Market Notices

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

AEMO ELECTRICITY MARKET NOTICE

Cancellation - AEMO Intervention Event - SA region 24/05/2026

Refer to Market Notice 144136

The AEMO Intervention Event and all associated directions are cancelled from 1220 hrs on 24/05/2026.


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Cancellation: Direction issued to: AGL SA Generation Pty Limited - BARKER INLET PS

Refer to Market Notice 144135

Direction is cancelled from: 1220 hrs 24/05/2026

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Direction - SA region 24/05/2026

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 0405 hrs on 24/05/2026.

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 AGL SA Generation Pty Limited - Barker Inlet Power Station


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

Direction issued to: AGL SA Generation Pty Limited - Barker Inlet Power Station at 0400 hrs 24/05/2026
Type of resource: generating unit
Required actions: Synchronise and follow dispatch targets at 0405 hrs 24/05/2026
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: Until further notice.

AGL SA Generation Pty 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 PARTICIPANT NOTICE

Cancellation - Direction - Qld region - 23/05/2026

Refer to Market Notice 144132

The requirement for AEMO to issue a direction to maintain the power system in a secure operating state has ended. All associated directions are cancelled from 1430 hrs on 23/05/2026.

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Direction - Qld region 23/05/2026

In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the Qld region.

The direction was necessary to maintain the power system in a secure operating state.

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.

For the purposes of the National Electricity Rules this was a clause 4.8.9 instruction under clause 4.8.9(a).


Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE QLD1 Region Saturday, 23 May 2026

AEMO has declared the following unit as non-conforming under clause 3.8.23 of the National Electricity Rules:

Unit: STAN-1
Duration: 23/05/2026 11:25 to 23/05/2026 11:30
Amount: 22 MW
Constraint: NC-Q_STAN-1

Auto-generated on behalf of Manager NEM Real Time Operations

Change Number: CHG0110834

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Local Area Network
Change Title: Planned maintenance to Cisco ISE Servers
Change Start Date & Time: 30/05/2026 10:00:00
Change End Date & Time: 30/05/2026 17:00:00
Outage Start Date & Time: 23/05/2026 10:00:00
Outage End Date & Time: 23/05/2026 17:00:00
Environment: Production
Participant Impact and Requirements: The following impacts are expected to participant connectivity during this planned outage:

IPWAN Participants - No impact is expected

Lan-2-Lan VPN Participants (IPSEC) - No impact is expected

B2B VPN - No impact is expected.

SSL VPN Participants: There may be a delay in authenticating to the SSL VPN however existing connections should not be impacted.

GASHUB: No impact is expected.

Any other expected impacts, in addition to those listed above, will be communicated in advance.

Support Information:
Report any impacts to the AEMO Information and Support Hub or call 1300 236 600.
Please refer to https://aemo.service-now.com/participantportal?id=pp_services_status for any planned/unplanned maintenance activities.