Market IT systems

IT change and release management

This page lists schedules for IT changes and releases across AEMO’s electricity and gas market systems. All change management is governed under the IT Change Management Policy and Procedure.

IT changes

AEMO’s IT change schedule informs AEMO participants in advance about IT changes and provides a consolidated view of the changes planned. This is another step towards standardising the maintenance and outage windows for AEMO’s market-facing systems, helping to better manage any impact as well as overall planning of changes and releases.

Forward schedule of IT changes

The fortnightly forward schedule of IT changes lists all planned maintenance, as well as the status history of each of AEMO’s business services.

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Outage and maintenance windows

The IT outage and maintenance windows (change windows) for major system changes outline specific timeframes when IT changes will occur.

Market Systems User Group (MSUG) Meeting

Technical Specifications

Technical specifications provide IT system and application information affecting participants as a result of a rule change or a project. They communicate the design and implementation timeline so participants can plan their IT resources to update their own systems. 

National Electricity (NEM) and Gas Market Technical Specifications

Wholesale Electricity Market (WEM)

Environments

The table below details the release and build which is currently running in each environment. The snapshot date indicates the date at which the last snapshot of Production market data was taken for the environment, as applicable.

Environment Version Snapshot date Link
Production WEMS 4.1 (Build 4.1-1573-25)
RCM version 3.2 (Build 3.2-511.0)
WEM PaSS 3.10 (Build 3.10-847-2)
https://wems.aemo.com.au/
Market Trial WEMS 4.1 (Build 4.1-1573-27)
RCM version 3.2 (Build 3.2.596)
WEM PaSS 3.10 (Build 3.10-850-1)  		 27/06/2025 https://wems-mkt.aemo.com.au/

Market Trial environments can simulate the operation of the WEM, but actual market outcomes may vary in these environments due to testing activities of Market Participants and AEMO, differences in software versions, and the time since the last snapshot.

Gas markets and systems

Contact us

Please contact Change Management for further information.

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