The Tucuruí transmission line (Portuguese: Linhão de Tucuruí) is a hydroelectric power line that leads north from the Tucuruí Dam in Pará, Brazil and crosses the Amazon River.From there the eastern branch leads to Macapá in Amapá and the western branch leads to Manaus in Amazonas.The towers supporting the span across the Amazon River are nearly as high as the Eiffel Tower.Work to extend the line from Manaus north to Boa Vista, Roraima, is due to complete in 2018. There were delays in issuing the environmental permits and then legal challenges since the line crosses the territory of indigenous people who had not been consulted.Although efforts have been made to avoid environmental damage, there has been controversy about the impact of construction and of the tower maintenance corridor.