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This and the generation activities are regulated by the federal government, known as Granting Power(Poder Concedente), since they involve a public service.Essentially, it is possible to affirm that the transmission facilities are those that are designed to formthe basic network of the interconnected systems, whose voltage is above 230 kV, usually connectingfree consumers, generators and distributors.These definitions are relevant, since only the transmission facilities that make up the basic network ofinterconnected electric systems are the object of a concession, granted through an invitation to bid.High voltage transmission facilities (below 230kW) are considered subtransmission facilities that forman integral part of the distribution concession. And the transmission facilities of the restricted interestof generating centers are considered component elements of the respective concessions, licenses orauthorizations, e.g. subtransmission lines intended solely for the use of independent production.With the increase in the number of generation plants in various regions of the country – e.g. theconstruction of large hydroelectric power plants such as Belo Monte, Jirau, Santo Antônio, Teles Pires(all located in the North of Brazil) and the wind farms mentioned above – the tendency is for thenumber of transmission lines put up for bid by ANEEL to grow, so as to guarantee the transportation ofpower and avoid power transmission "bottlenecks", which will result in the increase of investments inthis segment.It is relevant to mention, also, that those who wish to connect to the transmission system must sign atransmission system use agreement (Contrato de Uso do Sistema de Transmissão – CUST)regulating the rights and obligations of the system users, and a transmission system connectionagreement (Contrato de Conexão ao Sistema de Transmissão – CCT) regulating the technical issuesrelated to the connection point and maintenance thereof. The revenues of transmissionconcessionaires come from payments of the tariff for the use of the transmission system (Tarifa deUso do Sistema de Transmissão – TUST), and concessions are subject to readjustment and tariffreviews.11.3.3. DistributionTransmission lines transport high-voltage electricity to substations, where power is reduced to lowervoltages and then delivered to end consumers through distribution lines. Therefore, the owners of theutility poles and power networks located in the cities are the electric power distributors. They are alsothe ones that have a direct relationship with end consumers.The provision of public electric power distribution service depends on the granting of a concession bythe federal government, acting as the Granting Power. Electric power distributors must provide free75