We noted just before about the ‘582MW (instantaneous?) drop in ‘Market Demand’ in Victoria delivers large System Frequency spike’ this morning (Thu 10th April 2025).
Coincidentally, the AEMO has followed with MN126464 at 08:49 that helps to explain why:
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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 10/04/2025 08:49:30
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Notice ID : 126464
Notice Type ID : INTER-REGIONAL TRANSFER
Notice Type Description : Inter-Regional Transfer limit variation
Issue Date : 10/04/2025
External Reference : Inter-regional transfer limit variation – APD – Heywood – Mortlake 500 kV line – VIC region – 10/04/2025
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Reason :
AEMO ELECTRICITY MARKET NOTICE
Inter-regional transfer limit variation – APD – Heywood – Mortlake 500 kV line – VIC region – 10/04/2025
At 0825 hrs 10/04/2025 there was an unplanned outage of the APD – Heywood – Mortlake 500 kV line.
The following constraint set(s) invoked at 0835 hrs 10/04/2025
V-HYMO
This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA,T-V-MNSP1,V-S-MNSP1,VIC1-NSW1,NSW1-QLD1
Refer to the AEMO Network Outage Scheduler for further information.
Manager NEM Real Time Operations
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END OF REPORT
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… a trip of the Portland aluminium smelter was top of the list of guesses of what might have contributed to the drop in demand.
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