Market Notices

AEMO ELECTRICITY MARKET NOTICE

Cancellation: Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5

Refer to Market Notice 144169

Direction is cancelled from: 2315 hrs 31/05/2026

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Cancellation - AEMO Intervention Event - SA region 31/05/2026

Refer to Market Notice 144170

The AEMO Intervention Event and all associated directions are cancelled from 2315 hrs on 31/05/2026.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Direction - SA region 31/05/2026

In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the SA region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).

The issue of the direction commences an AEMO intervention event. AEMO declares all trading intervals during the event to be intervention trading intervals, commencing from the interval ending 2150 hrs on 31/05/2026.

Intervention pricing does not apply to this AEMO intervention event.

AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Direction - in SA region to Origin Energy Electricity Limited - QUARANTINE PS UNIT 5

In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Origin Energy Electricity Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).

Direction issued to: Origin Energy Electricity Limited - QUARANTINE PS UNIT 5 at 2145hrs 31/05/2026
Type of resource: generating unit
Required actions: Remain Synchronised and follow dispatch targets at 2200 hrs 31/05/2026
Services provided: Voltage Control
Circumstances necessitating the Direction: Voltage
Circumstances necessitating the Direction additional detail: The synchronous generating units currently expected to be synchronised in SA will be inadequate to maintain sufficient Voltage Control in SA. Intervention is required to maintain the power system in a secure operating state
Expected duration: 2330 hrs 31/05/2026.

Origin Energy Electricity Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - QLD region - 29/05/2026

Refer AEMO Electricity Market Notice 144162

At 2135 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus was returned to service.

The cause of this non-credible contingency event has been identified and AEMO is satisfied that another occurrence of this event is unlikely under the current circumstances.

AEMO will not reclassify this event as a credible contingency event.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - QLD region - 29/05/2026

At 1013 hrs the Woolooga to Teebar Creek 8850 275kV Line and the Teebar Ck No2 275kV Bus tripped.

AEMO did not instruct load shedding.

AEMO has not been advised of any disconnection of bulk electrical load.


The cause of this non credible contingency event is not known at this stage.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation - Heywood M1 500/275kV XFMR - VIC region - 29/05/2026

A planned outage of Heywood M1 500/275kV XFMR in the VIC region was scheduled from 1100 hrs 25/05/2026 to 1800 hrs 29/05/2026.

The outage has been completed and Heywood M1 500/275kV XFMR returned to service at 0920 hrs 29/05/2026

Constraint set(s) revoked: V-HYTX_M12

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation - Koorangie to Wemen 220 kV Line - VIC region - 25/05/2026

At 1130 hrs 25/05/2026 there was a short notice outage of Koorangie to Wemen 220 kV Line.

The following constraint set(s) invoked at 1130 hrs 25/05/2026
V-KOWE

This constraint set(s) contains equations with the following interconnectors on the LHS.
V-S-MNSP1,T-V-MNSP1,V-SA,VIC1-NSW1

Refer to the AEMO Network Outage Scheduler for further information.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Inter-regional transfer limit variation - Tailem Bend 275 kV East Bus - SA region - 24/05/2026

At 1250 hrs 24/05/2026 there was a short notice outage of Tailem Bend 275 kV East Bus.

The following constraint set(s) invoked at 1250 hrs 24/05/2026
S-TB275_E_BUS

This constraint set(s) contains equations with the following interconnectors on the LHS.
V-SA

Refer to the AEMO Network Outage Scheduler for further information.

Manager NEM Real Time Operations