AEMO ELECTRICITY MARKET NOTICE
The Tungkillo - Tailem Bend 275kV line in South Australia (SA) region is planned to be out of service from 0900 hrs on 16/04/2019 to 1800 hrs on 16/04/2019.
During this outage, SA will remain connected to the rest of the NEM via the Tailem Bend - Cherry Garden 275kV line and the 132kV network.
A credible contingency event on the Tailem Bend - Cherry Garden 275 kV line during this planned outage will sever the 275kV connections between the NEM and SA. If SA remains connected to the NEM via the 132kV network, this will pose a system security issue.
If this occurs, AEMO will take all necessary steps as outlined in Section 6.1 of SO-OP-3715 Power System Security Guideline to separate the 132kV network and therefore manage an orderly separation of SA from the NEM.