NER 5.3.9
The 5.3.9 workstream sought to address the NER 5.3.9 process and application challenges experienced by some generators and developers.
The objective of the workstream was to reframe how the NER 5.3.9 process applies to alterations, providing a cost-effective, consistent and transparent approach for all stakeholders.
Working in collaboration with industry, a series of resources have been developed to support proponents in undertaking a NER 5.3.9 application. These resources aim to guide stakeholders through the alterations process with the intent of making it clearer and more efficient.
The NER 5.3.9 Process Guideline outlines the application of the NER 5.3.9 process, including criteria, scoping, notification and assessment. The guideline provides specific advice on performance standards affected by alteration, the negotiation of affected performance standards, as well as model and data requirements.
A suite of guidelines, forms and supporting scenario fact sheets are available including:
- Change Mechanism Fact Sheet
- GS or IRS Change Form
- Like-for-like Replacement Fact Sheet
- Firmware Updates Fact Sheet
- Adding a BESS Behind a Connection Point
Background
The NER 5.3.9 clause sets out the regulatory change management process for assessing system alteration requests. Following feedback from industry, it was identified by generators and developers that the clause can be difficult to interpret and apply when altering a generating or integrated resource system.
In April 2023, AEMO engaged Clutch Strategic Services to undertake an independent review of the interpretation and application of the NER 5.3.9 process. The review involved understanding industry stakeholder issues and identifying potential solutions with the support of a Technical Focus Group, which was made up of 26 organisations and included generators and developers, Network Service Providers (NSPs), Original Equipment Manufacturers (OEMs) and AEMO.
You can read the final report here:
Webinar
AEMO hosted a webinar on 30 January 2026 to introduce and explain the NER 5.3.9 Guideline, Change Form and fact sheet series, and how they can be used in Proponents projects.