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Ancillary services causer pays contribution factors

One of the features of the ancillary service market is that only the costs for frequency control regulation services are to be allocated in accordance with the contribution factors, as set out in clause 3.15.6A of the National Electricity Rules and detailed in the following causer pays procedure.

Application period Contribution factors Aggregated performance factors 5-minute performance factors  Contingency exclusions Other exclusions 
2020
 26/01/2020 to 22/02/2020  Link to PDF  Link to PDF  Link to PDF  Link to PDF Link to PDF 
           
           

Under the Rules, AEMO must update these contribution factors every four weeks, and publish the factors at least 10 business days prior to them being applied in the market.

The Rules also require AEMO to publish the historical data used to calculate these factors. This historical data is available here on the AEMO web site.

Final factors used in settlements may vary slightly from previously published values due to minor error corrections.

AEMO calculates contribution factors normalised according to region demand. 

Ancillary Service Market Causer Pays factors - application period 26 January 2020 to 22 February 2020.

The following dispatch intervals were discarded in the contribution factor calculation process for the QLD, NSW, VIC, and SA regions for the sampling period 8 December 2019 to 5 January 2020 for reasons other than the effect of contingencies and the data samples where FI and system frequency were mismatched.

  • Mainland Excluded Dispatch Intervals

    8/12/2019 12:15:00 hrs to 8/12/2019 13:25:00 hrs
    9/12/2019 9:40:00 hrs to 9/12/2019 9:50:00 hrs
    10/12/2019 6:25:00 hrs to 10/12/2019 9:10:00 hrs
    11/12/2019 17:50:00 hrs to 12/12/2019 9:15:00 hrs
    12/12/2019 5:00:00 hrs to 12/12/2019 7:45:00 hrs
    18/12/2019 12:40:00 hrs to 18/12/2019 12:40:00 hrs
    18/12/2019 12:55:00 hrs to 18/12/2019 12:55:00 hrs
    27/11/2019 13:10:00 hrs to 27/11/2019 14:40:00 hrs
    27/11/2019 13:25:00 hrs to 27/11/2019 15:15:00 hrs
    29/11/2019 13:40:00 hrs to 29/11/2019 11:55:00 hrs
    29/11/2019 13:55:00 hrs to 29/11/2019 20:35:00 hrs
    30/11/2019 14:10:00 hrs to 30/11/2019 5:15:00 hrs
    1/12/2019 14:25:00 hrs to 1/12/2019 7:05:00 hrs
    4/12/2019 14:40:00 hrs to 4/12/2019 9:55:00 hrs
    5/12/2019 14:55:00 hrs to 5/12/2019 7:25:00 hrs
    5/12/2019 15:10:00 hrs to 5/12/2019 10:00:00 hrs
    5/12/2019 15:25:00 hrs to 5/12/2019 11:15:00 hrs
    5/12/2019 15:40:00 hrs to 5/12/2019 16:15:00 hrs
    18/12/2019 15:55:00 hrs to 18/12/2019 15:55:00 hrs
    18/12/2019 16:10:00 hrs to 18/12/2019 16:10:00 hrs
    18/12/2019 16:25:00 hrs to 18/12/2019 16:25:00 hrs
    18/12/2019 16:40:00 hrs to 18/12/2019 16:40:00 hrs
    18/12/2019 16:55:00 hrs to 18/12/2019 16:55:00 hrs
    18/12/2019 17:05:00 hrs to 18/12/2019 17:10:00 hrs
    18/12/2019 17:20:00 hrs to 18/12/2019 17:25:00 hrs
    18/12/2019 17:35:00 hrs to 18/12/2019 17:40:00 hrs
    18/12/2019 17:50:00 hrs to 18/12/2019 17:55:00 hrs
    18/12/2019 18:05:00 hrs to 18/12/2019 18:10:00 hrs
    18/12/2019 18:20:00 hrs to 18/12/2019 18:25:00 hrs
    18/12/2019 18:30:00 hrs to 18/12/2019 18:30:00 hrs
    18/12/2019 20:15:00 hrs to 19/12/2019 5:35:00 hrs
    26/12/2019 5:35:00 hrs to 26/12/2019 7:10:00 hrs
    26/12/2019 10:50:00 hrs to 26/12/2019 12:10:00 hrs
    26/12/2019 14:55:00 hrs to 26/12/2019 15:40:00 hrs
    27/12/2019 6:25:00 hrs to 27/12/2019 8:55:00 hrs
    27/12/2019 18:25:00 hrs to 27/12/2019 20:20:20 hrs
    3/01/2020 7:05:00 hrs to 3/01/2020 8:30:00 hrs
    4/01/2020 15:10:00 hrs to 4/01/2020 16:20:00 hrs
    4/01/2020 22:00:00 hrs to 5/01/2020 0:00:00 hrs

The number of dispatch intervals that were discarded in the contribution factor calculation process for the sampling period 8th December 2019 to 5th January 2020 due to contingencies that caused the power system frequency to leave the normal operating frequency band are:

Mainland – 302 dispatch intervals
Tasmania – 1312 dispatch intervals

Documentation 2020

2020 Files

Documentation archive

Older archived files

For older documentation please contact the AEMO Information and Support Hub.

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