The 900-kilometre line will run from Robertstown, in SA’s mid-north, through Buronga to Wagga Wagga with the Robertstown sub-station to upgraded and a new one built at Bundey.
Another transmission line will be built between Buronga and Red Cliffs in Victoria.
The interconnector is forecast to cut power bills in SA by about $100 a year for the average household.
Before Monday’s final commitment, the Australian Energy Regulator had approved the expenditure required for the project.
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