Connection Nant de Drance

Several 380 kilovolt overhead lines and underground cables between Nant de Drance and the Rhone plain near Martigny are required to connect the Nant de Drance pumped storage power plant. Without these connections, the energy of around 1 gigawatt cannot be fully transported

Your contact for this grid project

Marie-Claude Debons
Marie-Claude Debons

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

380 kV line
380 kV line
380 kV underground cabling
380 kV underground cabling
220 kV line
220 kV line
220 kV underground cabling
220 kV underground cabling
SBB line
SBB line
SBB underground cabling
SBB underground cabling
Dismantling
Dismantling
Existing line
Existing line
Substation
Substation

Overview

As part of this connection project, the pumped-storage power plant at Nant de Drance will be connected to the extra high voltage network. Connection to the power plant entails three projects:

Le Verney – La Bâtiaz

Construction of a new 2 x 380 kV cable line to replace the existing 220 kV line that runs through the Rhone Valley for a distance of 1.3 km.

La Bâtiaz – Châtelard

Construction of a new 12.5 km 2 x 380 kV line to replace the 220 kV line.

Châtelard – Nant de Drance

Construction of a new 6.5 km 2 x 380 kV cable line in the cave in order to connect the power plant at Nant de Drance with the Châtelard substation.

Substations

The project consists of three substations: the substation at Nant de Drance (380 kV) located in the cave, the substation at Châtelard equipped with a 380/220 kV transformer, and the substation at La Bâtiaz. The existing La Bâtiaz station will increase from 220 kV to 380 kV.

1/20: Construction Nant de Drance June / July 2015
2/20: Construction Nant de Drance June / July 2015
3/20: Construction Nant de Drance September 2015
4/20: Construction Nant de Drance October 2015
5/20: Construction Nant de Drance October 2015
6/20: Construction Nant de Drance October 2015
7/20: Construction Nant de Drance October 2015
8/20: Production of the pylons January / February 2016
9/20: Production of the pylons January / February 2016
10/20: Construction Nant de Drance March 2016
11/20: Construction Nant de Drance April 2016
12/20: Construction Nant de Drance May 2016
13/20: Construction Nant de Drance May 2016
14/20: Gas-insulated switching substation May 2016
15/20: Gas-insulated switching substation May 2016
16/20: Construction Nant de Drance July 2016
17/20: Construction Nant de Drance April 2017
18/20: Construction Nant de Drance April 2017
19/20: Construction Nant de Drance April 2017
20/20: Construction Nant de Drance May 2017

Project

Project update

The Nant de Drance pumped storage power plant connection project involves the construction of several 380 kV overhead and underground lines between Nant de Drance and Martigny in the Rhône valley, Swiss Federal Railways (SBB) 132 kV power lines between Châtelard and Vernayaz, and 220 kV lines between Châtelard and Vallorcine. When these new lines are commissioned, the current 132/220 kV line between Châtelard and Martigny in the Rhone valley will be dismantled. In the municipality of Salvan, the second SBB 132 kV power line will be rerouted to the Marécottes zoo and then buried up to Vernayaz.

General site plan Nant de Drance
General site plan Nant de Drance

Project stakeholders

Vertreter der wichtigsten Beteiligten am Projekt zum Anschluss des Kraftwerks Nant de Drance äussern sich zum Thema:

  • Eric Wuilloud, Director of the Nant de Drance power plant
  • Anne-Laure Couchepin Vouilloz, Mayor of Martigny
  • Florian Piasenta, Mayor of Salvan
  • Pascal May, Mayor of Finhaut
  • François Berger, Head of SBB Transmission Lines
Interviews with project stakeholders and visualisations
Interviews with project stakeholders and visualisations

People & environment

Landscape

The new 380 kV Châtelard – La Bâtiaz overhead line has been constructed in the Gorges du Trient at an altitude of 800 metres at the edge of the forest. It was brought into service in 2018, enabling the dismantling of the old 220 kV overhead line crossing the village of Salvan. Following the planned dismantling of the old 132 kV SBB overhead line, there will no longer be any overhead electrical line on the Salvan plateau, as the new SBB line will be buried from the lower part of Les Marécottes until Marcot.

The burying of the La Bâtiaz – Le Verney 1.3 km section will eventually enable the dismantling of the old line crossing the Rhone Valley between La Bâtiaz and Le Rosel.

Biodiversity

Revitalisation of dry grassland of high natural value in the Salvan municipality. This revitalisation encourages the proliferation of rare or endangered species of flowers.

Biotope

Creation of ponds in the Salvan municipality to encourage the development of amphibians such as the European common frog, common toad and Alpine newt.

Electromagnetic fields

The burden on the population will be reduced by the greater distance of the line to the settlements. The limit of 1 μT for electromagnetic radiation will be complied with across the board, with some areas reporting values well below this limit. The noise burden will be significantly reduced thanks to the use of the latest technologies and triple conductors.


Downloads

Construction of the 380 kV overhead line between Châtelard – La Bâtiaz (2015 - 2017)
Construction of the 380 kV overhead line between Châtelard – La Bâtiaz (2015 - 2017)

Grid news

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