Scott Morrison said it would be about as useful for the electricity system as the Big Banana at Coffs Harbour or the Big Prawn at Ballina in NSW.
Key points

South Australia’s Tesla battery was initially dismissed by critics
Market operator finds the battery dispatches power faster than conventional stations and pushes down prices
Energy analyst says the battery has helped shore up the entire energy grid

via Tesla battery proves a leading source of dispatchable power, AEMO says – ABC News (Australian Broadcasting Corporation)