Germany – Overhead line construction – Netzverstärkung Mecklar - Vieselbach Montage-/Demontageleistungen zur Umbeseilung der 380-kV-Leitung Mecklar – Vieselbach 449/450/454

The AG plans to implement project No. 12 "380 kV High-Voltage Line Vieselbach – Eisenach – Mecklar; three-phase nominal voltage 380 kV" as part of the energy transition and to ensure a secure energy supply in accordance with the Federal Requirements Planning Act (BBPlG). The project is divided into two sections: Section A: UW Vieselbach to the control zone boundary of Thüringen/Hessen (50Hertz), approx. 87 km of existing line. (Scope of this tender!) Section B: Control zone boundary of Thüringen/Hessen to UW Mecklar (TenneT), approx. 43 km of existing line. The aim is to increase the transmission capacity between the substations Vieselbach and Mecklar from 2,520 A to 4,000 A. To this end, the existing 380 kV overhead line 449/450/454 in the area of responsibility of 50Hertz will be upgraded to a current-carrying capacity of 4,000 A by re-conductoring with high-temperature conductor cables (ACPS-HTLS). In addition, identical mast replacements are required. TenneT will carry out corresponding re-conductoring measures on its route section in parallel. The line runs through the Thüringer districts of Wartburgkreis, Gotha, Erfurt, Ilm-Kreis and Weimarer Land. The basis for the re-conductoring and the earth wire/LWL exchange is the prior exchange of a total of 18 masts of the Y/Z/U series. The mast exchange, including the takeover of the existing conductor, is planned to be completed by July 2027 and is not part of this tender. Subject of the tender The tendered assembly services include: - Re-conductoring of the 380 kV overhead line 449/450/454 from mast 134 (state border Thüringen/Hessen) to the UW Vieselbach, including fitting and insulator replacement, - Earth wire exchange for LWL, including fitting replacement, over the entire route length, - individual measures on existing masts, - conversion of the UW Eisenach tap to a temporary spur solution. 380-kV line Mecklar – Vieselbach: The re-conductoring affects the entire route length of approx. 87 km between mast 134 and the UW Vieselbach. In the area from mast 353 to mast 358, a 110 kV overhead line of the TEN is carried on the 380 kV masts of the 50Hertz. This remains unaffected by the re-conductoring. The commissioning of the new ACPS-HTLS conductor cable is planned for December 2029. Conversion of the UW Eisenach tap: Since the UW Eisenach is not designed for a transmission capacity of 4,000 A, the existing tap cannot be retained. Therefore, the erection of a temporary (double) spur solution is planned in the area of masts 175, 176 and 1E. The finalisation of the implementation concept is planned for Q1 2027. The construction implementation is scheduled for Q3/Q4 2028, the connection of the UW Eisenach via the spur solution is planned for Q4 2028. No re-conductoring to ACPS-HTLS conductor cables will be carried out for the tap and the spur solution. Service description assembly: The re-conductoring work is subject to a switching plan that is coordinated with the switching premises of TenneT and the operation of the UW Eisenach. Only single-system switching is available; the other system side remains in operation. The specifications of the master plan (Annex 17) must be observed. The assembly services are divided into four construction lots: - Construction lot 1: Mast 134 to mast 176 including connection to UW Eisenach (approx. 15.2 km) - Construction lot 2: Mast 176 to mast 248 (approx. 28.9 km) - Construction lot 3: Mast 248 to mast 311 (approx. 24.7 km) - Construction lot 4: Mast 311 to UW Vieselbach (approx. 18.1 km) The stringing of the ACPS-HTLS conductor cable is to be carried out preferably as a bundle stringing to avoid different elongation of the sub-conductors. Before mounting the field distance holders, the cable supplier must carry out a core integrity test on each sub-conductor using a trolley. The required equipment will be provided by the cable supplier; the assembly will be carried out by the assembly company according to its instructions. The dismantling of the existing conductor and earth cables is to be carried out in the course of the stringing of the new conductor and LWL cables. The existing cables are to be used as pre-cables in the process. A corresponding risk assessment must be created for work under single-system switching.