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Do you have a meter to monitor how much electricity you are consuming?
I don't get what you are trying to achieve here? Prepaid meters are pretty tamper proof so you can't interface with it directly to automatically create a spreadsheet for you.
As Vegeta says, you have to manually record the KW values every day and physically enter them into a spreadsheet. Then just apply you local tariff to get the rand value.
lol lazy little bugger you! Copy my text into excel and then just add the + - formulas
Heres an excel sheet I use https://mega.co.nz/#!PkNmzKiA!-zm2-dK6vm6h_jIw4K40Rp6FeBfVAyXkn9etJ6eruhI