IIANM, the high cost of electricity was what led them to bring Musk in, not the other way around.
I know there's a north-south fight over natural gas there because of scarcity and regional squabbling.
Can you please relay the source for that statement?
I happen to have a brother in the energy industry who for the past 25 years has been living in Adelaide as my source.
I have not found any places in the world where renewables or electric schemes like this have proven to lower the cost of electricity. It is the other way around. See this article on the ongoing fantasy of converting to renewable power this decade.
Renewable energy target of 50pc reached early in South Australia
Updated 9 Apr 2017, 7:09pm
Renewable energy production in South Australia has hit the state's target almost eight years ahead of schedule.
The Government's target is for 50 per cent of the state's energy to be supplied from renewable sources by 2025, and in the past year it has been reported 53 per cent of its energy has come from sun and wind-based sources.
South Australian Energy Minister Tom Koutsantonis described the increase as a "good thing" while also attacking the Opposition, claiming they do not have an energy policy.
"I am very pleased with those results. I am pleased that South Australia is leading the nation," Mr Koutsantonis said.
http://www.abc.net.au/news/2017-04-10/south-australia-renewable-energy-target-reached-early/8429722
And South Australia is blessed with a lot of hydrocarbon wealth due to the proximity of the Cooper basin for oil and gas and coal mining.

Unsure what you mean a 'north-south fight over natural gas there because of scarcity and regional squabbling'. Are you referring to within South Australia or between states in Australia?
Australia is blessed with a super-abundancy of hydrocarbons in the form of natural gas and liquids, as well as coal and coal-seam gas. The states in Australia are much more autonomous than here in the US and do not agree between themselves very much so abilities to have 'national' grids or pipelines are not common.
Perhaps that is what you are referring to?