New South Wales Consolidated Regulations

GAS SUPPLY (NATURAL GAS RETAIL COMPETITION) REGULATION 2001 - REG 35

35 Calculation of charges if increase in rates of charges occurs

(1) If a bill is issued for a billing period under a customer supply contract with a small retail customer in which there is an increase in the rates of charges for gas supplied, the charge for gas supplied during the period is to be calculated using the following methodology, or an equivalent methodology:

(a) the gas supplied for the whole period is to be charged for at the rate applicable at the end of the period, and

(b) for each variation that occurred during that period, an adjustment component (calculated for that part of the period occurring prior to the variation) is to be deducted from the charge so calculated.

(2) For this purpose, the adjustment component is to be calculated in accordance with the following formula:

"A" is the adjustment component.
"d" is the number of days in the billing period during which gas was supplied:

(i) in the case of the first or only variation, before the variation took effect, or

(ii) in the case of a second or subsequent variation, after the previous variation took effect and before the second or subsequent variation took effect.

"n" is the number of days in the billing period during which gas was supplied.
"N" is the amount of the charge for the whole of the billing period, calculated at the rate applicable at the end of the period.
"C" is the amount of the charge for the whole of the billing period, calculated:

(i) in the case of the first or only variation, at the rate applicable immediately before the variation took effect, or

(ii) in the case of a second or subsequent variation, at the rate applicable immediately before the second or subsequent variation took effect.