In that case we really need good applications to take advantage of surplus energy beyond energy storage.
- synthesising hydrocarbon fuels for use where batteries are not practical e.g. long-haul shipping and aviation
- desalinating water (plenty of need for more fresh water around the world)
- scrubbing excess CO2 from the atmosphere
Still impressive though.
As for the other 23%, according to Wikipedia [1], South Australia has 2 operating solar farms (338 MW installed capacity), which take up 1000 hectares, so 10 km² (which is about 0.001% of the State's land area). SA also has about 2 GW of wind power.
1. https://en.wikipedia.org/wiki/List_of_solar_farms_in_South_A... — Data is for 2019. May be higher now.