSW all start at 11am, between April and October.
On Tuesday 25 August SA Power Networks had planned to conduct its annual test of its ability to temporarily curtail rooftop solar generation.
Supply fluctuated but was this to an equivalent extent as the recorded interconnector flows would suggest, or the noted demand change in NSW for the 16:25 interval?
The nadir we measured was shortly after 16:25: 49.825 Hz, at 16:25:33.
A sudden drop in NSW demand was followed by apparent recovery in the next interval.
By June the dip in frequency just after 11 am is clear.
The greatest difference, pre and post July 2025, is in the flows from Victoria to Tasmania.
The trend for declining skill as outlook increases is fairly linear. Encouragingly, outlooks at the 6-day mark still have better skill than random.
Uncertainty fluctuates considerably in the 6-day ahead forecasts. Some locations, appear to be generally more predictable than others, Queensland sites in particular.
A number of readers have asked about the recent increase in market notices for Manifestly Incorrect Inputs (MII).
We use a chart to see how semi-scheduled unit availabilities changed their origin. With interruptions to SCADA across NSW, many of the inputs that an availability forecast depends on could have been impacted.
One feature of a market suspension is the possibility for suspension pricing, which happened in this case. Did it influence energy offers?
Energy storage levels of NSW grid scale batteries are analysed for behaviour on 23 March 2026.
Following our observations of "Riding the yo-yo, during NSW market suspension" we inspect system frequency during the day.
With a market suspension notice issued for a failure of SCADA systems, we inspect whether unit MW readings are impacted.
The AER has determined the revenue that Basslink can recover for the Basslink transmission cable for the 2026-30 period, operating as a regulated service.
We find the trend for increasing enablement of the 'new' resources has only continued, that the new FCAS resources are the dominant providers of all FCAS services nowadays.
"And what happened to system frequency?" Our initial inspection indicates there was a very minor impact.
On Tuesday 2nd February we observed the trip of both Vales Point units. Ez2view supports understanding of the event and return to service.
Top 10 units with deviations in support of, and in opposition to, the frequency need around the trip of Callide C units 3 and 4.