Revenues from energy sales and transmission and energy related activities
Sales to large-volume consumers are billed monthly based on meter readings. Billing for sales to retail consumers is based on meter readings taken throughout the year. The amount of energy and transmission services supplied to retail consumers during the reporting period and the resulting revenues are, therefore, estimated in part on the basis of historical consumption information, standard customer profiles and applicable energy tariffs.
The geographical breakdown of revenues is presented in the segment information.