Ancillary services 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 contribution factors determined for market participants, as set out in clause 3.15.6A of the National Electricity Rules and detailed in the following procedure.
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09/02/2023
Regulation FCAS Contribution Factors Procedure v7.0
Effective for contribution factors applicable from 13 August 2023
668.89 KB -
29/04/2024
Regulation FCAS Contribution Factors Procedure v8.0
Effective for contribution factors applicable from 3 June 2024
722.68 KB -
01/07/2010
Efficient Dispatch and Localised Recovery of Regulation Services Business Specification
318.01 KB
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 Services Contribution factors - application period 29 September 2024 to 26 October 2024
The dispatch intervals that were discarded in the contribution factor calculation process for the sampling period 11 August 2024 to 8 September 2024 for reasons other than the effect of contingencies and the data samples where FI and system frequency were mismatched, are listed in Exclusions List (pdf).
The number of dispatch intervals that were discarded in the contribution factor calculation process for the sampling period 11 August 2024 to 8 September 2024 due to contingencies that caused the power system frequency to leave the normal operating frequency band are:
Mainland – 4 dispatch intervals
Tasmania – 602 dispatch intervals
Documentation 2024
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November 2024
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13/09/2024
Settlement Factors 29 September 2024 to 26 October 2024
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13/09/2024
Agg Factors 11 August 2024 to 08 September 2024
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13/09/2024
Exclusions List 11 August 2024 to 08 September 2024
732.54 KB -
13/09/2024
Five Min Factors 11 August 2024 to 8 September 2024
43.38 MB -
13/09/2024
Agg Factors 11 August 2024 to 08 September 2024
45.13 KB
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October 2024
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16/08/2024
Settlement Factors 01 September 2024 to 28 September 2024
124.7 KB -
16/08/2024
Agg Factors 14 July 2024 to 11 August 2024
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16/08/2024
Exclusions List 14 July 2024 to 11 August 2024
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16/08/2024
Five Min Factors 14 July 2024 to 11 August 2024
45.44 MB -
16/08/2024
Agg Factors 14 July 2024 to 11 August 2024
44.86 KB
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September 2024
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19/07/2024
Settlement Factors 04 August 2024 to 31 August 2024
123.93 KB -
19/07/2024
Agg Factors 16 June 2024 to 14 July 2024
609.94 KB -
19/07/2024
Exclusions List 16 June 2024 to 14 July 2024
673.62 KB -
19/07/2024
Five Min Factors 16 June 2024 to 14 July 2024
49.64 MB -
19/07/2024
Agg Factors 16 June 2024 to 14 July 2024
43.5 KB
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August 2024
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21/06/2024
Settlement Factors 7 July 2024 to 3 August 2024
123.88 KB -
21/06/2024
Agg Factors 19 May 2024 to 16 June 2024
43.56 KB -
21/06/2024
Exclusions List 19 May 2024 to 16 June 2024
672.48 KB -
21/06/2024
Five Min Factors 19 May 2024 to 16 June 2024
46.01 MB -
21/06/2024
Agg Factors 19 May 2024 to 16 June 2024
43.56 KB
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July 2024
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24/05/2024
Settlement Factors 09 June 2024 to 06 July 2024
121.43 KB -
24/05/2024
Agg Factors 21 April 2024 to 19 May 2024
42.8 KB -
24/05/2024
Exclusions List 21 April 2024 to 19 May 2024
694.93 KB -
24/05/2024
Five Min Factors 21 April 2024 to 19 May 2024
48.04 MB -
24/05/2024
Agg Factors 21 April 2024 to 19 May 2024
42.8 KB
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June 2024
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26/04/2024
Settlement Factors 12 May 2024 to 08 June 2024
120.73 KB -
26/04/2024
Agg Factors 24 March 2024 to 21 April 2024
605.9 KB -
26/04/2024
Exclusions List 24 March 2024 to 21 April 2024
709.54 KB -
26/04/2024
Five Min Factors 24 March 2024 to 21 April 2024
44.94 MB -
26/04/2024
Agg Factors 24 March 2024 to 21 April 2024
43.17 KB
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May 2024
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27/03/2024
Settlement Factors 14 April 2024 to 11 May 2024
119.09 KB -
27/03/2024
Agg Factors 25 February 2024 to 24 March 2024
606.6 KB -
27/03/2024
Exclusions List 25 February 2024 to 24 March 2024
700.2 KB -
27/03/2024
Five Min Factors 25 February 2024 to 24 March 2024
47.05 MB -
27/03/2024
Agg Factors 25 February 2024 to 24 March 2024
43.65 KB
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April 2024
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01/03/2024
Settlement Factors 17 March 2024 to 13 April 2024
120.12 KB -
01/03/2024
Agg Factors 28 January 2024 to 25 February 2024
606.12 KB -
01/03/2024
Exclusions List 28 January 2024 to 25 February 2024
710.71 KB -
01/03/2024
Five Min Factors 28 January 2024 to 25 February 2024
40.26 MB -
01/03/2024
Agg Factors 28 January 2024 to 25 February 2024
43.2 KB
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March 2024
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02/02/2024
Settlement Factors 18 February 2024 to 16 March 2024
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02/02/2024
Agg Factors 31 December 2023 to 28 January 2024
605.48 KB -
02/02/2024
Exclusions List 31 December 2023 to 28 January 2024
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02/02/2024
Five Min Factors 31 December 2023 to 28 January 2024
36.93 MB -
02/02/2024
Agg Factors 31 December 2023 to 28 January 2024
42.9 KB
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February 2024
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05/01/2024
Settlement Factors 21 January 2024 to 17 February 2024
118.36 KB -
05/01/2024
Agg Factors 03 December 2023 to 31 December 2023
606.21 KB -
05/01/2024
Five Min Factors 3 December 2023 to 31 December 2023
38.8 MB -
05/01/2024
Exclusions List 03 December 2023 to 31 December 2023
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05/01/2024
Agg Factors 03 December 2023 to 31 December 2023 excel
43.08 KB
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January 2024
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08/12/2023
Settlement Factors 24 December 2023 to 20 January 2024
118.85 KB -
08/12/2023
Agg Factors 05 November 2023 to 03 December 2023
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08/12/2023
Five Min Factors 5 November 2023 to 3 December 2023
34.9 MB -
08/12/2023
Exclusions List 05 November 2023 to 03 December 2023
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08/12/2023
Agg Factors 05 November 2023 to 03 December 2023
43.01 KB
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Documentation 2023
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December 2023
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10/11/2023
Settlement Factors 26 November 2023 to 23 December 2023
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10/11/2023
Agg Factors 08 October 2023 to 05 November 2023
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10/11/2023
Exclusions List 08 October 2023 to 05 November 2023
1.7 MB -
10/11/2023
Five Min Factors 8 October 2023 to 5 November 2023
39.46 MB -
10/11/2023
Agg Factors 08 October 2023 to 05 November 2023
42.16 KB
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November 2023
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13/10/2023
Settlement Factors 29 October 2023 to 25 November 2023
120.32 KB -
13/10/2023
Agg Factors 10 September 2023 to 08 October 2023
595.11 KB -
13/10/2023
Exclusions List 10 September 2023 to 08 October 2023
719.82 KB -
13/10/2023
Five Min Factors 10 September 2023 to 8 October 2023
37.83 MB -
13/10/2023
Agg Factors 10 September 2023 to 08 October 2023
42.55 KB
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October 2023
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15/09/2023
Settlement Factors 01 October 2023 to 28 October 2023
120.1 KB -
15/09/2023
Agg Factors 13 August 2023 to 10 September 2023
594.11 KB -
15/09/2023
Exclusions List 13 August 2023 to 10 September 2023
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15/09/2023
Five Min Factors 13 August 2023 to 10 September 2023
34.68 MB -
15/09/2023
Agg Factors 13 August 2023 to 10 September 2023
42.56 KB
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September 2023
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18/08/2023
Settlement Factors 03 September 2023 to 30 September 2023
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18/08/2023
Agg Factors 16 July 2023 to 13 August 2023
593.63 KB -
18/08/2023
Exclusions List 16 July 2023 to 13 August 2023
745.53 KB -
18/08/2023
Five Min Factors 16 July 2023 to 13 August 2023
36.69 MB -
18/08/2023
Agg Factors 16 July 2023 to 13 August 2023
42.77 KB
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August 2023
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21/07/2023
Settlement Factors 06 August 2023 to 02 September 2023
121.92 KB -
21/07/2023
Agg Factors 18 June 2023 to 16 July 2023
589.86 KB -
21/07/2023
Exclusions List 18 June 2023 to 16 July 2023
766.74 KB -
21/07/2023
Five Min Factors 18 June 2023 to 16 July 2023
34.47 MB -
21/07/2023
Agg Factors 18 June 2023 to 16 July 2023
42.21 KB
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July 2023
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23/06/2023
Settlement Factors 09 July 2023 to 05 August 2023
121.64 KB -
23/06/2023
Agg Factors 21 May 2023 to 18 June 2023
587.95 KB -
23/06/2023
Exclusions List 21 May 2023 to 18 June 2023
768.65 KB -
23/06/2023
Five Min Factors 21 May 2023 to 18 June 2023
36.53 MB -
23/06/2023
Agg Factors 21 May 2023 to 18 June 2023
42.3 KB
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June 2023
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26/05/2023
Settlement Factors 11 June 2023 to 8 July 2023
119.66 KB -
26/05/2023
Agg Factors 23 April 2023 to 21 May 2023
586.48 KB -
26/05/2023
Exclusions List 23 April 2023 to 21 May 2023
783.94 KB -
26/05/2023
Five Min Factors 23 April 2023 to 21 May 2023
32.37 MB -
26/05/2023
Agg Factors 23 April 2023 to 21 May 2023
42 KB
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May 2023
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28/04/2023
Settlement Factors 14 May 2023 to 10 June 2023
118.69 KB -
28/04/2023
Agg Factors 26 March 2023 to 23 April 2023
585.11 KB -
28/04/2023
Exclusions List 26 March 2023 to 23 April 2023
799.57 KB -
28/04/2023
Five Min Factors 26 March 2023 to 23 April 2023
31.62 MB -
28/04/2023
Agg Factors 26 March 2023 to 23 April 2023
41.63 KB
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April 2023
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11/04/2023
Settlement Factors 16 April 2023 to 13 May 2023
118.21 KB -
11/04/2023
Agg Factors 26 February 2023 to 26 March 2023
580.05 KB -
11/04/2023
Exclusions List 26 February 2023 to 26 March 2023
773.23 KB -
11/04/2023
Five Min Factors 26 February 2023 to 26 March 2023.
34.29 MB -
11/04/2023
Agg Factors 26 February 2023 to 26 March 2023
41.51 KB
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March 2023
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03/03/2023
Settlement Factors 19 March 2023 to 15 April 2023
117.66 KB -
03/03/2023
Agg Factors 29 January 2023 to 26 February 2023
574.04 KB -
03/03/2023
Exclusions List 29 January 2023 to 26 February 2023
775.95 KB -
03/03/2023
Five Min Factors 29 January 2023 to 26 February 2023
32.88 MB -
03/03/2023
Agg Factors 29 January 2023 to 26 February 2023
40.84 KB
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February 2023
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03/02/2023
Settlement Factors 19 February 2023 to 18 March 2023
115.34 KB -
03/02/2023
Agg Factors 01 January 2023 to 29 January 2023
572.93 KB -
03/02/2023
Agg Factors 01 January 2023 to 29 January 2023
40.69 KB -
03/02/2023
Exclusions List 01 January 2023 to 29 January 2023
785.08 KB -
03/02/2023
Five Min Factors 01 January 2023 to 29 January 2023
34.89 MB
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Late January 2023
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06/01/2023
Settlement Factors 22 January 2023 to 18 February 2023
116.61 KB -
06/01/2023
Agg Factors 04 December 2022 to 01 January 2023
40.74 KB -
06/01/2023
Agg Factors 04 December 2022 to 01 January 2023
572.94 KB -
06/01/2023
Exclusions List 04 December 2022 to 01 January 2023
654.4 KB -
06/01/2023
Five Min Factors 4 December 2022 to 1 January 2023
35.72 MB
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January 2023
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09/12/2022
Settlement Factors 25 December 2022 to 21 January 2023
116.12 KB -
09/12/2022
Agg Factors 06 November 2022 to 04 December 2022
40.44 KB -
09/12/2022
Agg Factors 06 November 2022 to 04 December 2022
566.94 KB -
09/12/2022
Exclusions List 06 November 2022 to 04 December 2022
348.1 KB -
09/12/2022
Five Min Factors 6 November 2022 to 4 December 2022
31.73 MB
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Documentation 2022
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December 2022
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11/11/2022
Settlement Factors 27 November 2022 to 24 December 2022
117.16 KB -
11/11/2022
Agg Factors 09 October 2022 to 06 November 2022
567.25 KB -
11/11/2022
Exclusions List 09 October 2022 to 06 November 2022
472.39 KB -
11/11/2022
Five Min Factors 9 October 2022 to 6 November 2022
42.73 MB -
11/11/2022
Agg Factors 09 October 2022 to 06 November 2022
40.87 KB
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November 2022
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14/10/2022
Settlement Factors 30 October 2022 to 26 November 2022
116.32 KB -
14/10/2022
Agg Factors 11 September 2022 to 9 October 2022
564.81 KB -
14/10/2022
Exclusions List 11 September 2022 to 9 October 2022
536.36 KB -
14/10/2022
Five Min Factors 11 September 2022 to 9 October 2022
40.05 MB -
14/10/2022
Agg Factors 11 September 2022 to 9 October 2022
40.34 KB
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Late October 2022
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October 2022
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September 2022
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August 2022
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July 2022
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June 2022
Please note that the Settlement Factor for Residual Loads has been updated for application period 15 May 2022 to 11 June 2022 to reflect a deregistration of a market participant.
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May 2022
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April 2022
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March 2022
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February 2022
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January 2022
Documentation 2021
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December 2021
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November 2021
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October 2021
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September 2021
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August 2021
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July 2021
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June 2021
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May 2021
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April 2021
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March 2021
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February 2021
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January 2021
Documentation 2020
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December 2020
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November 2020
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October 2020
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September 2020
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August 2020
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July 2020
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June 2020
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May 2020
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April 2020
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March 2020
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February 2020
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January 2020
Documentation archive
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2019
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2018
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2017
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2016
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2015
FCAS Causer Pays Settlement Factors 16 August 2015 to 12 September 2015
30 July 2015 | 125 KB (pdf)Aggregate Factors 28 June 2015 to 26 July 2015
30 July 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 19 July 2015 to 15 August 2015
1 July 2015 | 125 KB (pdf)Aggregate Factors 31 May 2015 to 28 June 2015
1 July 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 21 June 2015 to 18 July 2015
3 June 2015 | 125 KB (pdf)Aggregate Factors 3 May 2015 to 31 May 2015
3 June 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 24 May 2015 to 20 June 2015
7 May 2015 | 125 KB (pdf)Aggregate Factors 5 April 2015 to 3 May 2015
7 May 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 29 March 2015 to 25 April 2015
12 March 2015 | 125 KB (pdf)Aggregate Factors 8 February 2015 to 8 March 2015
12 March 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 1 March 2015 to 28 March 2015
11 February 2015 | 125 KB (pdf)Aggregate Factors 11 January 2015 to 8 February 2015
11 February 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 1 February 2015 to 28 February 2015
14 January 2015 | 125 KB (pdf)Aggregate Factors 14 December 2014 to 11 January 2015
14 January 2015 | 372 KB (pdf)FCAS Causer Pays Settlement Factors 04 January 2015 to 31 January 2015
16 December 2014 | 125 KB (pdf)Aggregate Factors 16 November 2014 to 14 December 2014
16 December 2014 | 372 KB (pdf) -
2014
FCAS Causer Pays Settlement Factors 07 December 2014 to 03 January 2015
19 November 2014 | filesize: 92.2 KB (pdf)Aggregate Factors 19 October 2014 to 16 November 2014
19 November 2014 | filesize: 367 KB (pdf)FCAS Causer Pays Settlement Factors 9 November 2014 to 06 December 2014
23 October 2014 | filesize: 125 KB (pdf)Aggregate Factors 21 September 2014 to 19 October 2014
23 October 2014 | filesize: 371 KB (pdf)FCAS Causer Pays Settlement Factors 12 October 2014 to 08 November 2014
24 September 2014 | filesize: 120 KB (pdf)Aggregate Factors 24 August 2014 to 21 September 2014
24 September 2014 | filesize: 367 KB (pdf)FCAS Causer Pays Settlement Factors 14 September 2014 to 11 October 2014
28 August 2014 | filesize: 120 KB (pdf)Aggregate Factors 27 July 2014 to 24 August 2014
28 August 2014 | filesize: 367 KB (pdf)FCAS Causer Pays Settlement Factors 17 August 2014 to 13 September 2014
29 July 2014 | filesize: 120 KB (pdf)Aggregate Factors 29 June 2014 to 27 July 2014
29 July 2014 | filesize: 367 KB (pdf)FCAS Causer Pays Settlement Factors 20 July 2014 to 16 August 2014
02 July 2014 | filesize: 120 KB (pdf)Aggregate Factors 1 June 2014 to 29 June 2014
02 July 2014 | filesize: 368 KB (pdf)FCAS Causer Pays Settlement Factors 22 June 2014 to 19 July 2014
04 June 2014 | filesize: 120 KB (pdf)Aggregate Factors 4 May 2014 to 1 June 2014
04 June 2014 | filesize: 369 KB (pdf)FCAS Causer Pays Settlement Factors 25 May 2014 to 21 June 2014
07 May 2014 | filesize: 120 KB (pdf)Aggregate Factors 6 April 2014 to 4 May 2014
07 May 2014 | filesize: 396 KB (pdf)FCAS Causer Pays Settlement Factors 27 April 2014 to 24 May 2014
09 Apr 2014 | filesize: 120 KB (pdf)Aggregate Factors 9 March 2014 to 6 Apr 2014
09 Apr 2014 | filesize: 369 KB (pdf)FCAS Causer Pays Settlement Factors 30 March 2014 to 26 April 2014
12 Mar 2014 | filesize: 120 KB (pdf)Aggregate Factors 9 February 2014 to 9 March 2014
12 Mar 2014 | filesize: 369 KB (pdf)FCAS Causer Pays Settlement Factors 2 March 2014 to 29 March 2014
11 Feb 2014 | 94 KB (pdf)Aggregate Factors 12 January 2014 to 9 February 2014
11 Feb 2014 | 280 KB (pdf)FCAS Causer Pays Settlement Factors 2 February 2014 to 1 March 2014
16 Jan 2014 | 94 KB (pdf)Aggregate Factors 15 December 2013 to 2 January 2014
16 Jan 2014 | 280 KB (pdf)FCAS Causer Pays Settlement Factors 5 January 2014 to 1 February 2014
18 Dec 2013 | 90.4 KB (pdf)Aggregate Factors 17 November 2013 to 15 December 2013
18 Dec 2013 | 276 KB (pdf) -
2013
FCAS Causer Pays Settlement Factors 8 December 2013 to 4 January 2014
18 Nov 2013 | 90.4 KB (pdf)Aggregate Factors 20 October 2013 to 17 November 2013
18 Nov 2013 | 276 KB (pdf)FCAS Causer Pays Settlement Factors 10 November 2013 to 7 December 2013
25 Oct 2013 | 90.1 KB (pdf)Aggregate Factors 22 September to 20 October 2013
25 Oct 2013 | 273 KB (pdf)FCAS Causer Pays Settlement Factors 13 October 2013 to 9 November 2013
26 Sep 2013 | 90.1 KB (pdf)Aggregate Factors 25 August to 22 September 2013
26 Sep 2013 | 273 KB (pdf)FCAS Causer Pays Settlement Factors 15 September 2013 to 12 October 2013
28 Aug 2013 | 90.2 KB (pdf)Aggregate Factors 28 July 2013 to 25 August 2013
28 Aug2013 | 275 KB (pdf)FCAS Causer Pays Settlement Factors 18 August 2013 to 14 September 2013
05 Aug 2013 | 90.2 KB (pdf)Aggregate Factors 30 June 2013 to 28 July 2013
05 Aug 2013 | 275 KB (pdf)FCAS Causer Pays Settlement Factors 21 July 2013 to 17 August 2013
05 July 2013 | 90.5 KB (pdf)Aggregate Factors 02 June 2013 to 30 June 2013
05 July 2013 | 278 KB (pdf)FCAS Causer Pays Settlement Factors - 23 June 2013 - 20 July 2013
05 June 2013 | 92 KB (pdf)Aggregate Factors - 5 May 2013 - 02 June 2013
05 June 2013 | 280 KB (pdf)FCAS Causer Pays Settlement Factors - 26 May 2013 - 22 June 2013
10 May 2013 | 91 KB (pdf)Aggregate Factors - 7 April 2013 - 05 May 2013
10 May 2013 | 279 KB (pdf)FCAS Causer Pays Settlement Factors - 28 April 2013 - 25 May 2013
10 Apr 2013 | 132 KB (pdf)Aggregate Factors - 10 March 2013 - 07 April 2013
10 Apr 2013 | 59.6 KB (pdf)FCAS Causer Pays Settlement Factors - 31 March 2013 - 27 April 2013
15 Mar 2013 | 132 KB (pdf)Aggregate Factors - 10 February 2013 - 10 March 2013
15 Mar 2013 | 59.6 KB (pdf)FCAS Causer Pays Settlement Factors - 03 March 2013 - 30 March 2013
14 Feb 2013 | 132 KB (pdf)Aggregate Factors - 13 January 2013 - 10 February 2013
14 Feb 2013 | 59.6 KB (pdf)FCAS Causer Pays Settlement Factors - 3 February 2013 to 2 March 2013
18 Jan 2013 | 91 KB (pdf)Aggregate Factors - 16 December 2012 to 13 January 2013
18 Jan 2013 | 281 KB (pdf)FCAS Causer Pays Settlement Factors - 6 January 2013 to 2 February 2013
18 Dec 2012 | 90.5 KB (pdf)Aggregate Factors - 18 November 2012 to 16 December 2012
18 Dec 2012 | 281 KB (pdf)
Older archived files
For older documentation please contact the AEMO Information and Support Hub.