Installing a battery in South Australia did not lead to to a quadrupling of national energy prices. The cost of energy globally has shot up since 2020, and Australia's spot prices are based on the global market.
Energy independence in the form of renewables is now more advantageous than ever. Tethering your economy to global price hikes like this is a vulnerable position to be in.
Australia's spot prices aren't based on the global market.
They are based on the (Australian) national energy market (NEM) which sets price based on supply and demand across South Eastern Australia (WA and NT aren't in the NEM)
https://fred.stlouisfed.org/series/PNRGINDEXM
Energy independence in the form of renewables is now more advantageous than ever. Tethering your economy to global price hikes like this is a vulnerable position to be in.