Power station of the Navallar.
The Navallar Power Plant was inaugurated in 1900. Being the first to supply hydroelectric power to Madrid, Spain. Together with the dam of Santillana Reservoir, the base for supplying electricity to Colmenar Viejo (the street lighting was inaugurated in Colmenar on November 7, 1901). It is supplied with a waterfall of about 100 meters fed by a pipe (initially formed by 4 tubes) of 8 km in length whose origin is in the dam of the Santillana reservoir. The "Comprehensive Plan for Harnessing the Hydroelectric Resource" of the Canal de Isabel II began in 1989 with the modernization of this plant, which currently continues to provide service.
Its inauguration in 1900 meant the abandonment of the mills and batanes that were along the river bed, since this plant allowed the installation of electric mills that could be built far from the river and closer to the nuclei of population.
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