Aprimoramento da metodologia nodal para tarifação do uso de sistemas de transmissão

Abstract

After eight years of the restructuring process, it is possible to analyze the current stage of the Brazilian electrical sector. The way how transmission was structured to introduce competition on the generation and commercialization segments should be reviewed to identify problems and possible solutions. Due to the natural monopoly characteristic of transmission business, it needs to be regulated and the way how rules and tariffs are set is very important for the development of the sector, not only related to the wheeling aspects but the activities associated with generation and consumption. This work draws a diagnosis of the transmission segment focusing on the tariff level evolution and the tariff structure. In the case of tariff level it can be observed that the Transmission Allowed Revenue (TAR) has increased more than the others segments. This is due to the way rules and procedures were designed by the Brazilian regulator. Concerning the tariff structure, it is known that the Investment Cost Related Price method adopted in Brazil has been showing some results that don’t match with the basic assumptions of a cost allocation method. These assumptions are associated with the economic signals for new investments. This work focuses on the main problems and proposes a new structure for the Brazilian power transmission wheeling charges. The tariff will continue to follow the ICRP model but with some adjustments. Instead of using the aggregated form the tariff, it will be compute for each zone or submarket which is set by the transmission network constraints. This drastically reduces the cross-subsidies between the zones that are currently polluted with the postage stamp component.