AEPC_2024_20 Credible Contingency Events

The Consultation Process

The consultation process is outlined below. Dates are indicative only and subject to change.

Procedure Change Proposal

Wholesale Electricity Market Rules – Clause 2.10

Date of Notice: 13 December 2024

Matter under Consultation

AEMO initiated this Procedure Change Proposal to amend the WEM Procedure: Credible Contingency Events to clarify elements of the Procedure and improve alignment with the WEM Rules. The proposed amendments included:

• Clarifying the application of the Credible Contingency Event framework for the potential loss of a node created by a substation busbar.
• Redrafting provisions to better align with the WEM Rules, including the description of Credible Contingency Events under clause 3.8A.2 and Non-Credible Contingency Events under clause 3.8A.3.
• Undertaking minor editorial and typographical changes to improve readability and clarity, including new definitions for specific Power System Elements, redrafting provisions relating to information requests, and updating parts of Appendix B.
• Moving the Procedure to the updated AEMO WEM Procedure template.

Invitation to Make Submissions

AEMO invited written submissions on the Procedure Change Proposal, including any alternative or additional proposals to improve the procedure or better meet the Wholesale Market Objectives in section 122(2) of the Electricity Industry Act 2004 (and clause 1.2.1 of the WEM Rules).

On 6 February 2025, the State Electricity Objective (SEO) replaced the Wholesale Market Objectives.  Following an assessment, AEMO considers the revised Procedure is consistent with the SEO.

Respondents were asked to identify any parts of their submissions that they wished to remain confidential, and explain why. AEMO noted that it, following consultation with a respondent, may still publish that information if it does not consider it to be confidential.

When making a claim for confidentiality, AEMO encouraged respondents to familiarise themselves with Chapter 10 of the Wholesale Electricity Market Rules, which imposes obligations in respect to the release of documents.

Meetings

Before the closing date for submissions, stakeholders were advised that they may request a meeting with AEMO to discuss the issues and proposed changes raised in the Procedure Change Proposal, stating why they considered a meeting was necessary or desirable.

AEMO met with Western Power on 14 January 2025 at Western Power’s request to discuss the proposed changes to the WEM Procedure. Western Power’s formal submission is consistent with feedback provided verbally in the meeting.

Closing Date and Time

Stakeholders were advised that submissions in response to this Procedure Change Proposal were to be sent by email to WA.Marketdevelopment@aemo.com.au, to reach AEMO by 5.00 pm (AWST) on 24 January 2025.

All submissions were required to be in electronic format (pdf or Microsoft Word). Submissions were encouraged to use the Procedure Change Submission form available on this page.

AEMO was not obliged to consider submissions received after the closing date and time. Any late submissions were required to explain the reason for delay and the detriment to the respondent if AEMO does not consider the submission.

Publication

All submissions are published on AEMO’s website. Confidential information is not published, other than as specified above.