EMMS - System Security Scheduler - October 2026

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.

The primary audience are:

• Procurers: AEMO or Transmission Network Service Providers (TNSPs) procuring contracts from the system security service provider.
• Providers: are parties entering into system security contracts with Procurers. Initially, AEMO anticipates providers to be Market Generators See Relevant Rules or Procedures (Scheduled and Semi-Scheduled) and Integrated Resource Providers with Battery Energy Storage Systems A small distributed battery storage for residential and commercial consumers (BESS Battery Energy Storage System).

Contents

Summary

This document outlines the technical changes and enhancements related to the EMMS Energy Market Management System (formerly MMS); software, hardware, network and related processes. - System Security Management Scheduler release scheduled for October 2026. It serves as guidance for business analysts and IT staff in participant organizations regarding system updates, data models, interfaces, and implementation timelines.

• Purpose and Audience: The document targets business analysts and IT staff in Registered Participant companies, including Procurers and Providers involved in system security service contracts. It details changes required for the October 2026 release of the System Security Management Scheduler. [1] [2]

• Release Schedule: The release is divided into two phases: Release A with pre-production on 12 May 2026 and production on 3 June 2026, and Release B with pre-production on 30 September 2026 and production on 28 October 2026. [3] [4]

• Key Enhancements: The release includes enhancements to the Markets Portal such as updated enablement instructions and asset availability interfaces, new interfaces for DUID and Region schedules, and new data model tables SSM_INDICATIVE_ROLL_DUID and SSM_INDICATIVE_ROLL_REGION. [5] [6]

• Rule and Procedure Changes: A revision to the Security Enablement Procedure is included, with details available through AEMO consultations. [7] [8]

• Data Model Update: Participants must upgrade to EMMS Data Model version 5.7 to receive new SSM tables in their Data Interchange environments. Auto-subscription applies to new files upon upgrade. [9] [10]

• Markets Portal Updates: New Region and DUID schedule screens will be added, allowing participants to view related information and legends. The design is ongoing, with more details to be provided. [11] [12]

• Implementation and Transition: Participants are advised to review the impact on their systems, upgrade their Data Model environments upon receiving scripts, and schedule resources for the production implementation. Pre-production testing is scheduled between 30 September and 28 October 2026. [13] [14]

• Project Goal: The Improving Security Frameworks (ISF) project aims to enhance market arrangements for system security services by reducing reliance on directions and improving incentives and transparency during the transition to a net-zero emissions power system. Release 1.1 focuses on fully automated enablement. [15] [16]

• Support and Resources: Participants can access related documents, guides, and support through AEMO’s website, including the Market Systems User Group for collaboration and feedback. No approval from participant changecontrollers is required for this release. [17] [18]