ElectraNet has confirmed that this is an issue with its high voltage transmission lines.

Update 3.30pm

SA Power Networks has been advised by ElectraNet, that the fault at its Hummocks substation, was the result of insulator pollution – an issue which has also been impacting the local distribution network for several weeks but has now extended to the ElectraNet’s transmission network.

Read the Media Release with full update

Update 8.00am

ElectraNet suspects that insulator pollution is a contributing factor to this outage and is working to resolve the issue.

We are in close communication with ElectraNet and we will continue to provide updates as we receive them.

Please be aware, insulator pollution is affecting all powerlines at the moment due to the ongoing dry conditions. While the initial cause of this outage is with the transmission network, once transmission is restored, our SA Power Networks distribution network may experience some flow-on issues. We will be ready to address these as quickly as possible, but we won't know the extent of these issues until ElectraNet restores transmission.

Read more about outages caused by insulator pollution.