‘N-MNYS_5_WG_CLOSE’ constraint set invoked, because of unplanned outage of Yass – Marulan 5 330kV line

A quick article to copy in MN131552 because it might become relevant over the next 4 days:

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 10/12/2025 16:32:23

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Notice ID : 131552
Notice Type ID : INTER-REGIONAL TRANSFER
Notice Type Description : Inter-Regional Transfer limit variation
Issue Date : 10/12/2025
External Reference : Inter-regional transfer limit variation – Yass – Marulan 5 330kV line – NSW region – 10/12/2025

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation – Yass – Marulan 5 330kV line – NSW region – 10/12/2025

At 1616 hrs 10/12/2025 there was an unplanned outage of Yass – Marulan 5 330kV line.

The following constraint set invoked at 1625 hrs 10/12/2025
N-MNYS_5_WG_CLOSE

This constraint set contains equations with the following interconnectors on the LHS.
VIC1-NSW1, V-S-MNSP1

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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We’ve seen the ‘N-MNYS_5_WG_CLOSE’ constraint set before … such as in these articles.  It’s currently invoked out till 16:20 on Sunday 14th December 2025 …