Ever since Kennett privatised the lot, successive Victorian Premiers seem to have believed that they had no obligation to ensure adequate power supplies available to meet the inevitable growing demand.It's a combination of privatised power gouging a captive market and the complete mess that 'green' energy sources have been making of the grid and the concept of reliable supply.
I think Brenton has every right to be furious - I felt exactly the same way after the blackout we had here in 2016 that was exclusively due to overloaded wind farms although they did everything they could to try and bury that cause. Now the poor long-suffering grid captive South Australian residents such as myself have to pay $1,600,000,000 to build yet another transmission line to NSW in order to try and shore up our capacity during times that our rubbish wind-towers and solar inputs can't meet demand or are knocked out of action and so we don't need the $300,000,000 worth of diesel generators that Weatherill bought to back-up the grid any more.
NONE of this would have happened if South Australia's only coal-fired power plant - Playford at Port Augusta - was still supplying us with cheap and reliable power. Honestly, who on earth would want to be running a business in South Australia OR Victoria - we have between us the highest domestic electricity charges in the world and we can't even manage to keep the lights on all the time.
AEMO report that overall reliability of power supply to the grid in Australia - note, not power supply to consumers - was 99.8% over the last 2 years and in SA it was 100%. The overwhelming issue re power interruptions to customers is network outages.
My understanding re the 2016 blackout in SA was the initial failure of the main transmission towers. This immediately lead to a situation where a) more wind turbines were called upon to supply the shortfall and simultaneously b) the % of power required from frequency stable sources dropped below the critical level. The way the grid was set up at that stage required the wind turbines to be immediately taken out of the supply side. Hence the black out.
The solution was to construct and commission the battery in the mid north. This can supply frequency stabilisation in nano seconds (cf up to minutes under the old system) and has saved consumers many millions of $ since commencing operation. In addition, my understanding is that measures have now been (are being) taken to ensure more wind turbines can supply frequency compliant power.
BTW, SA is a net exporter of power, mainly but not only, to NSW. It also has the lowest power generating costs, excluding gas.
With a national grid, it is to a large extent irrelevant where power is being produced, as long as the distribution grid is reliable