Every month, every customer in the domestic category is allowed 15 units of power at the lifeline (subsidized) tariff of Ush 250 per Unit (kWh). Besides, every customer is required to pay a monthly standing charge of Ush 3,360. Therefore, the first time a customer purchases electricity units in a month, the customer receives subsidized units but also a deduction is made for the monthly standing charge. However, if a customer makes further purchases before the same month ends, the customer will buy units at the normal tariff (non-subsidized and also with no other charges except VAT). Therefore, the major reason why kWh units vary between the first purchase in a month, and subsequent purchases is the lower cost of the first 15 units and the monthly standing charge.