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ISF and IPRR Consultation of Constraint Formulation Guidelines

30/10/2025
Market National Electricity Market
StageFinal Report
ConvenorAEMO NEM
Initiated07/04/2025
Accepting submissions?No

Timeline

  • Consultation paper published
    7 April 2025
  • Submissions due on consultation paper
    8 May 2025
  • Draft report and related documents published
    15 August 2025
  • Submissions due on draft report and related documents
    23 October 2025
  • Final report and related documents published
    30 October 2025

Key contact

A mail icon. Email: [email protected]

Matters under consultation

AEMO has concluded consultation on the changes to the Constraints Formulation Guideline under National Electricity Rules (NER) 3.8.10(c).

AEMO consulted on two changes as required for:

  1. the National Electricity Amendment (Improving security frameworks for the energy transition) Rule 2024 No. 9 (ISF Rule) commencing 2 December 2025 - an added section for security service formulation constraints
  2. the National Electricity Amendment (Integrating price-responsive resources into the NEM) Rule 2024 No. 24 (IPRR Rule) commencing 23 May 2027 – including the new terminology “voluntarily scheduled resources”

AEMO also used this opportunity to consult on changes proposed through the consultation on the Congestion Information Resource (CIR) for changing the minimum threshold for left-hand side factors to 0.15 from 0.07.

AEMO thanks all stakeholders for their feedback throughout this consultation.

This version of the CFG will be effective from 2 December 2025. Please refer to Congestion Information Resources for the current CFG.

  • First stage
  • Second stage
  • Final documents

First stage documents

Submissions

Second stage documents

Supporting documents

Submissions

More information

ConsultationsNational Electricity Market
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