Electricity Accounts

Here is an electricity account of a house holder in Geelong who has a solar panel on her roof!.

Now look at this account.  What is strange about both of these accounts?

Create a spreadsheet that would mimic this account! You must use use calculations to complete your version The spreadsheet must show at least one calculation of the type "=Previous_Balance + and  some other named cells" ( Look at this example if you are stuck! )
Here is a sample of a completed spreadsheet that uses the data from this account.