Initial review of unit output on Wednesday 5th August 2026
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?
Articles by Linton Corbet
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.
Mainland Frequency Wednesday 5th August 2026, how low and when
The nadir we measured was shortly after 16:25: 49.825 Hz, at 16:25:33.
Major change in NSW ‘Market Demand’ on Wed 5th August 2026 – ‘just’ a data glitch, or more?
A sudden drop in NSW demand was followed by apparent recovery in the next interval.
System frequency at 11 am in 2026
By June the dip in frequency just after 11 am is clear.
Basslink on track to operate as regulated interconnector from 1 July 2026
The greatest difference, pre and post July 2025, is in the flows from Victoria to Tasmania.
A further look at wind forecasts in the ST PASA timeframe
The trend for declining skill as outlook increases is fairly linear. Encouragingly, outlooks at the 6-day mark still have better skill than random.
An initial look at 6-day ahead Wind Uncertainty
Uncertainty fluctuates considerably in the 6-day ahead forecasts. Some locations, appear to be generally more predictable than others, Queensland sites in particular.
Daily count of MII market notices confirms sudden increase
A number of readers have asked about the recent increase in market notices for Manifestly Incorrect Inputs (MII).
Mixed sources of semi-scheduled availability on March 23, 2026
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.
Managing bids during the market suspension on 23 March 2026
One feature of a market suspension is the possibility for suspension pricing, which happened in this case. Did it influence energy offers?
Initial energy storage involved in issues
Energy storage levels of NSW grid scale batteries are analysed for behaviour on 23 March 2026.
System frequency while NSW demand yo-yos
Following our observations of "Riding the yo-yo, during NSW market suspension" we inspect system frequency during the day.
Where might a failure of SCADA systems show up in the MMS
With a market suspension notice issued for a failure of SCADA systems, we inspect whether unit MW readings are impacted.
Basslink gets final revenue determination for operation as a regulated service
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.
New FCAS resources dominate enabled levels in 2025
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.
Vales Point impact on frequency appears well mitigated on 2nd February 2026
"And what happened to system frequency?" Our initial inspection indicates there was a very minor impact.
Vales Point units trip on Monday 2nd February 2026
On Tuesday 2nd February we observed the trip of both Vales Point units. Ez2view supports understanding of the event and return to service.
Helpful and unhelpful MW deviations on 15th January 2025
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.
Charting the 4-second data following trip of Callide C3 and C4
The trip coincided with the drop in frequency, which happened at the start of the dispatch interval.
Actual lack of reserve level 2 on Friday 19th December 2025 in NSW
The minimum reserve available is projected to be 664 MW between 16:00 and 17:00.