The problem with our electricity generation and transmission is that the guts of it has been privatised by previous State Governments and the private owners are not likely to keep up R&M/Upgrades because of the Governments' policies of transition to renewables.
This is why, IMO, that the Victorian State Government is on the right track. It has proposed that at least 51% of that state's green energy projects are State Owned and as such State controlled.
With the prospect of EVs increasing the demand on the power grid we simply cant leave it to private enterprise to slve the problem because even Blind Freddy can see that as demand goes up and supply remains static, that the price will go up benefitting the existing fossil fuel privately owned generators.
Lets be real, if you own 3 or 4 coal powered generators are you likely to: (a) do expensive long term R&M/upgrades? (b) increase supply to the grid by building massive solar or wind generators thereby oversupplying the market and knocking the ass out of price?
IMO no. I'd hang in there as I am now and make as much money return on my investment as I can and then scrap the lot.
This is why the provision of power long term has to be a Government issue where the Government owns the major share rather than throwing taxpayers funds at private enterprise in the hope that we wont have another Enron. That's wishful thinking IMO.