Amendments to the Inertia Requirements Methodology

Market National Electricity Market
StageDiscussion Paper
ConvenorAEMO NEM
Accepting submissions?Yes
Submissions close02/08/2024


  • Consultation paper published
    5 July 2024
  • Submissions due on consultation paper
    2 August 2024
  • Draft report published, including a draft Inertia Requirements Methodology
    Expected 9 September 2024
  • Submissions due on draft report
    Expected 7 October 2024
  • Final report published, including a draft Inertia Requirements Methodology
    Expected 5 November 2024

Matter 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 requirements for the Inertia Requirements Methodology. 

AEMO is now consulting amendments to the Inertia Requirements Methodology in accordance clause 5.20.4 and the Rules consultation procedures in rule 8.9 of the National Electricity Rules (NER).  

Submissions are due to by 5pm AEST on 2 August 2024. Please note that submissions will be published, other than confidential material, as per AEMO’s Consultation submission guidelines.


Key changes

The key changes to the Inertia Requirements Methodology are to introduce a system-wide inertia level to support secure interconnected operation on the mainland, a methodology for apportioning the system-wide inertia level to each inertia sub-network, a description of how AEMO determines the likelihood of a sub-network islanding risk, and a new inertia network services specification to enable procurement of synthetic inertia. The rule change also aligns the procurement timeframes of the system strength and inertia frameworks and allows shortfalls in inertia network services to be identified under the Network Support and Control Ancillary Services (NSCAS) framework in the near term.

In addition, AEMO expects other drafting improvements or corrections may be necessary to reflect minor terminology updates, the latest frequency operating standards, and the 2023 introduction of the 1-second Frequency Control Ancillary Services (FCAS) market.

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