ST PASA Procedure and Recall Period

Background

In May 2022, the AEMC made a final determination to amend the NER provisions relating to the ST PASA to introduce greater flexibility to ST PASA, revise some ST PASA definitions and obligations and require the commencement of the new ST PASA from 1 July 2025.

The final rule “Updating Short Term PASA” introduced a principles-based approach for AEMO to administer ST PASA, included an obligation to publish a ST PASA Procedure, made changes to ST PASA publication timetable, the definition of ‘energy constraint’ and PASA availability.

AEMO has established the ST PASA Procedure and Recall Period Project under the NEM Reform Program to implement resulting system and procedure changes collaboratively with industry.  

Procedure and Recall Period Scope

This project will introduce a principles-based framework, linked to the PASA objective, to guide AEMO’s administration of ST PASA. Other changes, include a requirement for AEMO to publish availability information for individual scheduled resources, and amended definitions of PASA availability and energy constraints.

In due course, this rule will facilitate the implementation of AEMO’s ST PASA Replacement Project. As that project has been delayed beyond its original implementation date, this Project scope only includes initial Procedures that will not materially change the operation and administration of ST PASA, other than in relation to the new information requirements. This Project will also deliver the system changes associated with the recall time and unit level availability information.

Note
AEMO’s processes to manage reliability of supply (including when intervention is necessary) are not included in the scope of this Project. However changes to the PD/ST PASA
calculation are being progressed in parallel through the ST PASA Replacement Project.

High-Level Implementation Assessment (HLIA)

This HLIA sets out the high-level impact assessment of the Rule’s implementation arrangements by:

• Publishing new Procedures which will not materially change the operation and administration of ST PASA other than in relation to the new information requirements.
• Outlining how AEMO’s system and related changes will occur; and
• Enabling participants and other stakeholders to understand and plan for system, process and operational changes as required to implement the Rule through consultation and key implementation dates.

Industry engagement

This initiative forms part of NEM Reform Program and market participants can get involved by visiting:

Timeline

Record of activities

Procedure changes 

• AEMO’s Procedures, guidelines and other documents that require changes include: 
• ST PASA Process Description (developing new ST PASA Procedure)
• Reliability Standard Implementation Guidelines (RSIG)  
• Spot Market Timetable

Further information

For further information please contact NEMReform@aemo.com.au.