Grid project Obfelden – Samstagern

Zurich’s municipal electricity utility (Elektrizitätswerk der Stadt Zürich – ewz) is planning to upgrade the existing lines between Obfelden, Waldegg and Samstagern from 150 kV to 380/220 kV. In addition, the traction current of 132 kV is to be partly bundled on the same line. These measures are necessary to increase the security of supply for the City of Zurich, the Thalwil region and the regional railway infrastructure. Upon completion of the project, the lines will become the property of Swissgrid.

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
380 kV underground cabling
380 kV underground cabling
Existing line
Existing line
Substation
Substation

Overview

The project provides for the upgrade and/or replacement of the existing 150-kV lines between the Obfelden substation, the planned Waldegg substation and the Samstagern substation by means of a 380-/220-kV line. The grid project will permanently improve the energy supply to the consumer centres of the City of Zurich and the Thalwil region. In future, the two substations at Thalwil and Waldegg will be redundantly connected to the Swiss transmission grid. Following the commissioning of the new line, the 110-kV line between Obfelden and Thalwil and the Samstagern substation will be dismantled.


Project

Schweikrüti (pylon 46) – Kilchberg section

After the Federal Supreme Court had sent the planning approval dossier for the Schweikrüti–Kilchberg section back to the Swiss Federal Office of Energy (SFOE), the latter mandated the construction of an overhead line. This line is to include Swissgrid’s 380-/220-kV line and the SBB’s 132-kV railway power line. As a compensatory measure, Axpo’s 110-kV line between Obfelden and Thalwil will be dismantled.

Kilchberg – Frohalp section

The SFOE has mandated that the Kilchberg – Frohalp cabled section be exempted from the sectoral plan process. The project is currently being further developed as part of the construction project. The planning approval dossier for submission to the Federal Inspectorate for Heavy Current Installations (ESTI) is in preparation.

Frohalp – Waldegg section

The Federal Council has defined the planning corridor for implementing an underground line in the sectoral plan process. The construction project is in preparation.

Teilabschnitt Waldegg – Obfelden

The preliminary project for the Waldegg–Obfelden section is in preparation.


Grid news

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  • | News

    Chamoson – Chippis: supplementary geological study

    In 2015, the cantonal geologist of the Valais requested an additional «natural hazards» study within the framework of the Chamoson – Chippis extra-high-voltage transmission line project.
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