The Western Australian Government owns Western Power and Horizon Power, which operate the three major electricity networks.
Western Power’s network
Western Power operates the biggest network in WA – the South West Interconnected System (SWIS). System Management, a separate business unit within Western Power, is responsible for the physical operation of the network to ensure its secure and reliable operation.
Horizon Power’s network
Horizon Power operates: the North West Interconnected System (NWIS) the smaller Esperance network over 30 discrete networks in regional towns and remote communities.
Privately owned networks
Privately owned electricity transmission and distribution networks mainly service mining operations in the Pilbara.
The Economic Regulation Authority regulates third party (retailers and large-scale users) access to WA electricity networks covered by the Electricity Networks Access Code. Currently the only regulated network is Western Power’s SWIS.