AEPC_2024_13 Dispatch Algorithm Formulation

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: 31 October 2024

Matter under Consultation

AEMO has commenced the Procedure Change Process to propose amendments to the Dispatch Algorithm Formulation WEM Procedure as a result of the Frequency Co-optimised Essential System Services (FCESS) Cost Review Amending Rules.

Energy Policy WA has published the FCESS Cost Review Amending Rules, which seek to reduce costs incurred in the FCESS market. These Amending Rules are intended to reduce FCESS costs that have increased under the Security Constrained Economic Dispatch market, in comparison to similar services in the Balancing Market, prior to 1 October 2023.

Amendments as a result of the FCESS Cost Review Amending Rules include:

• Various amendments to outline how the updated tiebreak process is represented in the Dispatch Algorithm.
• Amendments to Table 5 to include two new tiebreak Constraint Violation Quantity variables.
• A new Appendix G, to outline the process for determining Facility Tiebreak Numbers and the priority order to give effect to the new tiebreaking rules.

AEMO considers that the proposed amendments to the Procedure will ensure consistency with the Amending Rules. AEMO have also taken the opportunity to make the following minor amendments:

• Minor wording amendments throughout the WEM Procedure to improve clarity.
• Separating Active Fast Start Facilities with a Fast Start Target Mode of 0 to 4 in optimisation problems to better reflect the operating behaviour of these Facilities.Replacing “Alternative Maximum STEM Price” with “Energy Offer Price Ceiling”, following removal of the concept from the WEM Rules.

Invitation to Make Submissions

AEMO invites written submissions on this Procedure Change Proposal, including any alternative or additional proposals you consider may 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).

Please identify any parts of your submission that you wish to remain confidential, and explain why. AEMO may still publish that information if it does not consider it to be confidential, but will consult with you before doing so.

Meetings

Before the closing date for submissions, you may request a meeting with AEMO to discuss the issues and proposed changes raised in the Procedure Change Proposal, stating why you consider a meeting is necessary or desirable.

If appropriate, meetings may be held jointly with other stakeholders. Subject to confidentiality restrictions, AEMO will generally make details of matters discussed at a meeting available to other stakeholders, and may publish those details.

Closing Date and Time

Stakeholders were advised that  submissions in response to this Procedure Change Proposal should be sent by email to WA.Marketdevelopment@aemo.com.au,to reach AEMO by 5.00 pm (AWST) on 28 November 2024.

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

AEMO is not obliged to consider submissions received after the closing date and time. Any late submissions should explain the reason for delay and the detriment to you if AEMO does not consider your submission.

Publication

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