Paragraph 4

For each combination of fuel type, payment method and month—

(a)

the total annual cost of fuel for a discounted tariff customer (“D”), and

(b)

the total annual cost of fuel for a customer paying a reference tariff (“R”),

on the assumptions that (in each case)—

(i)

the customer’s rate of consumption of each fuel supplied to that customer is the mean rate of consumption of all the supplier’s discounted tariff customers;

(ii)

the customer remains on that tariff for a year;

(iii)

the price of the tariff on the last day of that month remains unchanged for that year; and

(iv)

if the supplier charges different prices in different regions for the tariff, the price paid by the customer is the mean of the prices charged in each region in which the supplier has customers on that tariff.