Some interesting numbers you've posted there.
According to Google, 1 MTOE is equal to "4.1868x1016 Joules, or 41.868 petajoules".
Again according to Google, one can convert Joules to GWh by dividing by "3.6e+12". So 41.868PJ is equal to 11630GWh.
According to the 2018 South Australia Electricity Report, South Australia's demand for 2017/18 was approximately 12200GWh (taken from graph page 19).
https://www.aemo.com.au/-/media/Files/Electricity/NEM/Planning_and_Forecasting/SA_Advisory/2018/2018-South-Australian-Electricity-Report.pdf
So according to your analysis above, a solar panel array of about 63 square miles would generate all the electrical energy required to meet 2017/18 South Australia's electrical demand.
According to Google again, Adelaide covers an area of 1258 square miles. So an area of 63 square miles represents 5% of Adelaide's apparent size. I wonder how many square miles of appropriately oriented roof there is in Adelaide? I have no idea but I know the roof area of my 60 year old house (not in Adelaide) covers about 20% of the 600sqm block so a quarter of that would make 5%.
If I have my calculations right, this suggests some interesting possibilities as solar technology develops in the future.
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