The amount of electricity consumed is generally stated on the second page of your electricity bill and usually has a title along the lines of "Total KWh used" for the billing period.
As most business usage varies throughout the year, you will need to gather all the bills for a year and add the numbers together. If.your business has multiple sites with separate billing, it will be necessary to add all the bills together to determine the annual use.
How do l calculate my MWh usage?
There are 1000 KWh in one MWh, so to identify the MWh usage, you need to divide the total KWh by 1000.
Please refer to the following examples to assist with reading your electricity bill:
http://agl.com.au/home/billing-and-payments/Bill%20Explainers/your-bill.html
http://www.originenergy.com.au/files/Understand_your_bill_green_2600.pdf