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Projected Assessment of System Adequacy (PASA)

Data is provided in comma delimited flat file format to enable access to a range of market data. Recent files are stored in a directory for current reports, and older files are moved into the archive reports directory.Prices quoted in these files are exclusive of GST.

File names include date and time stamps and a unique identifier to differentiate the files: eg.

Short Term PASA

This report is published every 2 hours and provides detailed disclosure of short-term power-system supply/demand balance prospects for six days following the next trading day. The information is provided for each half-hour within the report period. (Please see note)

Medium Term PASA

This file is produced weekly (on Tuesdays) and lists the medium-term supply/demand prospects for the period two years in advance. The information is provided for each day within the report period.

Each week participants must submit forecasts of availability to AEMO for the next 24 months, commencing eight days after the publication date of the Medium Term PASA report. These forecasts form the basis of the Medium Term PASA report that will be produced the following week. (Please see note)

The MTPASA graphs are available through the Participants Markets Portal area at https://portal.prod.nemnet.net.au/

For any questions please contact the Information and Support Hub via supporthub@aemo.com.au or call 1300 236 600.

The MTPASA process description and the Reliability Standard Implementation Guidelines (RSIG) contain information on how AEMO administers MTPASA process. Please click here to access the latest RSIG (632 KB, pdf) and click here to access the MTPASA process description (925 KB, pdf).

In May 2018, AEMO implemented a revised MTPASA methodology following industry consultation. More information can be found on the Reliability Standard Implementation Guidelines Consultation.

Medium Term PASA Region Availability

This report file contains, for each region and each day over the current MTPASA run timeframe (next 104 weeks, starting Sunday):

  • the region-aggregate offered MTPASA Availability for all scheduled generating units registered on that day; and
  • the latest date time an MTPASA offer was submitted for any scheduled generating unit for that region and day

The aggregated data is derived solely from the MTPASA offers provided by Scheduled Generators under clause 3.7.2 (d)(1) of the National Electricity Rules. If no MTPASA offer exists for a particular week, the aggregation calculation uses the latest MTPASA offer from the previous week.

The report is updated at 0900, 1200, 1500 and 1800 hrs EST each day (excluding Sundays), and published around 18 minutes later. 
The report will assist Scheduled Generators in meeting their obligations under the insider trading provisions of the Commonwealth Corporations Act 1989, by allowing them to provide timely disclosure of the implications of their generation outage plans prior to seeking financial cover through securities dealings.


The National Electricity Market registration classification of Yarwun Power Station Unit 1 (dispatchable unit ID: YARWUN_1) is market non-scheduled generating unit. However, it is a condition of the registration of this unit that the Registered Participant complies with some of the obligations of a Scheduled Generator. This unit is dispatched as scheduled generating unit with respect to its dispatch offers, targets and generation outputs. Accordingly, information about YARWUN_1 is reported as scheduled generating unit information.

The Tumut 3 Pumps (dispatchable unit ID: SNOWYP) are not classified as scheduled load in the National Electricity Market. However, they are required to comply with some of the obligations of a Market Customer in respect of a scheduled load. The Tumut 3 Pumps are dispatched as if they were scheduled loads with respect to their dispatch bids, targets and consumption. Accordingly, information about SNOWYP is reported as market scheduled load information.


This data is provided for information only and is not intended for commercial use. AEMO does not guarantee the accuracy of the data or its availability at all times.

MTPASA Bid Format and Validation

Medium Term Projected Assessment of System Adequacy (MTPASA) offers can be submitted by file to an AEMO file server or can be handled using the EMMS web portal (view, create and update). For details of MTPASA offer file format and validation, see the document MTPASA Bid Format and Validation (below).

For registered participants looking for interactive MTPASA offer submission, please use the EMMS web portal (EMMS > Offers & Submissions > MTPASA Offers).

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