1 Introduction

1.1 Audience

AEMO Australian Energy Market Operator provides this information as a service targeting business analysts and IT staff in Registered Participant See Relevant Rules or Procedures companies.

  1. The primary audience is business analysts and IT staff in Registered Participant companies.

  2. The secondary audience is IT staff from Scheduled Bidirectional Units (BDUs) and Scheduled Generators.

1.2 Objective

The EMMS Energy Market Management System (formerly MMS); software, hardware, network and related processes. - Technical Specification - July 1 2025 (Release) describes the projects planned by AEMO from a participant perspective and includes any system related changes for participants.

1.3 Status

Version

Status

1.00

Updated version based on the design. We still expect changes to the design while development and testing are in progress.

0.01

Initial Draft for review. The design is not ready for participants’ builds

Presents the EMMS - Technical Specification - July 1 2025 evolving design.

Please send feedback to Contact Us. In the Details of your enquiry section, mention the EAS Knowledge Management team as the Resolver group.

 

1.4 Release dates

Scheduled for implementation in:

  • Pre-production:     Wednesday 21 May 2025

  • Production:        Tuesday 1 July 2025

1.5 Projects and enhancements

Changes and enhancements for this Release include:

No.

Functionality

Change

1

APIs

For more information, see 4.2 High-level changes

2

EMMS Data Model v5.5

3

Markets Portal

1.6 Rule and procedure changes

Title

Project

Version/status

Effective

Enhancing reserve information (formerly Operating reserves)

 

Final

1 July 2025

NEM Dispatch Engine (NEMDE)

 

 

 

1.7 Related technical specifications

Title

Description

EMMS – Technical Specification – Data Model v5.5 – April 2025

Updated

1.8 Related documents

These guides and resources are updated according to this technical specification and published for the pre-production Release Date.

Title

Description

Status

Markets Portal Help

Updates the Energy and FCAS Bidding topics:

  • Energy and FCAS Web Bids

  • Format and Validation for FTP Energy, FCAS and MNSP Bids and Offers

  • Bidding Validation Messages

Not started

Data Interchange Online help

Help using Data Interchange and the Data Model

Not started

NEM Dispatch Bidding API Reference

Allows authorised participants to submit and retrieve their NEM Dispatch Bids/Offers.

Not started

1.9 Approval to change

There is no approval or agreement to change required from participant change controllers for this Release.

No approval or agreement to change required from participant change controllers. Agreement was sought in the May 2022 readiness working group (RWG).

1.10 Market systems user group meetings

The Market Systems User Group (MSUG Market Systems User Group) is an industry user group established to discuss NEM wholesale and retail IT systems releases. Its purpose is to facilitate the continuing improvement of AEMO's IT systems by seeking feedback and collaboration from participants.

MSUG meetings are open to all interested parties, with invitations sent to all included on the distribution list. If you have a technical question for a project and want to attend the MSUG ask your company’s support team to include your email address in their AEMO Help Desk Bulletin (CRM) distribution list.

1.11 Version numbers

Incremental version numbers such as 1.01, 2.01 and so on mean there is a minor change to the technical specification.

Major version numbers such as 1.00, 2.00 means there are substantial changes to the technical specification. Participants must carefully review these changes, detailed Page 1.

1.12 Changes in this version

This version includes the following updates: