Today marks the go-live date for the AEMO’s new unit-level availability data and other STPASA changes, on 31st July 2025

Following an initial proposal from AEMO in June 2021, the AEMC made a final determination in May 2022 to amend the NER provisions related to the ST PASA process. These amendments were intended to introduce greater flexibility, revise certain definitions and obligations, and mandate submission of availability data from participants from July 1st, 2025.

The final rule, titled “Updating Short Term PASA,” established a principles-based framework for AEMO to manage ST PASA, introduced a requirement to publish these procedures, and included changes to the ST PASA publication schedule, the definition of ‘energy constraint’, and PASA availability.

Back in June, we shared the AEMO’s Go-live Plan document for these changes (and related incoming changes in regards to the Enhanced Reserve Information initiative).

According the timeline on pg. 13, today — the July 31st, 2025 — marks the day that:

AEMO will publish NEM Reports for ST PASA to Production. Specifically, change to PDPASA and STPASA reports and the new PDPASA_AVAILABILITY AND STPASA_AVAILABILITY reports.

Note:

• Modified next-day bids reports will include Recall_Period, commencing from the publication at 0400 hrs on 1 August 2025 for trading date 31 July 2025
• New real-time PDPASA and SDPASA DUID Availability reports will include Available Capacity, PASA Availability and Recall_Period
• Modified PDPASA and STPASA reports will include a change to the Region Availability calculation to use PASA Availability if Recall_Period ≤ 24 hours , else to use Max Avail