Worth a short note to copy in MN128971 from the AEMO published at 13:03 today (Friday 5th September 2025) as follows:
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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/09/2025 13:03:23
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Notice ID : 128971
Notice Type ID : CONSTRAINTS
Notice Type Description : New/Modified Constraints
Issue Date : 05/09/2025
External Reference : New Victorian system normal constraint to manage contingency size on north-west Victoria generations
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Reason :
AEMO ELECTRICITY MARKET NOTICE
AEMO Victorian Planning has conducted studies and have found that the 220kV Generator Fast Trip scheme (GFT1) and inherent tripping of Waubra Wind Farm (Waubra WF) in north-west Victoria, have the potential to create a single contingency size of greater than 600MW and up to a maximum of 1000MW.
AEMO assess and manage contingency sizes carefully as larger contingency sizes could have significant impacts on power system security. To ensure ongoing power system security, AEMO will apply a new constraint equation to limit the total MW output from generators included in the GFT1 scheme.
The new constraint equation will limit the total generation output for generators associated with the GFT1 scheme (and inherent tripping of Waubra WF) to a limit of 750MW.
The following new constraint equation will be implemented and added to constraint set V-NIL at 1000 hrs on Tuesday 9th September 2025:
V_NWVIC_GFT1_750
For full details on the factors this constraint equation has now been loaded into AEMO’s pre-production systems.
For further details on this constraint equation please contact AEMO Victorian Planning.
Terry Liu
AEMO Operations
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END OF REPORT
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We’ll wait to see how often the new ‘V_NWVIC_GFT1_750’ constraint equation binds.
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