AEMO declares ‘Scheduling Error’ in relation to glitches on Friday 10th April and Saturday 11th April 2026

Posted by Paul McArdleThursday 4th June 2026  6:07 PM   Topic: 2026-04-10, 2026-04-10 Frequency Spike with Glitch in UIGF Forecasting, 2026-04-11, 2026-04-11 Frequency Spike with Glitch in UIGF Forecasting, 2026-05-29

We’ve already written a number of articles with respect to sequential day operational glitches in April 2026:

 

In particular, note ‘A big clue to one causal factor in both frequency spikes (on Friday 10th April 2026 and Saturday 11th April 2026)’:

2026-04-14-WattClarity-CausalFactor

 

… and then ‘One image to summarise the sequence of events in the Frequency Spikes of Fri 10th and Sat 11th April 2026’:

2026-04-26-WattClarity-SequenceOfEvents

 

So it was not really a surprise (though it’s nice to know) that last Friday 29th May 2026 the AEMO declared both Scheduling Errors (together anointed number 77), with the following description provided:

‘At 10:30 hrs on 10/4/2026, AEMOs Variable Renewable Energy Forecasting System (VREFS) incorrectly produced a 0 MW forecast for multiple semi-scheduled wind farms in Victoria and South Australia. This resulted in these units generating well above dispatch targets of 0 MW, with no semi‑dispatch caps applied. Non-conformance constraints were invoked for Elaine WF, Golden Plains WF East 1, Golden Plains WF East 2, Ryan corner WF.

A similar event occurred at 14:20 hrs on 11/4/2026, VREFS again incorrectly produced a 0 MW forecast for multiple semi-scheduled units.  This led to generation exceeding dispatch targets without the application of semi-dispatch caps.’

 

A big thanks to the WattClarity reader who alerted us to this!

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About the Author

Paul McArdle
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.

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