Rule Change: Open

Overview

The AEMC has published a draft rule for improving the quality and transparency of information that is collected and published about the future availability of generators as part of the medium-term projected assessment of system adequacy (MT PASA) process.
View more

The AEMC has published a draft rule for improving the quality and transparency of information that is collected and published about the future availability of generators as part of the medium-term projected assessment of system adequacy (MT PASA) process.

We are seeking stakeholder feedback on the draft determination and rule with submissions due by 7 July 2022

The draft rule builds on existing MT PASA arrangements, which require generators to indicate how many megawatts (MW) they could make available each day, by requiring scheduled generators to also provide a:

  • "unit state" in the form of standardised reason codes that explain why a scheduled generating unit is or is not available
  •  "unit recall time" to indicate the period in which the plant could be made available under normal conditions after a period of unavailability. 

AEMO would develop the form and approach for collecting and publishing both reason codes and recall times and this would be reflected in updates to the Reliability standard implementation guidelines (RSIG) and the MT PASA process description. This work would include determining which unit states will require a unit recall time to be submitted. AEMO would also be required to consult with stakeholders through the Rules consultation procedures when updating the RSIG.

Improving the quality and transparency of information about future generator availability, and making it publicly available, can give stakeholders a more nuanced view about what the supply outlook may look like under different future scenarios. This includes scenarios where less flexible generators make changes to their operating schedules as they near the end of their technical life.

This would contribute to better operational, planning, policy and investment decisions as the power system transitions and ultimately support a more coordinated approach to delivering a lower emissions electricity system that is reliable and affordable.  

This draft rule actions one of the Energy Security Board's (ESB) post-2025 recommendations  to improve resource adequacy outcomes in the NEM.

Rule change request 

On 15 December 2021, the AEMC received a rule change request from AEMO to amend the National Electricity Rules (NER) to collect and publish more detailed information about scheduled generator availability in the MT PASA.

AEMO’s request notes that the NEM power system is rapidly transitioning toward a lower-emissions generation fleet and this may drive changes to legacy thermal plant operating regimes. These changes may bring uncertainties and therefore challenges in maintaining system security and reliability.

The request proposes to manage these challenges by increasing the information on generator availability collected by AEMO and published to market participants. AEMO proposes to gather and publish reasons for changes in availability and recall time to full availability under proposed changes to clauses 3.7.1 and 3.7.2 of the NER.

Consultation paper

On 3 February 2022, the AEMC published a consultation paper seeking stakeholder views on the proposal.

Submissions closed on 3 March 2022. 8 submissions were received and are published below

Extension

On 7 April 2022, the AEMC extended the date of the draft determination to 26 May 2022. The extension allows for further consultation with participants and market bodies to respond to complex issues raised in stakeholder submissions to the consultation paper.
 

View less

Documentation