Market Notices

Change Number: CHG0105004

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Windows Server
Change Title: Planned system maintenance to the EMMS PreProduction Environment
Change Start Date & Time: 01/08/2025 09:30:00
Change End Date & Time: 01/08/2025 17:30:00
Outage Start Date & Time: 01/08/2025 09:30:00
Outage End Date & Time: 01/08/2025 14:30:00
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.

Change Number: CHG0102961

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: 05/08/2025 10:00:00
Change End Date & Time: 05/08/2025 16:00:00
Outage Start Date & Time: 05/08/2025 10:00:00
Outage End Date & Time: 05/08/2025 16:00:00
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.

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.

Start Time: 03/08/2025 10:00 AM
End Time: 03/08/2025 14:00 PM

Change Number: CHG0104496

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Local Area Network
Change Title: Planned Firewall maintenance in Brisbane
Change Start Date & Time: 09/08/2025 10:00:59
Change End Date & Time: 09/08/2025 16:00:59
Outage Start Date & Time:
Outage End Date & Time:
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) - Up to 4 hour outage for participants who have established their VPN connection/s via the AEMO QLD datacenter termination point (202.44.76.10 for Policy Based VPN's or 202.44.76.12 for Route Based VPN) only - All L2L connections should be established to both QLD / NSW.

Note: Participants are encouraged to ensure their VPN connections are already established or are configured (as per AEMO best practice) to automatically failover to the alternate AEMO NSW datacenter termination point (202.44.78.10 or 202.44.78.12) prior to this scheduled outage. *** Failure to do so will impact connectivity to Marketnet Services ***.

B2B VPN - No impact is expected.

SSL VPN Participants: None expected as DNS entry will be updated to remove QLD IP.

GASHUB: A brief interuption of up to 60 seconds while services are failover from QLD to NSW Datacenter.

Other Impacts will have been 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: CHG0104998

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Cisco IP Phone
Change Title: Telco Outage Notification - Telstra Norwest Indial (02 8884 5000-5999)
Change Start Date & Time: 30/07/2025 00:00:00
Change End Date & Time: 30/07/2025 06:00:00
Outage Start Date & Time: 30/07/2025 00:00:00
Outage End Date & Time: 30/07/2025 06:00:00
Environment: Production
Participant Impact and Requirements: External/Market

Outage Duration:
1 x 10 minutes during the window

Impacts:
Reduced redundancy for Inbound and Outbound Calls (automatically rerouted via Brisbane).

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: CHG0104999

Notification issued to: Market Notice
Notification Type: Initial
Change Type: Normal
Service/ Component: Cisco IP Phone
Change Title: Telco Outage Notification - Telstra Brisbane Indial (07 3347 XXXX-XXXX)
Change Start Date & Time: 30/07/2025 00:00:00
Change End Date & Time: 30/07/2025 06:00:00
Outage Start Date & Time: 30/07/2025 00:00:00
Outage End Date & Time: 30/07/2025 06:00:00
Environment: Production
Participant Impact and Requirements: External/Market

Outage Duration:
1 x 10 minutes during the window

Impacts:
Reduced redundancy for Inbound and Outbound Calls (automatically rerouted via Sydney).

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

Inter-regional transfer limit variation - South_East N 275kV BUS - SA region - 27/07/2025

A planned outage of South_East N 275kV BUS in the SA region was scheduled from 0730 hrs 23/07/2025 to 1730 hrs 27/07/2025.

The outage has been completed and South_East N 275kV BUSt returned to service at 1100 hrs 27/07/2025

Constraint set(s) revoked: S-SECB6611_10

Manager NEM Real Time Operations

AEMO ELECTRICITY MARKET NOTICE.

Update - Non-credible contingency event - NSW region - 26/07/2025

Refer AEMO Electricity Market Notice 128353

At 0832 hrs the Canberra A 132kV 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 - NSW region - 26/07/2025

At 0449 hrs the Canberra 132 kV A Bus and the Canberra to Latham A2 132 kV Line 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