Billing and Payments 

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Whilst your gas meter measures gas usage in cubic meters, your usage is actually billed in ‘megajoules’ or ‘units’ on your bill, depending on your state.   To calculate the number of megajoules, you must subtract your meter’s end read from the start read, then multiply by pressure factor and heating value.   For WA, the number of Megajoules is then divided by 3.6 to get to billed units.   A unit of gas is equivalent to 1 kilowatt hour of energy. The pressure and speed of the natural gas delivered to your property will often vary and is based on environmental factors, such as temperature and the appliance that is consuming the gas.
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The supply charge also known as the service charge (or service to property charge), is the charge that applies for supplying electricity to your premises for each day of the billing period, regardless of how much electricity you use. Electricity daily supply charges may vary depending on the electricity network region you are connected and what type of tariff you are on. Supply charges are generally calculated as a contract term amount charged for each day of the time period covered by a bill. They are not related to the amount of energy used during the billing period.   Supply charges cover some of the costs of maintaining and operating the Distribution and Transmission networks (see explanation of   Network Costs), and some of the operational costs of supplying our customers.   To arrive at the supply charge on your bill, we multiply the daily rate by the number of days your energy is supplied.
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Your gas meter shows gas usage in cubic meters whereas usage on your bill is shown in Usage Units.    To determine your gas usage in Units, the following calculation is performed:    Usage units = ((End read - Start read) x Pressure Factor x Heating value)/3.6 = Usage (MJ)   While this is a common formula used to calculate your gas usage in megajoules, it can vary slightly depending on the type of gas meter you have at your property.    The Pressure Factor and Heating Value are used to convert the metered gas volume you have used into an amount of energy calculated in megajoules.    A unit of gas is 3.6 megajoules and is equivalent to 1 kilowatt hour. 
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The best way to view, manage and pay your bills is via My Account, or via the AGL app.  You can also pay using secure online bill payment for credit card, or BPAY if you prefer. 
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