Grid project Amsteg – Mettlen

Swissgrid and the SBB are laying the high-voltage lines in the Uri valley floor. This will relieve the burden on the settlement areas in Attinghausen and Werkmatt Uri, which is a focus of development.

Your contact for this grid project

Alessandro Cameroni
Alessandro Cameroni

Phone +41 58 580 21 11
info@swissgrid.ch

380 kV line
380 kV line
Dismantling
Dismantling
Existing line
Existing line
Substation
Substation

Overview

With the exception of the area between Mettlen and Küssnacht am Rigi, two 380 kV lines run in parallel between the Mettlen substation in the Canton of Lucerne and Amsteg in the Canton of Uri. These are the 380 kV Amsteg – Mettlen line (former Alpiq line), which leads on from Amsteg via the Lukmanier Pass to Lavorgo, and the 380 kV Mettlen – Plattischachen line (former CKW line), which runs from Plattischachen as the former Alpiq line via the Gotthard Pass to Airolo.

Former line-owner Alpiq submitted a planning approval application for the total renovation of the 380 kV Amsteg – Mettlen line as a result of the advanced corrosion of the pylons dating from the 1940s. This project was approved in sections and has already been implemented in part. Former line-owner CKW has not published a renovation project for the 380 kV Plattischachen – Mettlen line, which was built in the 1960s. Consequently there is no project for this line.


Project

History

The pylons of the 380 kV line from Mettlen via the Lukmanier Pass to Lavorgo were constructed in the post-war years out of pipes of the allies' former supply pipeline, as a result of the shortage of raw materials. These pipes were filled with concrete to improve stability. Soon after they were erected it became clear that this form of construction tends to corrode from the inside. For that reason at the end of the 1990s Alpiq decided to replace some pylons on the existing route that had been particularly weakened by corrosion. At the end of 2001 Alpiq modified this strategy and submitted a planning approval application for the total renovation of the Ingenbohl – Mettlen section of the 380 kV Amsteg – Mettlen line. The majority of the line has now been renovated. Three sections – Küssnacht am Rigi (SZ), Lauerz (SZ) and Eyschachen (UR) – are still pending in the planning approval process.

As of 3 January 2013 Swissgrid assumed ownership of Switzerland's entire 380/220 kV transmission grid. The former owners – including Alpiq – transferred all existing lines and substations, as well as the projects started at network level 1, to Swissgrid. So since that date the Amsteg – Mettlen and Mettlen – Plattischachen lines have been in the ownership of Swissgrid. Planning, construction and maintenance of all lines and substations are now carried out by a single agency.

Küssnacht am Rigi section

In 2011 the Federal Court ruled that a feasibility study was to be produced for the 380 kV Amsteg – Mettlen line, for partial underground cabling in the municipality of Küssnacht am Rigi. Swissgrid submitted the requested cable study to the Swiss Federal Office of Energy, expressing the opinion that the partial underground cabling – as demanded by the Federal Court – was justifiable neither on the basis of visual effect nor of economy.

Lauerz section

In 2011 the Federal Administrative Court ruled that a feasibility study was to be produced for the 380 kV Amsteg – Mettlen line for partial underground cabling in the municipality of Lauerz. Following the transfer of ownership, Swissgrid took on this task and had the cable study produced.

Following the landslides in the Windegg – Ober Rüti region in 2013, emergency pylons had to be produced for both 380 kV lines. The «Teilverkabelung Lauerz» feasibility study, [Partial underground cabling, Lauerz] which had already been produced, had to be revised. The results of the geological investigations which were carried out by GEOTEST on behalf of the Canton of Schwyz were also taken into account, and the requirements of ESTI relating to the «Erdbebensicherung der elektrischen Energieverteilung in der Schweiz» (Earthquake-proofing of electrical energy distribution in Switzerland), which is to be found in the draft consultation document, were included in the study.

After examining these new basic conditions Swissgrid has come to the conclusion that the subsoil in the landslide-prone region is suitable neither for an overhead line nor for underground cabling, so the «Durchstich Urniberg» (Urniberg transit), which is the subject of the study, is not feasible. The line can no longer follow the existing route and will have to be relocated.

The alternative line route along the lake, also indicated in the cable study, is judged by Swissgrid to be unfeasible for reasons relating to the effects on other infrastructure elements (roads, factory power lines, etc.). The implementation of this line route would result in the considerable obstruction or even total blockage of the main road from Lauerz to Schwyz.

In this section the parallel 380 kV Gotthard line runs on the uphill side. It is exposed to the same risk of landslide and for that reason is to be integrated into the existing project.

Eyschachen near Altdorf section

The 380/220 kV lines (Swissgrid) and the 132 kV of SBB will be bundled in Swissgrid Mast 9429/SBB Mast 60 section in the SABA Attinghausen area up to Swissgrid Mast 9440a/SBB Mast 81 in the Giessenkanal area with a total length of around 4.7 km to form a new route, running parallel with the motorway and the Reuss.

Milestones of the Eyschachen section

Start of 2014 The planning approval application was transferred by the Swiss Federal Inspectorate for Heavy Current Installations (ESTI) to the Swiss Federal Office of Energy (SFOE)
November 2015 The SFOE issued the construction permit
February – June 2017 Tenders
21 August 2017 Ground-breaking ceremony
Spring 2018 Commissioning of new lines

Downloads


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