Switzerland – Works for complete or part construction and civil engineering work

The project consists of the construction of three new phase shifter transformers (PSTs) at the Riddes substation. Although the addition of a PST is optional, the necessary infrastructure for the three new PSTs has already been approved and is included in this tender. The project includes the following activities: * Demolition of old underground reinforced concrete foundations corresponding to an older station configuration. * Rehabilitation of existing reinforced concrete foundations in poor condition. * Construction of three new PSTs and the associated operational buildings. * Manufacturing of new AIS equipment required for future site operation. * Extension of the existing GIS service building. * Supply, installation, and commissioning of all SAS equipment required for the station's refurbishment. * The supply, assembly, and commissioning of the station's internal services. * The adaptation of the underground network, drainage system, sewage and wastewater system, and external facilities to integrate the building project into the existing environment. The following work must be carried out within the scope of this tender for the construction of the new 220 kV building: * Site setup, including fencing and safety measures, access gates, and construction access roads. * Demolition of existing underground structures. * Excavation, concrete, and finishing work. * Excavation and civil engineering work. * Supply and installation of the system grounding. The detailed components of the services are listed in document C100.