https://publications.jrc.ec.europa.eu/repository/bitstream/J...
(See page 11)
4000 KMs east to west is about 2.4 hours offset geographically. Would it be cheaper to have 2.4 hours of storage closer to the east coast of Australia, with solar farms close to the consumption? Or would building a 4000km HVAC transmission line from the west coast of Australia to the east coast be cheaper? I'd imagine there would be a tipping point where one option is more economical than the other.
Personally, I'd like to see WA's electricity network connected through to SA, and connect SA's through to NSW, but I also like the idea of many independent microgrids for the resilancy they'd offer.
Distributed independent microgrids with interconnects fed by a range of power generation methods and size the generation at >1.5x power needs. Refurbish and maintain fossil fuel to fill when needed, and ideally make them as modular as possible with turbine halls being convertable between different fuel types.