In its more than 50 years of history, the El Alto factory has been modernising and adapting its installations to the best available techniques, thanks to significant investments that demonstrate the company’s commitment to ensure that this factory continues to be a fundamental pillar in the economic and social development of the region. Annual cement production is three million tonnes The factory, known as “El Alto”, started its activity in 1972 as an expansion of the existing plant in Vicálvaro, which had been in operation since the beginning of the 20th century and which was supplied with limestone from the quarry located in the municipality of Morata de Tajuña, southeast of the capital. The Vicálvaro factory ceased to operate at the end of the 1990s, and all cement production was transferred to El Alto. In 1972, work was completed on the installation of the factory and clinker production began with just one kiln, the so-called “VI kiln”, continuing the numbering of the Vicálvaro kilns. El Alto has supplied cement and mortar for emblematic projects such as the Royal Collections Museum in Madrid, the Picasso Tower, the airports of Barajas and Ciudad Real, and the Third Millennium Bridge in Zaragoza, among many others. Emblematic projects Between 1990 and 1992, production was expanded with the construction and commissioning of a new grey clinker kiln, “kiln VII”. In the following years of the last century, work continued on the construction of a new coal park, a new white cement line and the extension and modernisation of the grinding and dispatch of cement. Finally, in 2005, a modern dry mortar plant was started up. It currently has quarry facilities capable of processing up to 1,500 tonnes per hour. It has two grey cement production lines, each with a capacity of 3,500 tonnes per day, and one white cement production line with a capacity of 1,000 tonnes per day. It is equipped with specific facilities for grinding and bagging cement, obtaining an annual production capacity of close to three million tonnes of cement, the largest production capacity in Spain.