Enhancing Reserve Information (ERI) project
AEMO is implementing the ERI reform following the Australian Energy Market Commission’s final determination in the ERI rule change, on 21 March 2024. Changes will be made to improve the transparency of energy availability across the National Electricity Market (NEM) that will enable market participants to make more informed decisions about their own behaviour, including when periods of tighter supply-demand balance in the wholesale electricity market are anticipated.
Scope
Under the reform, three new measures will be introduced:
- Publication of previous day’s 5-min data for batteries
From 1 July 2025, AEMO will publish the previous trading days’ energy availability for batteries, by Dispatchable Unit Identifier (DUID) and for each five-minute dispatch interval (DI), at the end of the trading day (note that within the ERI rules, a ‘battery’ is a scheduled bidirectional unit, excluding pumped hydro). - Publication of daily energy limits (total availability) for scheduled generators
From 1 July 2025, AEMO will publish the daily energy limits (total availability) of scheduled generators (including pumped hydro), aggregated by region, at the start of the trading day. - Publication of aggregated state of charge of batteries in near-real time
From 1 July 2027, AEMO is to publish energy availability of batteries (i.e. state of charge in MWh), aggregated by region, each DI. Note that AEMO is exploring the publication of this data from mid-2025 for regions which already have several battery providers registered.
High Level Implementation Assessment (HLIA)
AEMO published a ERI Draft HLIA for consultation in June 2024 and the final ERI HLIA in July 2024. The HLIA is intended to assist affected participants to develop their own implementation timelines and impact assessments.
Implementation Toolbox
The Implementation Toolbox is a central location for useful resources to help participants understand and prepare for the changes associated with the rule implementation.
Timeline
| Timing | Element | Summary |
|---|---|---|
|
June 2024 |
High-level implementation assessment |
Overview of how AEMO intends to implement the reform. |
|
Jan 2025 |
Changes to EMMS data model published |
The EMMS data model technical specification will be updated |
|
April-May 2025 |
Industry testing of first changes |
Exact dates for testing to be determined |
|
1 July 2025 |
Go-live of first changes |
Rule commencement for changes 1 and 2. |
|
April-May 2027 |
Industry testing of final changes |
Exact dates of testing to be determined |
|
1 July 2027 |
Go live of final changes |
Rule commencement for change 3. |
Industry engagement
This initiative forms part of NEM Reform Program and market participants can get involved by visiting:
Further Information
For more information, please contact NEMReform@aemo.com.au.