[3] The 2016 upgrade included a new substation named Black Range at Willalooka (halfway between the South East and Tailem Bend substations) with series compensation to improve transmission efficiency.

[2] When the Heywood interconnector was built in 1988, the primary purpose was to move cheaper coal-powered electricity from Victoria to South Australia.

In later years, it has been used to an increasing degree to transport wind-powered electricity from South Australia to Victoria.

[4] The Heywood interconnector became overloaded, as the missing generation was automatically drawn from Victoria.

The tripping of the interconnector lead to an islanding of the SA power system, which fell into a rapid frequency decline.