Market Notices

Change Number: CHG0110463

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: MSATS - Market Settlement & Transfer System
Change Title: MSATS 57.0 Flexible Trading Arrangement (FTA Release 1)


Support Information: Report any impacts to the AEMO Information and Support Hub or on External 1300 236 600.

Change Number: CHG0110834

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: Local Area Network
Change Title: Planned maintenance to Cisco ISE Servers

Support Information: Report any impacts to the AEMO Information and Support Hub or on External 1300 236 600.

Change Number: CHG0106232

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: Local Area Network
Change Title: Scheduled maintenance of Marketnet Firewall in Norwest

Support Information: Report any impacts to the AEMO Information and Support Hub or on External 1300 236 600.

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

Cancellation of reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits is no longer reasonably possible. There is no longer any lightning activity in the vicinity of the following lines. Accordingly its classification has reverted to a non-credible contingency event.

Region: VIC1

Lines: Yallourn - Rowville 7 220 kV and Yallourn - Rowville 8 220 kV

Cancellation time: 30/05/2026 19:24

Constraint set(s) revoked:
V-ROYP78_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Refer AEMO Electricity Market Notice 144167

Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

Reclassification of a Non-Credible Contingency Event as a Credible Contingency Event due to Lightning. AEMO considers the simultaneous trip of the following circuits to now be more likely and reasonably possible. Accordingly AEMO has reclassified it as a credible contingency event.

Region: VIC1

Lines: Yallourn - Rowville 7 220 kV and Yallourn - Rowville 8 220 kV

Duration: 30/05/2026 18:22 until further notice

Constraint set(s) invoked:
V-ROYP78_R_N-2 Constraint set contains the following interconnector(s) on the left hand side:
NONE


Auto-generated on behalf of Manager NEM Real Time Operations