Ill put this here first.. the file or Spreadsheet xlsm has macros enabled, this is so its automatic, if you don't enable macros on the warning when first opened it wont work, If someone knows a work around in formatting this sheet and can edit it without macros PLEASE contact me as I would love the help to do so...  the other file xlsx is normal spreadsheet and macros DO NOT WORK but is set to this financial year.

Just download the ZIP file to your laptop or PC.. YEAH I KNOW... Why a ZIP file?? well the file inside the ZIP is a Excel spreadsheet .xlsm (not a .xls or .xlsx file )  that's a spreadsheet with macro's so you can simply press a button on the sheet and it will change data from one Financial year to the next and the next, making it very easy to edit and use just fill in the yellow boxes, to compare each year POWER prices. I don't like using zip but i have no other option just yet for that i apologize - jump online download your past bills or check your email for old bills to see how it compares, - its accurate to about 2cents!! Your welcome.. 
put in your last bill date, go out and read your meter and put the figures into the spreadsheet second yellow column and any credits you have from previous month or if you have a debit put s -$ minus in the dollar figure to tell the SS that you still owe money -  if appliable.
    
Using the codes on the other page (normally at the bottom page tabs) second page of the spreadsheet read your meter to get the KWH for your,  tariff 11 (code 15) tariff 33 (code 21) and if you have Solar export is code 4 or 04 - these codes are for the Yurika S1325 meter.
fill in ALL the yellow sections and any credit or debit from your last bill so the sheet knows how to handle your data remember credit use a + in front of your number or a - if you still owe money from prev bill like -135 for - $135 dollars +155 for $155 you have in credit. if you have a different meter send me a pic of it via email and ill try work out the codes to read the KWH of each tariff.
any issues or suggestion's please pm me or email peterparkinson1966@gmail.com