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 determination “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

The objectives of this Project are to publish procedures outlining the ST PASA process and describe recall period: 

• how AEMO will prepare inputs for the short term PASA 
• the detailed short term PASA information AEMO will publish 
• the processes or methodologies AEMO will apply to produce the short term PASA information;
• the period to be covered by the short term PASA
• any other information that AEMO considers reasonably necessary to implement the PASA objective  

Note that AEMO’s processes to manage reliability of supply (including when intervention is necessary) are not included in the scope of this Project.

The Project will also deliver the system changes associated with the recall time and unit level availability information. Note however that changes to the PD/ST PASA calculation are being progressed in parallel through the ST PASA Replacement Project. 

Industry engagement

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

Timeline

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.

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

Reference information

Further information

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