Contracting Of Detailed Engineering, Provision Of Materials, Construction, Assembly, Calibration, Testing And Commissioning Of Pressure Regulation Stations (Erp). El Colo And Andacollo. Intended For The Contracting Of ¿Detail Engineering, Provision Of Materials, Construction, Assembly, Calibration, Testing And Commissioning Of The Pressure Regulation Stations (Erp) ¿El Colo¿ And ¿Andacollo¿, Intended For The Supply Of Natural Gas To Distribution Networks And/Or Associated Facilities, Under The Regulatory Scope Of Enargas.