Maximum Credit Limit
The National Electricity Rules Clause 3.3.8 requires AEMO to publish the Credit Limit Procedures for the determination of prudential settings for market participants in the National Electricity Market (NEM).
In accordance with the Prudential Standard and Framework which took effect on 1 November 2012, version 3 of the Credit Limit Procedures has been effective from 1 July 2017. It is noted that AEMO will commence operation of the Prudential Margin offsets facility for the 2018 summer season (effective from 30 November 2017).
For further information about the Credit Limit Procedures, please contact AEMO's Information and Support Hub.
Credit limit procedures
Credit Limit Procedures v4
29 January 2018 (369 KB, pdf)
Modelling Parameter and MNSP Prudential Requirement Changes
AEMO has amended key modelling parameters in the CLP to better reflect short to medium term market conditions. These amendments are:
- Changing the weighting factor for average regional price (WP,R) from 10% to 20%.
- Changing the weighting factor for volatility factors (WVF,R) from 10% to 20%.
- Changing the capping factor (for price and volatility factors) from +/-10% to +/-20%.
Additionally, clause 10.3 of the CLP was amended to allow MNSPs to use reallocations, giving MNSPs greater flexibility in meeting their prudential requirements.
The changes are effective from 1 May 2018.
Prudential Margin Offsets
On 22 September 2016, the Australian Energy Market Commission (AEMC) made the National Electricity Amendment (Application of Offsets in the Prudential Margin Calculation) Rule 2016 (PM Offsets Rule).
With effect from 20 October 2017, the PM Offsets Rule gives AEMO the ability to offset trading amounts against reallocation amounts when determining a Market Participant’s prudential margin (PM), as part of its prudential settings in the National Electricity Market (NEM). This would allow the PM for a Market Participant to be reduced if:
- The Market Participant has negative aggregate trading amounts (i.e. net load) and positive aggregate reallocation amounts (i.e. net credit reallocations). The PM would be based on the load offset by the net credit reallocations.
- The Market Participant has negative aggregate reallocation amounts (i.e. net debit reallocations) and positive aggregate trading amounts (i.e. net generation). The PM would be based on the debit reallocations offset by the net generation.
Market Participants can use the ‘Prudential Margin Offset’ menu item, under the Settlements menu item on the AEMO Markets Portal, to opt in/opt out of PM Offsets.
Credit limit procedures effectiveness reports
National Electricity Rules clause 3.3.8(f) requires AEMO to publish a report on the effectiveness of the Credit Limit Procedures developed under the prudential standard framework, at least once a year.
Report on Effectiveness of the NEM Prudential Settings Methodology 2017
31 March 2017 (1.31 MB, pdf)
Report on Effectiveness of Methodology in Credit Limit Procedures 2016
1 March 2016 (842 KB, pdf)
Report on Effectiveness of Methodology in Credit Limit Procedures 2015
2 March 2015 (979 KB, pdf)
Future offsets arrangements
A study on the potential benefits of Futures Offsets Arrangements in the NEM was completed in July 2015 by the AEMO Prudentials team.
Future Offsets Arrangements
18 August 2015 (44 KB, pdf)
Please contact AEMO's Information and Support Hub if you require copies of previous versions or consultations.