The Navalcarnero Plant Joint Venture was created in the summer of 2005 with the aim of exploiting the Navalcarnero Construction and Demolition Waste Comprehensive Treatment Complex. It is made up of five companies: Macotran SL, Contrasa, Contenedores Extramadrid SA, and Etrecsa that carry out their activity in the construction waste transport sector and Daorje SA, the construction company of the Navalcarnero Plant. The aim of this union is to combine the experience in the operation of the waste treatment plants provided by Daorje SA Environmental Division, with the extensive experience in the waste transport sector provided by the other four companies.