Unplanned outage of Dapto – Marulan (8) 330 kV line

Since we wrote about the ‘Spicy prices forecast for NSW on Monday afternoon/evening 20th October 2025’, price forecasts have subsided again (as at the P30 predispatch run got 11:30).

But it remains a ‘watch this space’ and so we should highlight the unplanned outage of Dapto – Marulan (8) 330 kV line, which the AEMO flagged in MN129825 at 08:07 … which was coincidentally prior to the P30 predispatch run for 09:00 (NEM time), which was when the price forecasts stepped up:

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MARKET NOTICE
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From :              AEMO
To   :              NEMITWEB1
Creation Date :     20/10/2025     08:07:55

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Notice ID               :         129825
Notice Type ID          :         INTER-REGIONAL TRANSFER
Notice Type Description :         Inter-Regional Transfer limit variation
Issue Date              :         20/10/2025
External Reference      :         Inter-regional transfer limit variation – Dapto – Marulan (8) 330 kV line – NSW region – 20/10/2025

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation – Dapto – Marulan (8) 330 kV line – NSW region – 20/10/2025

At   0755 hrs 20/10/2025 there was an unplanned outage of Dapto – Marulan (8) 330 kV line.

The following constraint set(s) invoked at 0800 hrs 20/10/2025
N-DTMN_8_15M

This constraint set(s) contains equations with the following interconnectors on the LHS.
N-Q-MNSP1,NSW1-QLD1,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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Here’s a view of the  ‘N-DTMN_8_15M’ constraint set in ez2view:

This shows that (at the present time) the expectation is that the unplanned network outage will be finished by 17:00 (NEM time) today.