Market Notices

Change Number: CHG0110447

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: 30/04/2026 10:00:00
Change End Date & Time: 30/04/2026 18:00:00
Outage Start Date & Time: 30/04/2026 12:00:00
Outage End Date & Time: 30/04/2026 18:00:00
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.

Change Number: CHG0110369

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MSATS - Consumer Administration and Transfer Solution(CATS)_PreProd
Change Title: MSATS 57.0 Flexiable Trading Arrangement (FTA Release 1)

Change Start Date & Time: 28/04/2026 13:00:00
Change End Date & Time: 28/04/2026 17:00:00
Outage Start Date & Time: 28/04/2026 13:00:00
Outage End Date & Time: 28/04/2026 17:00:00
Environment: Pre-Production
Participant Impact and Requirements: Users will not be able to access MSATS during the outage period.

Meter data processing and RM reports will not be available during the outage period.

User Rights Management (URM) will continue to operate, however the administration screens will not be accessible.

MSATS B2B/B2M Transactions and B2B MSATS Screens will be unavailable during this outage

NMI Discovery will not be available during the outage period.

CDR and CDP will not be available during the outage period

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: CHG0110362

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: MSATS - Consumer Administration and Transfer Solution(CATS)_PreProd
Change Title: Pre-Prod MSATS 56.2 Maintenance Patch Release

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

Change Number: CHG0108549

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MSATS - Market Settlement & Transfer System
Change Title: eMDM April Maintenance Release
Change Start Date & Time: 26/04/2026 10:00:00
Change End Date & Time: 26/04/2026 14:00:00
Outage Start Date & Time: 26/04/2026 10:00:00
Outage End Date & Time: 26/04/2026 14:00:00
Environment: Production
Participant Impact and Requirements: Users will not be able to access MSATS during the outage period.

Meter data processing and RM reports will not be available during the outage period.

User Rights Management (URM) will continue to operate, however the administration screens will not be accessible.

MSATS B2B/B2M Transactions and B2B MSATS Screens will be unavailable during this outage

NMI Discovery will not be available during the outage period.

Network Outage Scheduler (NOS) B2B Transactions submitted via FTP will not be processed during this outage period. The NOS application will still be available.

CDR and CDP will not be available during the outage period.

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: CHG0110362

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: MSATS - Consumer Administration and Transfer Solution(CATS)_PreProd
Change Title: Pre-Prod MSATS 56.2 Maintenace Patch Release
Change Start Date & Time: 20/04/2026 13:00:00
Change End Date & Time: 20/04/2026 17:00:00
Outage Start Date & Time:
Outage End Date & Time:
Environment: Pre-Production
Participant Impact and Requirements: Users will not be able to access MSATS during the outage period.

Meter data processing and RM reports will not be available during the outage period.

User Rights Management (URM) will continue to operate, however the administration screens will not be accessible.

MSATS B2B/B2M Transactions and B2B MSATS Screens will be unavailable during this outage

NMI Discovery will not be available during the outage period.

CDR and CDP will not be available during the outage period.

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: CHG0110092

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: Cisco IP Phone
Change Title: Telco Outage Notification - Telstra Brisbane Indial (07 3347 XXXX-XXXX)

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

Change Number: CHG0110059

Notification issued to: Market Notice
Notification Type: Completed
Change Type: Normal
Service/Component: Cisco IP Phone
Change Title: Telco Outage Notification - Telstra Melbourne Indial (03 9609 XXXX-XXXX)

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

AEMO ELECTRICITY MARKET NOTICE.

Non-credible contingency event - VIC region - 15/04/2026

At 1506 hrs the JLysaght - Tyabb 1 220kV Line and the JLysaght - Tyabb 2 220kV Line tripped.

AEMO did not instruct load shedding.

AEMO has been advised of disconnection of 16 MWs of bulk electrical load.

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

Change Number: CHG0108970

Notification Type: Completed
Change Type: Normal
Service/Component: Declared Wholesale Gas Market
Change Title: Planned System Maintenance - Declared Wholesale Gas Market (DWGM) Production

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