Market Notices

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: NSW1

Lines: Bayswater - Mt Piper No.5A3 500kV and Wollar - Mt Piper No.5A5 500kV

Duration: 06/07/2025 15:21 until further notice

Constraint set(s) invoked:
NONE

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: NSW1

Lines: Bannaby - Mt Piper 5A6 500kV and Bannaby - Mt Piper 5A7 500kV

Duration: 06/07/2025 14:50 until further notice

Constraint set(s) invoked:
N-5A6+5A7_N-2 Constraint set contains the following interconnector(s) on the left hand side:
N-Q-MNSP1
NSW1-QLD1
VIC1-NSW1


Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE QLD1 Region Friday, 4 July 2025

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

Unit: TARONG#3
Duration: 04/07/2025 16:40 to 04/07/2025 16:45
Amount: -18 MW
Constraint: NC-Q_TARONG#3

Auto-generated on behalf of Manager NEM Real Time Operations

Change Number: CHG0102957

Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Gas Hub
Change Title: Roll out of TLS 1.3 support for Gas B2B Hub and disable TLS versions 1.0/1.1
Change Start Date & Time: 03/08/2025 10:00:00
Change End Date & Time: 03/08/2025 14:00:00
Outage Start Date & Time:
Outage End Date & Time:
Environment: Production

Participant Impact and Requirements: The Gas B2B hub servers will be updated to support TLS (Transport Layer Security) 1.3 version. Also the legacy versions 1.0 and 1.1 will be disabled and not be supported going forward. Participants are required to use TLS 1.2 as a minimum protocol to communicate with AEMO, failing to do so will impact the connectivity. An outage is not expected but, there may be some minor interruptions during the change period.

Participants are required to make sure the connectivity is intact post change implementation. In case of any issues noticed, please reach out to AEMO Support Hub.

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.

Change Number: CHG0104481

Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Electricity Market Management System_PreProd
Change Title: Update Shareplex NuTCracker resource allocation
Change Start Date & Time: 08/07/2025 10:00:00
Change End Date & Time: 08/07/2025 17:00:00
Outage Start Date & Time: 08/07/2025 10:00:00
Outage End Date & Time: 08/07/2025 12:00:00
Environment: Pre-Production

Participant Impact and Requirements: The Pre-Production Electricity Market Management System(EMMS) ,Frequency Performance Payments (FPP) ,Gas Supply Hub (GSH) will be unavailable during the scheduled outage window.


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.

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE NSW1 Region Thursday, 3 July 2025

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

Unit: WTAHB1
Duration: 03/07/2025 14:05 to 03/07/2025 14:10
Amount: 13 MW
Constraint: NC-N_WTAHB1

Auto-generated on behalf of Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE

NON-CONFORMANCE QLD1 Region Thursday, 3 July 2025

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

Unit: ULPBESS1
Duration: 03/07/2025 10:50 to 03/07/2025 11:00
Amount: 7 MW
Constraint: NC-Q_ULPBESS1

Auto-generated on behalf of Manager NEM Real Time Operations

Change Number: CHG0103089

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: EMMS - Dispatch
Change Title: ERI & STPASA Recall Period Production Release

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

Change Number: CHG0104394

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MarketNet
Change Title: Planned maintenance affecting the AEMO Market Network.
Change Start Date & Time: 09/07/2025 07:00:00
Change End Date & Time: 09/07/2025 17:00:00
Outage Start Date & Time:
Outage End Date & Time:
Environment: Production
Participant Impact and Requirements: Planned maintenance will be conducted on the 9th of July 2025, between 07:00AM and 05:00PM AEST on the core network infrastructure within the AEMO Market Network in Brisbane.

During the change, there will be two instances of 1-3 second service disruption to MarketNet Services accessed via Brisbane as traffic moves from the active to the standby load balancing unit. All Services should return to normal after this time. Traffic via Sydney will not be affected during this period. AEMO recommends that all market participants with site-to-site VPN connections currently connected via Brisbane, to switch these connections to the Sydney site as a precaution.

Participants connecting via IPWAN and/or SSL VPN will be automatically connected to the Sydney site and do not need to take any action.

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.