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WEM Procedures

The WEM Rules require WEM Procedures to be developed and maintained. The WEM Procedures set out the processes required to carry out obligations under the WEM Rules.

The ERA is responsible for maintaining WEM Procedures and a list of materials used for monitoring purposes. Current versions of these documents are available below:

Date Documents
File type
14 Sep 2023 Monitoring Protocol
Adobe PDF 605 kB
1 Sep 2023 ERA triggering the SESSM WEM Procedure
Adobe PDF 206 kB
1 Sep 2023 Portfolio determination WEM Procedure
Adobe PDF 362 kB
9 Nov 2020 Benchmark Reserve Capacity Price
Adobe PDF 284 kB
27 Jul 2020 Types of information provided by AEMO to the ERA for monitoring purposes
Adobe PDF 131 kB


Visit Energy Policy WA for more information on the commencement of the new WEM.

Requesting a Procedure Change

Only the party responsible for a WEM Procedure can initiate the Procedure Chage Process for that procedure. Rule Participants may suggest changes to a WEM Procedure. All suggestions for amendment or replacement of an ERA WEM Procedure should be sent to

Requesting offer construction guidance

Market Participants that have received a notice from the ERA under clauses 2.16C.1(c)(ii) or 2.16C.2(d) of the WEM Rules may, in accordance with clause 2.16D.6 of the WEM Rules, request guidance from the ERA in relation to the Offer Construction Guideline.

For the ERA to consider providing guidance, a request must:

  • be in writing, using the form linked below.
  • identify the matters in the Offer Construction Guideline on which the Market Participant is seeking guidance.
  • specify the Market Participant's reasons for seeking guidance.
  • where relevant, provide supporting materials that illustrate or evidence the matters raised in the request.

A Request offer construction guidance form can be completed and submitted to

The ERA is only required to consider requests for guidance on the Offer Construction Guideline that pertain to WEM Rule 2.16D.5. However, the ERA may consider queries that are not bound by WEM Rule 2.16D.5.

Other WEM Procedures

AEMO's WEM Procedures are available from AEMO's website.

The ERA is required to approve AEMO’s Monitoring and Reporting Protocol WEM Procedure. The ERA published its decision to approve AEMO's protocol on 15 May 2019.

The Coordinator's WEM Procedures are available on their website.

ERA Procedure Change Processes - In Progress

ERA Procedure Change Processes - Complete

Market Surveillance Data Catalogue Requirements List

Clause 2.16.2A of the WEM Rules requires the Economic Regulation Authority (ERA) and the Coordinator of Energy to:

  • develop and provide to AEMO a list of data items that must be included by AEMO in the Market Surveillance Data Catalogue (MSDC requirements list); and
  • publish a list which contains the MSDC requirements list along with a list of WEM Rules that the ERA requires AEMO to monitor for compliance.

Under clause 2.16.2B, AEMO is required to provide the ERA and Coordinator of Energy with access to all data items in the MSDC requirements list.

The initial combined list was provided to AEMO on 19 September 2023.


Date Documents
File type
21 Sep 2023 Market Surveillance Data Catalogue Requirements List (effective 1 October 2023)
Adobe PDF 765 kB
Page last updated: 04 Apr 2024