Vattenfall is operating the DanTysk and Sandbank offshore windfarm. DanTysk (DT) and Sandbank (SB) Offshore Wind Farms, henceforth referred to as DTSB, are two offshore windfarms located in the German Bight, within the German Exclusive Economic Zone (EEZ), close to the German-Danish border. This tender procedure consists in the delivery of Annual High Voltage services and correctives of the electrical equipment of the WTGs for the offshore windfarms DanTysk and Sandbank under the responsibility of the supplier. More details will be provided in the ITT & PQQ instruction guides (each in separate phases).