Wholesale Electricity Market

The Wholesale Electricity Market supplies electricity to more than a million households and businesses in the State's south-west via the South West Interconnected System (SWIS).
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The Wholesale Electricity Market in Western Australia commenced in September 2006. It is established under the Electricity Industry (Electricity System and Market) Regulations 2004 and is governed by the Electricity System and Market Rules. 

The boxes below provide further information about the Wholesale Electricity Market (WEM), including its various legal instruments and the Market Advisory Committee. Information on how to make a Rule Change Proposal is provided on the section titled Market Development.

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ESM Rules

The Electricity System and Market (ESM) Rules provide for the operation of the power system and establish the market for the wholesale supply of electricity in the South West Interconnected System.
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ESM Rule Change Proposals

A complete list of Rule Change Proposals currently under consideration and all past Proposals.
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Market Advisory Committee

The Market Advisory Committee provides advice to the Coordinator of Energy on Rule Change Proposals and the evolution of the Wholesale Electricity Market.
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WEM Procedures and Coordinator Guidelines

The Coordinator of Energy is responsible for the development and maintenance of several procedures under the Electricity System and Market (ESM) Rules.
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WEM Operation Effectiveness Report

The Coordinator of Energy is required to provide the Minister for Energy with a report on the operational effectiveness of the WEM at least once every three years.
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WEM Procedure Changes

The process for the Coordinator of Energy, AEMO, the ERA and Western Power to amend WEM Procedures.
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Market Development

Information on how to submit a Rule Change Proposal, as well as other documents relevant to the evolution of the Wholesale Electricity Market.
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New Market Implementation

Information relevant to the new Wholesale Electricity Market, that commenced in October 2023.

Coordinator of Energy's Cost

Coordinator of Energy identified budgets.

Coordinator Determinations

Determinations made by the Coordinator of Energy.

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