Business and Government Electricity Pricing

Electricity consumers in Western Australia fall into two categories:

• contestable - can choose electricity retailer; and

• non-contestable - can't choose.

   

Find out which electricity retailers you can use in the Economic Regulation Authority’s guide:

Switched On: Energy Consumers Guide

Non-contestable customers are within the South West Interconnected System. They consume less than or equal to 50 megawatt hours of electricity a year (an average of 137 units per day).

These customers have electricity supplied by Synergy. They pay electricity prices regulated by the Western Australian Government, determined by electricity by-laws.

Residential households and small businesses usually fall within this category.

• Synergy

Contestable customers are within the South West Interconnected System. They consume more than 50 megawatt hours of electricity a year (an average of 137 units per day). These include:  

• small to medium sized businesses; and

• large businesses.

All customers outside the South West Interconnected System are contestable and can choose their retailer. Customers should be aware that Horizon Power is the only retailer in many regional areas.

These customers can negotiate the rates they pay with their chosen retailer.

Customers consuming between 50 and 160 megawatt hours per year can choose to:

• pay the relevant capped tariff offered by Synergy; or

• be supplied by Synergy or another retailer at negotiated prices.

• On-selling of electricity and gas

The Uniform Tariff Policy means that small use Synergy and Horizon Power customers are charged the same rate. This includes customers in remote regions, where costs to supply electricity are higher.

These extra costs are partially funded by the Tariff Equalisation Contribution through electricity network charges in the South West Interconnected System (SWIS). 

All prices below are current as of 1 July 2025

All rates provided are subject to rounding at the fourth decimal place. Please contact Synergy or Horizon Power for the exact rate that applies.