Amendments to NSCAS Description and Quantity Procedure consultation

Consultation process

Key contact:

2024_security_consultations@aemo.com.au

Matters under consultation

In March 2024, the Australian Energy Market Commission (AEMC) released its final determination on Improving security frameworks for the energy transition rule change. This introduced new rule requirements for the Network Support and Control Ancillary Services (NSCAS) Description and Quantity Procedure (Procedure).

AEMO has now completed the two-stage Rules consultation on amendments to the Network Support and Control Ancillary Service (NSCAS) Description and Quantity Procedure (the Procedure) in accordance with Clause 5.20.2 and the Rules consultation procedures in rule 8.9 of the National Electricity Rules (NER).

Key changes

AEMO received two submissions on the draft report, in which the main issues raised were:

• Seeking further justification for a three-sigma from the mean probabilistic approach for system strength and inertia gap declarations, and whether this is an appropriate measure to use.
• A request for clarification on the types of system strength and inertia needs quantified as potential NSCAS needs and gaps.

This final report includes AEMO’s responses to those issues and other comments made in submissions. After considering the submissions, AEMO has decided not to change the position set out in its draft report and draft Procedure. AEMO’s final determination on the proposal is to amend the Procedure in the form published with this final report, with an effective date of 1 December 2024.