For so long, the pounding sunshine of an Australian heatwave was the grid's biggest threat. It has now become its greatest asset.

"…Combined with wind and hydropower, solar met as much as 76.6 per cent of demand on the day.

Almost half of all supply over the 24 hours came from renewable sources.

It’s a far cry from just seven years ago, when renewable energy at no stage provided more than 26 per cent of supply during a separate heatwave."