In this section
This is an archived page
Back to previous page
WEM Rule Changes
The IMO maintains and develops the Market Rules.
All Rule Change Proposals being developed by the IMO can be found here.
All Rule Change Proposals commenced by the IMO can be found here.
All Rule Change Proposals rejected by the IMO can be found here.
All Rule Change Proposals not progressed by the IMO can be found here.
All concept papers considered by the MAC can be found here.
Market Rules Evolution Plan
The Market Rules Evolution Plan reflects the most important evolution issues to be addressed over the coming three years.
Rule Change Process
The Market Rules provide for anyone to propose a Rule Change Proposal by completing a Rule Change Proposal Form or Concept Paper Proposal Form. To facilitate the development of proposals, align similar proposals and enable orderly consideration of proposals, the IMO recommends external parties wishing to propose a rule change to first contact the IMO to discuss the issue to be addressed. These discussions will also assist the proponent to frame the proposal and identify how the rule change will further enable the achievement of the Wholesale Market Objectives.
Usually the Market Advisory Committee (MAC) considers proposals in the early stages (i.e. concept papers and pre-Rule Change Proposals) informally before they are submitted into the formal process.
Once formally submitted, the Rule Change Proposal will be processed according to the process in the Market Rules. A Rule Change Proposal can be processed using either the standard or the fast track process.
The Standard Rule Change Process includes two rounds of consultation and will usually take around 19 weeks. It involves consultation on a draft report published by the IMO prior to the publication of a final report. In consulting on a Rule Change Proposal, the IMO may convene the MAC, meet with interested parties, procure technical advisers, or establish a technical working group drawing on industry representatives if this is considered necessary to appropriately develop or evaluate changes.
The Fast Track Rule Change Process is a shorter process that normally takes around five weeks to complete and is used when the proposed amendments are:
- of a minor or procedural nature;
- required to correct a manifest error;
- urgently required and is essential for the safe, effective and reliable operation of the market or the South West interconnected system (SWIS).
The IMO's decision on whether to accept a Rule Change Proposal, and its reasons, will be published together with a time and date when the accepted Amending Rules will come into force.
If the Rule Change Proposal relates to a Protected Provision (see clause 2.8.13 of the Market Rules), the IMO must seek the Minister for Energy's approval.
Further information is available in the Guideline for Rule Change Proposals and Transitional Arrangements Policy.
Any person may submit a concept paper for consideration by the MAC. The purpose of a concept paper is to foster analysis and discussion of complex issues that can affect the WEM, Market Rules and the Wholesale Market Objectives.
A person wishing to provide a submission to the MAC should contact the IMO to discuss the issue and then submit the completed Concept Paper Proposal Form.
Concept Paper Proposal Form [230kB]
Any person may make a Rule Change Proposal by completing and submitting the Rule Change Proposal Form below.
Rule Change Proposal Form [211kB]
Any Rule Change Proposal must include details as to how the proposed amendments would allow the Market Rules to better address the Wholesale Market Objectives, which are:
- to promote the economically efficient, safe and reliable production and supply of electricity and electricity related services in the South West interconnected system;
- to encourage competition among generators and retailers in the South West interconnected system, including by facilitating efficient entry of new competitors;
- to avoid discrimination in that market against particular energy options and technologies, including sustainable energy options and technologies such as those that make use of renewable resources or that reduce overall greenhouse gas emissions;
- to minimise the long-term cost of electricity supplied to customers from the South West interconnected system; and
- to encourage the taking of measures to manage the amount of electricity used and when it is used.
Any person can make a submission relating to a Rule Change Proposal progressed in accordance with the Market Rules during the period indicated for public submissions. All submissions must reach IMO before 5:00 PM (WST) on the final submission date, unless otherwise noted. A submission must clearly state which Rule Change Proposal is being addressed, using the IMO reference number. Please relate each submission to a single Rule Change Proposal.
The IMO prefers to receive submissions by email to firstname.lastname@example.org using the submission form below.
Rule Change Submission Form [209kB]
This document is published in accordance with clause 10.5.1(a)(v) and (b) of the Market Rules.
All concept papers, pre-Rule Change Proposals, Rule Change Proposals and submissions should be sent to:
Independent Market Operator
PO Box 7096
Cloisters Square, Perth, WA 6850
Phone: (08) 9254 4300
Fax: (08) 9254 4399