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.


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 19 April 2020 to 16 May 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 1 March 2020 to 29 March 2020 for reasons other than the effect of contingencies and the data samples where FI and system frequency were mismatched.

  • Mainland excluded dispatch intervals

    2/03/2020 12:00:00 hrs to 2/03/2020 20:05:00
    4/03/2020 17:05:00 hrs to 4/03/2020 19:35:00
    5/03/2020 14:30:00 hrs to 5/03/2020 14:30:00
    9/03/2020 22:50:00 hrs to 9/03/2020 23:35:00
    10/03/2020 7:20:00 hrs to 10/03/2020 11:20:00
    10/03/2020 11:45:00 hrs to 10/03/2020 11:55:00
    10/03/2020 12:25:00 hrs to 10/03/2020 12:45:00
    10/03/2020 12:55:00 hrs to 10/03/2020 13:10:00
    10/03/2020 13:15:00 hrs to 10/03/2020 13:25:00
    15/03/2020 9:55:00 hrs to 15/03/2020 11:25:00
    15/03/2020 15:45:00 hrs to 15/03/2020 16:05:00
    15/03/2020 19:35:00 hrs to 15/03/2020 20:20:00
    15/03/2020 21:15:00 hrs to 15/03/2020 22:00:00
    15/03/2020 20:40:00 hrs to 15/03/2020 21:05:00
    17/03/2020 16:00:00 hrs to 17/03/2020 16:10:00
    18/03/2020 8:10:00 hrs to 18/03/2020 8:10:00
    18/03/2020 11:15:00 hrs to 18/03/2020 11:15:00
    18/03/2020 13:25:00 hrs to 18/03/2020 13:25:00
    18/03/2020 15:05:00 hrs to 18/03/2020 15:05:00
    18/03/2020 15:25:00 hrs to 18/03/2020 15:25:00
    18/03/2020 15:50:00 hrs to 18/03/2020 15:50:00
    19/03/2020 13:15:00 hrs to 19/03/2020 13:25:00
    19/03/2020 13:40:00 hrs to 19/03/2020 13:40:00
    25/03/2020 7:20:00 hrs to 25/03/2020 7:45:00
    28/03/2020 3:00:00 hrs to 28/03/2020 4:05:00

The following dispatch intervals were discarded in the contribution factor calculation process for Tasmania region for the sampling period 1 March 2020 to 29 March 2020 for reasons other than the effect of contingencies and the data samples where FI and system frequency were mismatched.

  • Tasmanian excluded dispatch intervals

    5/03/2020 14:30:00 hrs to 5/03/2020 14:30:00
    19/03/2020 13:15:00 hrs to 19/03/2020 13:25:00
    19/03/2020 13:40:00 hrs to 19/03/2020 13:40:00

The number of dispatch intervals that were discarded in the contribution factor calculation process for the sampling period 1 March 2020 to 29 March 2020 due to contingencies that caused the power system frequency to leave the normal operating frequency band are:

Mainland – 396 dispatch intervals
Tasmania – 999 dispatch intervals

Documentation 2020

Documentation archive

Older archived files

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

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