Etzelwerk Altendorf
Etzelwerk Altendorf pumped hydro overview.
Etzelwerk is a pumped-storage power station at Altendorf that supplies electricity for Switzerland’s railways. It uses the height difference between the Sihlsee and Lake Zurich, with pumping available to return water to the upper reservoir. SBB is renewing the station and its water conveyance infrastructure while the existing plant remains in operation.In OperationSwitzerland
At a Glance
Capacity
135 MWEnergy storage
Data coming soonOperator
Data coming soonCountry
SwitzerlandLocation
47.194°, 8.811°Website
Official project pageOwnership
1 record| Share | Organisation | Role | Details | Period |
|---|---|---|---|---|
| Unknown | Owner Operator | SBB operates the Etzelwerk station and absorbed the assets and liabilities of Etzelwerk AG in the merger published on 11 June 2026. | Current / not dated |
Organisations
3 recordsOrganisations recorded as working on this asset or its project, and their role.
| Organisation | Role | Details |
|---|---|---|
| Former project companyOwnership History | Etzelwerk AG was the SBB subsidiary associated with the station. The June 2026 merger notice records transfer of its assets and liabilities to SBB. | |
| Station owner, operator and renewal sponsorOwner Operator | SBB operates Etzelwerk for railway electricity supply and is carrying out the renewal programme. It absorbed Etzelwerk AG’s assets and liabilities in 2026. | |
| Renewal surveying and condition recordingSurvey Inspection | Terradata’s 2025–2026 reference describes construction surveying, laser scanning and condition recording for the Etzelwerk renewal. |
Supplier registration
Developer supplier portalHow suppliers get onto this project's radar: its standing register, supplier portal or contact route.
Suppliers can introduce their products and services to SBB’s procurement team and take part in its published competitions. Supplier registration and qualification support the wider group’s purchasing activities.
SBB-wide supplier introduction, qualification and procurement arrangements; public competitions are published through SIMAP.
SourceChecked 29 Oct 2026